diff --git a/internal/checker/checker_test.go b/internal/checker/checker_test.go
index 2acdbb62da..c5029ecbc9 100644
--- a/internal/checker/checker_test.go
+++ b/internal/checker/checker_test.go
@@ -36,7 +36,7 @@ foo.bar;`
 	fs = bundled.WrapFS(fs)
 
 	cd := "/"
-	host := compiler.NewCompilerHost(cd, fs, bundled.LibPath(), nil)
+	host := compiler.NewCompilerHost(cd, fs, bundled.LibPath(), nil, nil)
 
 	parsed, errors := tsoptions.GetParsedCommandLineOfConfigFile("/tsconfig.json", &core.CompilerOptions{}, host, nil)
 	assert.Equal(t, len(errors), 0, "Expected no errors in parsed command line")
@@ -70,7 +70,7 @@ func TestCheckSrcCompiler(t *testing.T) {
 
 	rootPath := tspath.CombinePaths(tspath.NormalizeSlashes(repo.TypeScriptSubmodulePath), "src", "compiler")
 
-	host := compiler.NewCompilerHost(rootPath, fs, bundled.LibPath(), nil)
+	host := compiler.NewCompilerHost(rootPath, fs, bundled.LibPath(), nil, nil)
 	parsed, errors := tsoptions.GetParsedCommandLineOfConfigFile(tspath.CombinePaths(rootPath, "tsconfig.json"), &core.CompilerOptions{}, host, nil)
 	assert.Equal(t, len(errors), 0, "Expected no errors in parsed command line")
 	p := compiler.NewProgram(compiler.ProgramOptions{
@@ -87,7 +87,7 @@ func BenchmarkNewChecker(b *testing.B) {
 
 	rootPath := tspath.CombinePaths(tspath.NormalizeSlashes(repo.TypeScriptSubmodulePath), "src", "compiler")
 
-	host := compiler.NewCompilerHost(rootPath, fs, bundled.LibPath(), nil)
+	host := compiler.NewCompilerHost(rootPath, fs, bundled.LibPath(), nil, nil)
 	parsed, errors := tsoptions.GetParsedCommandLineOfConfigFile(tspath.CombinePaths(rootPath, "tsconfig.json"), &core.CompilerOptions{}, host, nil)
 	assert.Equal(b, len(errors), 0, "Expected no errors in parsed command line")
 	p := compiler.NewProgram(compiler.ProgramOptions{
diff --git a/internal/compiler/fileloader.go b/internal/compiler/fileloader.go
index fbb96adf93..1d8a8a4919 100644
--- a/internal/compiler/fileloader.go
+++ b/internal/compiler/fileloader.go
@@ -15,6 +15,12 @@ import (
 	"github.com/microsoft/typescript-go/internal/tspath"
 )
 
+type libResolution struct {
+	libraryName string
+	resolution  *module.ResolvedModule
+	trace       []string
+}
+
 type fileLoader struct {
 	opts                ProgramOptions
 	resolver            *module.Resolver
@@ -35,7 +41,7 @@ type fileLoader struct {
 	dtsDirectories             collections.Set[tspath.Path]
 
 	pathForLibFileCache       collections.SyncMap[string, string]
-	pathForLibFileResolutions collections.SyncMap[tspath.Path, module.ModeAwareCache[*module.ResolvedModule]]
+	pathForLibFileResolutions collections.SyncMap[tspath.Path, *libResolution]
 }
 
 type processedFiles struct {
@@ -200,15 +206,20 @@ func processAllProgramFiles(
 		}
 	}
 
-	loader.pathForLibFileResolutions.Range(func(key tspath.Path, value module.ModeAwareCache[*module.ResolvedModule]) bool {
-		resolvedModules[key] = value
-		for _, resolvedModule := range value {
-			for _, diag := range resolvedModule.ResolutionDiagnostics {
-				fileLoadDiagnostics.Add(diag)
-			}
+	keys := slices.Collect(loader.pathForLibFileResolutions.Keys())
+	slices.Sort(keys)
+	for _, key := range keys {
+		value, _ := loader.pathForLibFileResolutions.Load(key)
+		resolvedModules[key] = module.ModeAwareCache[*module.ResolvedModule]{
+			module.ModeAwareCacheKey{Name: value.libraryName, Mode: core.ModuleKindCommonJS}: value.resolution,
 		}
-		return true
-	})
+		for _, trace := range value.trace {
+			opts.Host.Trace(trace)
+		}
+		for _, diag := range value.resolution.ResolutionDiagnostics {
+			fileLoadDiagnostics.Add(diag)
+		}
+	}
 
 	return processedFiles{
 		resolver:                             loader.resolver,
@@ -255,6 +266,7 @@ func (p *fileLoader) addAutomaticTypeDirectiveTasks() {
 func (p *fileLoader) resolveAutomaticTypeDirectives(containingFileName string) (
 	toParse []resolvedRef,
 	typeResolutionsInFile module.ModeAwareCache[*module.ResolvedTypeReferenceDirective],
+	typeResolutionsTrace []string,
 ) {
 	automaticTypeDirectiveNames := module.GetAutomaticTypeDirectiveNames(p.opts.Config.CompilerOptions(), p.opts.Host)
 	if len(automaticTypeDirectiveNames) != 0 {
@@ -262,8 +274,9 @@ func (p *fileLoader) resolveAutomaticTypeDirectives(containingFileName string) (
 		typeResolutionsInFile = make(module.ModeAwareCache[*module.ResolvedTypeReferenceDirective], len(automaticTypeDirectiveNames))
 		for _, name := range automaticTypeDirectiveNames {
 			resolutionMode := core.ModuleKindNodeNext
-			resolved := p.resolver.ResolveTypeReferenceDirective(name, containingFileName, resolutionMode, nil)
+			resolved, trace := p.resolver.ResolveTypeReferenceDirective(name, containingFileName, resolutionMode, nil)
 			typeResolutionsInFile[module.ModeAwareCacheKey{Name: name, Mode: resolutionMode}] = resolved
+			typeResolutionsTrace = append(typeResolutionsTrace, trace...)
 			if resolved.IsResolved() {
 				toParse = append(toParse, resolvedRef{
 					fileName:      resolved.ResolvedFileName,
@@ -273,7 +286,7 @@ func (p *fileLoader) resolveAutomaticTypeDirectives(containingFileName string) (
 			}
 		}
 	}
-	return toParse, typeResolutionsInFile
+	return toParse, typeResolutionsInFile, typeResolutionsTrace
 }
 
 func (p *fileLoader) addProjectReferenceTasks(singleThreaded bool) {
@@ -393,11 +406,13 @@ func (p *fileLoader) resolveTypeReferenceDirectives(t *parseTask) {
 	meta := t.metadata
 
 	typeResolutionsInFile := make(module.ModeAwareCache[*module.ResolvedTypeReferenceDirective], len(file.TypeReferenceDirectives))
+	var typeResolutionsTrace []string
 	for _, ref := range file.TypeReferenceDirectives {
 		redirect := p.projectReferenceFileMapper.getRedirectForResolution(file)
 		resolutionMode := getModeForTypeReferenceDirectiveInFile(ref, file, meta, module.GetCompilerOptionsWithRedirect(p.opts.Config.CompilerOptions(), redirect))
-		resolved := p.resolver.ResolveTypeReferenceDirective(ref.FileName, file.FileName(), resolutionMode, redirect)
+		resolved, trace := p.resolver.ResolveTypeReferenceDirective(ref.FileName, file.FileName(), resolutionMode, redirect)
 		typeResolutionsInFile[module.ModeAwareCacheKey{Name: ref.FileName, Mode: resolutionMode}] = resolved
+		typeResolutionsTrace = append(typeResolutionsTrace, trace...)
 
 		if resolved.IsResolved() {
 			t.addSubTask(resolvedRef{
@@ -410,6 +425,7 @@ func (p *fileLoader) resolveTypeReferenceDirectives(t *parseTask) {
 	}
 
 	t.typeResolutionsInFile = typeResolutionsInFile
+	t.typeResolutionsTrace = typeResolutionsTrace
 }
 
 const externalHelpersModuleNameText = "tslib" // TODO(jakebailey): dedupe
@@ -455,6 +471,7 @@ func (p *fileLoader) resolveImportsAndModuleAugmentations(t *parseTask) {
 
 	if len(moduleNames) != 0 {
 		resolutionsInFile := make(module.ModeAwareCache[*module.ResolvedModule], len(moduleNames))
+		var resolutionsTrace []string
 
 		for index, entry := range moduleNames {
 			moduleName := entry.Text()
@@ -463,8 +480,9 @@ func (p *fileLoader) resolveImportsAndModuleAugmentations(t *parseTask) {
 			}
 
 			mode := getModeForUsageLocation(file.FileName(), meta, entry, optionsForFile)
-			resolvedModule := p.resolver.ResolveModuleName(moduleName, file.FileName(), mode, redirect)
+			resolvedModule, trace := p.resolver.ResolveModuleName(moduleName, file.FileName(), mode, redirect)
 			resolutionsInFile[module.ModeAwareCacheKey{Name: moduleName, Mode: mode}] = resolvedModule
+			resolutionsTrace = append(resolutionsTrace, trace...)
 
 			if !resolvedModule.IsResolved() {
 				continue
@@ -501,6 +519,7 @@ func (p *fileLoader) resolveImportsAndModuleAugmentations(t *parseTask) {
 		}
 
 		t.resolutionsInFile = resolutionsInFile
+		t.resolutionsTrace = resolutionsTrace
 	}
 }
 
@@ -526,11 +545,13 @@ func (p *fileLoader) pathForLibFile(name string) string {
 	if p.opts.Config.CompilerOptions().LibReplacement.IsTrue() {
 		libraryName := getLibraryNameFromLibFileName(name)
 		resolveFrom := getInferredLibraryNameResolveFrom(p.opts.Config.CompilerOptions(), p.opts.Host.GetCurrentDirectory(), name)
-		resolution := p.resolver.ResolveModuleName(libraryName, resolveFrom, core.ModuleKindCommonJS, nil)
+		resolution, trace := p.resolver.ResolveModuleName(libraryName, resolveFrom, core.ModuleKindCommonJS, nil)
 		if resolution.IsResolved() {
 			path = resolution.ResolvedFileName
-			p.pathForLibFileResolutions.LoadOrStore(p.toPath(resolveFrom), module.ModeAwareCache[*module.ResolvedModule]{
-				module.ModeAwareCacheKey{Name: libraryName, Mode: core.ModuleKindCommonJS}: resolution,
+			p.pathForLibFileResolutions.LoadOrStore(p.toPath(resolveFrom), &libResolution{
+				libraryName: libraryName,
+				resolution:  resolution,
+				trace:       trace,
 			})
 		}
 	}
diff --git a/internal/compiler/filesparser.go b/internal/compiler/filesparser.go
index de3f2994c3..36ce3910b5 100644
--- a/internal/compiler/filesparser.go
+++ b/internal/compiler/filesparser.go
@@ -25,7 +25,9 @@ type parseTask struct {
 
 	metadata                     ast.SourceFileMetaData
 	resolutionsInFile            module.ModeAwareCache[*module.ResolvedModule]
+	resolutionsTrace             []string
 	typeResolutionsInFile        module.ModeAwareCache[*module.ResolvedTypeReferenceDirective]
+	typeResolutionsTrace         []string
 	resolutionDiagnostics        []*ast.Diagnostic
 	importHelpersImportSpecifier *ast.Node
 	jsxRuntimeImportSpecifier    *jsxRuntimeImportSpecifier
@@ -98,8 +100,9 @@ func (t *parseTask) redirect(loader *fileLoader, fileName string) {
 }
 
 func (t *parseTask) loadAutomaticTypeDirectives(loader *fileLoader) {
-	toParseTypeRefs, typeResolutionsInFile := loader.resolveAutomaticTypeDirectives(t.normalizedFilePath)
+	toParseTypeRefs, typeResolutionsInFile, typeResolutionsTrace := loader.resolveAutomaticTypeDirectives(t.normalizedFilePath)
 	t.typeResolutionsInFile = typeResolutionsInFile
+	t.typeResolutionsTrace = typeResolutionsTrace
 	for _, typeResolution := range toParseTypeRefs {
 		t.addSubTask(typeResolution, false)
 	}
@@ -193,7 +196,7 @@ func (w *filesParser) start(loader *fileLoader, tasks []*parseTask, depth int, i
 	}
 }
 
-func (w *filesParser) collect(loader *fileLoader, tasks []*parseTask, iterate func(*parseTask)) []tspath.Path {
+func (w *filesParser) collect(loader *fileLoader, tasks []*parseTask, iterate func(*parseTask)) {
 	// Mark all tasks we saw as external after the fact.
 	w.tasksByFileName.Range(func(key string, value *queuedParseTask) bool {
 		if value.fromExternalLibrary {
@@ -201,22 +204,24 @@ func (w *filesParser) collect(loader *fileLoader, tasks []*parseTask, iterate fu
 		}
 		return true
 	})
-	return w.collectWorker(loader, tasks, iterate, collections.Set[*parseTask]{})
+	w.collectWorker(loader, tasks, iterate, collections.Set[*parseTask]{})
 }
 
-func (w *filesParser) collectWorker(loader *fileLoader, tasks []*parseTask, iterate func(*parseTask), seen collections.Set[*parseTask]) []tspath.Path {
-	var results []tspath.Path
+func (w *filesParser) collectWorker(loader *fileLoader, tasks []*parseTask, iterate func(*parseTask), seen collections.Set[*parseTask]) {
 	for _, task := range tasks {
 		// ensure we only walk each task once
-		if !task.loaded || seen.Has(task) {
+		if !task.loaded || !seen.AddIfAbsent(task) {
 			continue
 		}
-		seen.Add(task)
+		for _, trace := range task.typeResolutionsTrace {
+			loader.opts.Host.Trace(trace)
+		}
+		for _, trace := range task.resolutionsTrace {
+			loader.opts.Host.Trace(trace)
+		}
 		if subTasks := task.subTasks; len(subTasks) > 0 {
 			w.collectWorker(loader, subTasks, iterate, seen)
 		}
 		iterate(task)
-		results = append(results, loader.toPath(task.FileName()))
 	}
-	return results
 }
diff --git a/internal/compiler/host.go b/internal/compiler/host.go
index d4968bd760..9221e59b45 100644
--- a/internal/compiler/host.go
+++ b/internal/compiler/host.go
@@ -30,6 +30,7 @@ type compilerHost struct {
 	defaultLibraryPath      string
 	extendedConfigCache     *collections.SyncMap[tspath.Path, *tsoptions.ExtendedConfigCacheEntry]
 	extendedConfigCacheOnce sync.Once
+	trace                   func(msg string)
 }
 
 func NewCachedFSCompilerHost(
@@ -37,8 +38,9 @@ func NewCachedFSCompilerHost(
 	fs vfs.FS,
 	defaultLibraryPath string,
 	extendedConfigCache *collections.SyncMap[tspath.Path, *tsoptions.ExtendedConfigCacheEntry],
+	trace func(msg string),
 ) CompilerHost {
-	return NewCompilerHost(currentDirectory, cachedvfs.From(fs), defaultLibraryPath, extendedConfigCache)
+	return NewCompilerHost(currentDirectory, cachedvfs.From(fs), defaultLibraryPath, extendedConfigCache, trace)
 }
 
 func NewCompilerHost(
@@ -46,12 +48,17 @@ func NewCompilerHost(
 	fs vfs.FS,
 	defaultLibraryPath string,
 	extendedConfigCache *collections.SyncMap[tspath.Path, *tsoptions.ExtendedConfigCacheEntry],
+	trace func(msg string),
 ) CompilerHost {
+	if trace == nil {
+		trace = func(msg string) {}
+	}
 	return &compilerHost{
 		currentDirectory:    currentDirectory,
 		fs:                  fs,
 		defaultLibraryPath:  defaultLibraryPath,
 		extendedConfigCache: extendedConfigCache,
+		trace:               trace,
 	}
 }
 
@@ -68,7 +75,7 @@ func (h *compilerHost) GetCurrentDirectory() string {
 }
 
 func (h *compilerHost) Trace(msg string) {
-	//!!! TODO: implement
+	h.trace(msg)
 }
 
 func (h *compilerHost) GetSourceFile(opts ast.SourceFileParseOptions) *ast.SourceFile {
diff --git a/internal/compiler/program_test.go b/internal/compiler/program_test.go
index e6350e8375..7c23992fdf 100644
--- a/internal/compiler/program_test.go
+++ b/internal/compiler/program_test.go
@@ -1,4 +1,4 @@
-package compiler
+package compiler_test
 
 import (
 	"path/filepath"
@@ -7,6 +7,7 @@ import (
 	"testing"
 
 	"github.com/microsoft/typescript-go/internal/bundled"
+	"github.com/microsoft/typescript-go/internal/compiler"
 	"github.com/microsoft/typescript-go/internal/core"
 	"github.com/microsoft/typescript-go/internal/repo"
 	"github.com/microsoft/typescript-go/internal/tsoptions"
@@ -233,14 +234,14 @@ func TestProgram(t *testing.T) {
 
 			opts := core.CompilerOptions{Target: testCase.target}
 
-			program := NewProgram(ProgramOptions{
+			program := compiler.NewProgram(compiler.ProgramOptions{
 				Config: &tsoptions.ParsedCommandLine{
 					ParsedConfig: &core.ParsedOptions{
 						FileNames:       []string{"c:/dev/src/index.ts"},
 						CompilerOptions: &opts,
 					},
 				},
-				Host: NewCompilerHost("c:/dev/src", fs, bundled.LibPath(), nil),
+				Host: compiler.NewCompilerHost("c:/dev/src", fs, bundled.LibPath(), nil, nil),
 			})
 
 			actualFiles := []string{}
@@ -270,18 +271,18 @@ func BenchmarkNewProgram(b *testing.B) {
 			}
 
 			opts := core.CompilerOptions{Target: testCase.target}
-			programOpts := ProgramOptions{
+			programOpts := compiler.ProgramOptions{
 				Config: &tsoptions.ParsedCommandLine{
 					ParsedConfig: &core.ParsedOptions{
 						FileNames:       []string{"c:/dev/src/index.ts"},
 						CompilerOptions: &opts,
 					},
 				},
-				Host: NewCompilerHost("c:/dev/src", fs, bundled.LibPath(), nil),
+				Host: compiler.NewCompilerHost("c:/dev/src", fs, bundled.LibPath(), nil, nil),
 			}
 
 			for b.Loop() {
-				NewProgram(programOpts)
+				compiler.NewProgram(programOpts)
 			}
 		})
 	}
@@ -294,18 +295,18 @@ func BenchmarkNewProgram(b *testing.B) {
 		fs := osvfs.FS()
 		fs = bundled.WrapFS(fs)
 
-		host := NewCompilerHost(rootPath, fs, bundled.LibPath(), nil)
+		host := compiler.NewCompilerHost(rootPath, fs, bundled.LibPath(), nil, nil)
 
 		parsed, errors := tsoptions.GetParsedCommandLineOfConfigFile(tspath.CombinePaths(rootPath, "tsconfig.json"), nil, host, nil)
 		assert.Equal(b, len(errors), 0, "Expected no errors in parsed command line")
 
-		opts := ProgramOptions{
+		opts := compiler.ProgramOptions{
 			Config: parsed,
 			Host:   host,
 		}
 
 		for b.Loop() {
-			NewProgram(opts)
+			compiler.NewProgram(opts)
 		}
 	})
 }
diff --git a/internal/compiler/projectreferencedtsfakinghost.go b/internal/compiler/projectreferencedtsfakinghost.go
index 9c03e8414f..3bac411dad 100644
--- a/internal/compiler/projectreferencedtsfakinghost.go
+++ b/internal/compiler/projectreferencedtsfakinghost.go
@@ -41,11 +41,6 @@ func (h *projectReferenceDtsFakingHost) GetCurrentDirectory() string {
 	return h.host.GetCurrentDirectory()
 }
 
-// Trace implements module.ResolutionHost.
-func (h *projectReferenceDtsFakingHost) Trace(msg string) {
-	h.host.Trace(msg)
-}
-
 type projectReferenceDtsFakingVfs struct {
 	projectReferenceFileMapper *projectReferenceFileMapper
 	dtsDirectories             collections.Set[tspath.Path]
diff --git a/internal/execute/tsc.go b/internal/execute/tsc.go
index af97431c32..8d486f7604 100644
--- a/internal/execute/tsc.go
+++ b/internal/execute/tsc.go
@@ -223,6 +223,12 @@ func findConfigFile(searchPath string, fileExists func(string) bool, configName
 	return result
 }
 
+func getTraceFromSys(sys System) func(msg string) {
+	return func(msg string) {
+		fmt.Fprintln(sys.Writer(), msg)
+	}
+}
+
 func performIncrementalCompilation(
 	sys System,
 	config *tsoptions.ParsedCommandLine,
@@ -231,7 +237,7 @@ func performIncrementalCompilation(
 	configTime time.Duration,
 	testing bool,
 ) CommandLineResult {
-	host := compiler.NewCachedFSCompilerHost(sys.GetCurrentDirectory(), sys.FS(), sys.DefaultLibraryPath(), extendedConfigCache)
+	host := compiler.NewCachedFSCompilerHost(sys.GetCurrentDirectory(), sys.FS(), sys.DefaultLibraryPath(), extendedConfigCache, getTraceFromSys(sys))
 	buildInfoReadStart := sys.Now()
 	oldProgram := incremental.ReadBuildInfoProgram(config, incremental.NewBuildInfoReader(host))
 	buildInfoReadTime := sys.Now().Sub(buildInfoReadStart)
@@ -270,7 +276,7 @@ func performCompilation(
 	extendedConfigCache *collections.SyncMap[tspath.Path, *tsoptions.ExtendedConfigCacheEntry],
 	configTime time.Duration,
 ) CommandLineResult {
-	host := compiler.NewCachedFSCompilerHost(sys.GetCurrentDirectory(), sys.FS(), sys.DefaultLibraryPath(), extendedConfigCache)
+	host := compiler.NewCachedFSCompilerHost(sys.GetCurrentDirectory(), sys.FS(), sys.DefaultLibraryPath(), extendedConfigCache, getTraceFromSys(sys))
 	// todo: cache, statistics, tracing
 	parseStart := sys.Now()
 	program := compiler.NewProgram(compiler.ProgramOptions{
diff --git a/internal/execute/watcher.go b/internal/execute/watcher.go
index 223bdc73fc..9190a599f1 100644
--- a/internal/execute/watcher.go
+++ b/internal/execute/watcher.go
@@ -42,7 +42,7 @@ func createWatcher(sys System, configParseResult *tsoptions.ParsedCommandLine, r
 }
 
 func (w *Watcher) start() {
-	w.host = compiler.NewCompilerHost(w.sys.GetCurrentDirectory(), w.sys.FS(), w.sys.DefaultLibraryPath(), nil)
+	w.host = compiler.NewCompilerHost(w.sys.GetCurrentDirectory(), w.sys.FS(), w.sys.DefaultLibraryPath(), nil, getTraceFromSys(w.sys))
 	w.program = incremental.ReadBuildInfoProgram(w.options, incremental.NewBuildInfoReader(w.host))
 
 	if !w.testing {
@@ -109,7 +109,7 @@ func (w *Watcher) hasErrorsInTsConfig() bool {
 			w.configModified = true
 		}
 		w.options = configParseResult
-		w.host = compiler.NewCompilerHost(w.sys.GetCurrentDirectory(), w.sys.FS(), w.sys.DefaultLibraryPath(), &extendedConfigCache)
+		w.host = compiler.NewCompilerHost(w.sys.GetCurrentDirectory(), w.sys.FS(), w.sys.DefaultLibraryPath(), &extendedConfigCache, getTraceFromSys(w.sys))
 	}
 	return false
 }
diff --git a/internal/module/resolver.go b/internal/module/resolver.go
index 6071d8535a..45f8a8523c 100644
--- a/internal/module/resolver.go
+++ b/internal/module/resolver.go
@@ -40,8 +40,26 @@ func unresolved() *resolved {
 
 type resolutionKindSpecificLoader = func(extensions extensions, candidate string, onlyRecordFailures bool) *resolved
 
+type tracer struct {
+	traces []string
+}
+
+func (t *tracer) write(msg string) {
+	if t != nil {
+		t.traces = append(t.traces, msg)
+	}
+}
+
+func (t *tracer) getTraces() []string {
+	if t != nil {
+		return t.traces
+	}
+	return nil
+}
+
 type resolutionState struct {
 	resolver *Resolver
+	tracer   *tracer
 
 	// request fields
 	name                string
@@ -69,12 +87,14 @@ func newResolutionState(
 	compilerOptions *core.CompilerOptions,
 	redirectedReference ResolvedProjectReference,
 	resolver *Resolver,
+	traceBuilder *tracer,
 ) *resolutionState {
 	state := &resolutionState{
 		name:                name,
 		containingDirectory: containingDirectory,
 		compilerOptions:     GetCompilerOptionsWithRedirect(compilerOptions, redirectedReference),
 		resolver:            resolver,
+		tracer:              traceBuilder,
 	}
 
 	if isTypeReferenceDirective {
@@ -139,8 +159,11 @@ func NewResolver(
 	}
 }
 
-func (r *Resolver) traceEnabled() bool {
-	return r.compilerOptions.TraceResolution == core.TSTrue
+func (r *Resolver) newTraceBuilder() *tracer {
+	if r.compilerOptions.TraceResolution == core.TSTrue {
+		return &tracer{}
+	}
+	return nil
 }
 
 func (r *Resolver) GetPackageScopeForPath(directory string) *packagejson.InfoCacheEntry {
@@ -160,9 +183,9 @@ func (r *Resolver) GetPackageJsonScopeIfApplicable(path string) *packagejson.Inf
 	return nil
 }
 
-func (r *Resolver) traceResolutionUsingProjectReference(redirectedReference ResolvedProjectReference) {
+func (r *tracer) traceResolutionUsingProjectReference(redirectedReference ResolvedProjectReference) {
 	if redirectedReference != nil && redirectedReference.CompilerOptions() != nil {
-		r.host.Trace(diagnostics.Using_compiler_options_of_project_reference_redirect_0.Format(redirectedReference.ConfigName()))
+		r.write(diagnostics.Using_compiler_options_of_project_reference_redirect_0.Format(redirectedReference.ConfigName()))
 	}
 }
 
@@ -171,73 +194,73 @@ func (r *Resolver) ResolveTypeReferenceDirective(
 	containingFile string,
 	resolutionMode core.ResolutionMode,
 	redirectedReference ResolvedProjectReference,
-) *ResolvedTypeReferenceDirective {
-	traceEnabled := r.traceEnabled()
+) (*ResolvedTypeReferenceDirective, []string) {
+	traceBuilder := r.newTraceBuilder()
 
 	compilerOptions := GetCompilerOptionsWithRedirect(r.compilerOptions, redirectedReference)
 	containingDirectory := tspath.GetDirectoryPath(containingFile)
 
 	typeRoots, fromConfig := compilerOptions.GetEffectiveTypeRoots(r.host.GetCurrentDirectory())
-	if traceEnabled {
-		r.host.Trace(diagnostics.Resolving_type_reference_directive_0_containing_file_1_root_directory_2.Format(typeReferenceDirectiveName, containingFile, strings.Join(typeRoots, ",")))
-		r.traceResolutionUsingProjectReference(redirectedReference)
+	if traceBuilder != nil {
+		traceBuilder.write(diagnostics.Resolving_type_reference_directive_0_containing_file_1_root_directory_2.Format(typeReferenceDirectiveName, containingFile, strings.Join(typeRoots, ",")))
+		traceBuilder.traceResolutionUsingProjectReference(redirectedReference)
 	}
 
-	state := newResolutionState(typeReferenceDirectiveName, containingDirectory, true /*isTypeReferenceDirective*/, resolutionMode, compilerOptions, redirectedReference, r)
+	state := newResolutionState(typeReferenceDirectiveName, containingDirectory, true /*isTypeReferenceDirective*/, resolutionMode, compilerOptions, redirectedReference, r, traceBuilder)
 	result := state.resolveTypeReferenceDirective(typeRoots, fromConfig, strings.HasSuffix(containingFile, InferredTypesContainingFile))
 
-	if traceEnabled {
-		r.traceTypeReferenceDirectiveResult(typeReferenceDirectiveName, result)
+	if traceBuilder != nil {
+		traceBuilder.traceTypeReferenceDirectiveResult(typeReferenceDirectiveName, result)
 	}
-	return result
+	return result, traceBuilder.getTraces()
 }
 
-func (r *Resolver) ResolveModuleName(moduleName string, containingFile string, resolutionMode core.ResolutionMode, redirectedReference ResolvedProjectReference) *ResolvedModule {
-	traceEnabled := r.traceEnabled()
+func (r *Resolver) ResolveModuleName(moduleName string, containingFile string, resolutionMode core.ResolutionMode, redirectedReference ResolvedProjectReference) (*ResolvedModule, []string) {
+	traceBuilder := r.newTraceBuilder()
 	compilerOptions := GetCompilerOptionsWithRedirect(r.compilerOptions, redirectedReference)
-	if traceEnabled {
-		r.host.Trace(diagnostics.Resolving_module_0_from_1.Format(moduleName, containingFile))
-		r.traceResolutionUsingProjectReference(redirectedReference)
+	if traceBuilder != nil {
+		traceBuilder.write(diagnostics.Resolving_module_0_from_1.Format(moduleName, containingFile))
+		traceBuilder.traceResolutionUsingProjectReference(redirectedReference)
 	}
 	containingDirectory := tspath.GetDirectoryPath(containingFile)
 
 	moduleResolution := compilerOptions.ModuleResolution
 	if moduleResolution == core.ModuleResolutionKindUnknown {
 		moduleResolution = compilerOptions.GetModuleResolutionKind()
-		if traceEnabled {
-			r.host.Trace(diagnostics.Module_resolution_kind_is_not_specified_using_0.Format(moduleResolution.String()))
+		if traceBuilder != nil {
+			traceBuilder.write(diagnostics.Module_resolution_kind_is_not_specified_using_0.Format(moduleResolution.String()))
 		}
 	} else {
-		if traceEnabled {
-			r.host.Trace(diagnostics.Explicitly_specified_module_resolution_kind_Colon_0.Format(moduleResolution.String()))
+		if traceBuilder != nil {
+			traceBuilder.write(diagnostics.Explicitly_specified_module_resolution_kind_Colon_0.Format(moduleResolution.String()))
 		}
 	}
 
 	var result *ResolvedModule
 	switch moduleResolution {
 	case core.ModuleResolutionKindNode16, core.ModuleResolutionKindNodeNext, core.ModuleResolutionKindBundler:
-		state := newResolutionState(moduleName, containingDirectory, false /*isTypeReferenceDirective*/, resolutionMode, compilerOptions, redirectedReference, r)
+		state := newResolutionState(moduleName, containingDirectory, false /*isTypeReferenceDirective*/, resolutionMode, compilerOptions, redirectedReference, r, traceBuilder)
 		result = state.resolveNodeLike()
 	default:
 		panic(fmt.Sprintf("Unexpected moduleResolution: %d", moduleResolution))
 	}
 
-	if traceEnabled {
+	if traceBuilder != nil {
 		if result.IsResolved() {
 			if result.PackageId.Name != "" {
-				r.host.Trace(diagnostics.Module_name_0_was_successfully_resolved_to_1_with_Package_ID_2.Format(moduleName, result.ResolvedFileName, result.PackageId.String()))
+				traceBuilder.write(diagnostics.Module_name_0_was_successfully_resolved_to_1_with_Package_ID_2.Format(moduleName, result.ResolvedFileName, result.PackageId.String()))
 			} else {
-				r.host.Trace(diagnostics.Module_name_0_was_successfully_resolved_to_1.Format(moduleName, result.ResolvedFileName))
+				traceBuilder.write(diagnostics.Module_name_0_was_successfully_resolved_to_1.Format(moduleName, result.ResolvedFileName))
 			}
 		} else {
-			r.host.Trace(diagnostics.Module_name_0_was_not_resolved.Format(moduleName))
+			traceBuilder.write(diagnostics.Module_name_0_was_not_resolved.Format(moduleName))
 		}
 	}
 
-	return r.tryResolveFromTypingsLocation(moduleName, containingDirectory, result)
+	return r.tryResolveFromTypingsLocation(moduleName, containingDirectory, result, traceBuilder), traceBuilder.getTraces()
 }
 
-func (r *Resolver) tryResolveFromTypingsLocation(moduleName string, containingDirectory string, originalResult *ResolvedModule) *ResolvedModule {
+func (r *Resolver) tryResolveFromTypingsLocation(moduleName string, containingDirectory string, originalResult *ResolvedModule, traceBuilder *tracer) *ResolvedModule {
 	if r.typingsLocation == "" ||
 		tspath.IsExternalModuleNameRelative(moduleName) ||
 		(originalResult.ResolvedFileName != "" && tspath.ExtensionIsOneOf(originalResult.Extension, tspath.SupportedTSExtensionsWithJsonFlat)) {
@@ -252,9 +275,10 @@ func (r *Resolver) tryResolveFromTypingsLocation(moduleName string, containingDi
 		r.compilerOptions,
 		nil, // redirectedReference,
 		r,
+		traceBuilder,
 	)
-	if r.traceEnabled() {
-		r.host.Trace(diagnostics.Auto_discovery_for_typings_is_enabled_in_project_0_Running_extra_resolution_pass_for_module_1_using_cache_location_2.Format(r.projectName, moduleName, r.typingsLocation))
+	if traceBuilder != nil {
+		traceBuilder.write(diagnostics.Auto_discovery_for_typings_is_enabled_in_project_0_Running_extra_resolution_pass_for_module_1_using_cache_location_2.Format(r.projectName, moduleName, r.typingsLocation))
 	}
 	globalResolved := state.loadModuleFromImmediateNodeModulesDirectory(extensionsDeclaration, r.typingsLocation, false)
 	if globalResolved == nil {
@@ -269,24 +293,24 @@ func (r *Resolver) tryResolveFromTypingsLocation(moduleName string, containingDi
 
 func (r *Resolver) resolveConfig(moduleName string, containingFile string) *ResolvedModule {
 	containingDirectory := tspath.GetDirectoryPath(containingFile)
-	state := newResolutionState(moduleName, containingDirectory, false /*isTypeReferenceDirective*/, core.ModuleKindCommonJS, r.compilerOptions, nil, r)
+	state := newResolutionState(moduleName, containingDirectory, false /*isTypeReferenceDirective*/, core.ModuleKindCommonJS, r.compilerOptions, nil, r, nil)
 	state.isConfigLookup = true
 	state.extensions = extensionsJson
 	return state.resolveNodeLike()
 }
 
-func (r *Resolver) traceTypeReferenceDirectiveResult(typeReferenceDirectiveName string, result *ResolvedTypeReferenceDirective) {
+func (r *tracer) traceTypeReferenceDirectiveResult(typeReferenceDirectiveName string, result *ResolvedTypeReferenceDirective) {
 	if !result.IsResolved() {
-		r.host.Trace(diagnostics.Type_reference_directive_0_was_not_resolved.Format(typeReferenceDirectiveName))
+		r.write(diagnostics.Type_reference_directive_0_was_not_resolved.Format(typeReferenceDirectiveName))
 	} else if result.PackageId.Name != "" {
-		r.host.Trace(diagnostics.Type_reference_directive_0_was_successfully_resolved_to_1_with_Package_ID_2_primary_Colon_3.Format(
+		r.write(diagnostics.Type_reference_directive_0_was_successfully_resolved_to_1_with_Package_ID_2_primary_Colon_3.Format(
 			typeReferenceDirectiveName,
 			result.ResolvedFileName,
 			result.PackageId.String(),
 			result.Primary,
 		))
 	} else {
-		r.host.Trace(diagnostics.Type_reference_directive_0_was_successfully_resolved_to_1_primary_Colon_2.Format(
+		r.write(diagnostics.Type_reference_directive_0_was_successfully_resolved_to_1_primary_Colon_2.Format(
 			typeReferenceDirectiveName,
 			result.ResolvedFileName,
 			result.Primary,
@@ -297,14 +321,14 @@ func (r *Resolver) traceTypeReferenceDirectiveResult(typeReferenceDirectiveName
 func (r *resolutionState) resolveTypeReferenceDirective(typeRoots []string, fromConfig bool, fromInferredTypesContainingFile bool) *ResolvedTypeReferenceDirective {
 	// Primary lookup
 	if len(typeRoots) > 0 {
-		if r.resolver.traceEnabled() {
-			r.resolver.host.Trace(diagnostics.Resolving_with_primary_search_path_0.Format(strings.Join(typeRoots, ", ")))
+		if r.tracer != nil {
+			r.tracer.write(diagnostics.Resolving_with_primary_search_path_0.Format(strings.Join(typeRoots, ", ")))
 		}
 		for _, typeRoot := range typeRoots {
 			candidate := r.getCandidateFromTypeRoot(typeRoot)
 			directoryExists := r.resolver.host.FS().DirectoryExists(candidate)
-			if !directoryExists && r.resolver.traceEnabled() {
-				r.resolver.host.Trace(diagnostics.Directory_0_does_not_exist_skipping_all_lookups_in_it.Format(typeRoot))
+			if !directoryExists && r.tracer != nil {
+				r.tracer.write(diagnostics.Directory_0_does_not_exist_skipping_all_lookups_in_it.Format(typeRoot))
 			}
 			if fromConfig {
 				// Custom typeRoots resolve as file or directory just like we do modules
@@ -320,15 +344,15 @@ func (r *resolutionState) resolveTypeReferenceDirective(typeRoots []string, from
 				return r.createResolvedTypeReferenceDirective(resolvedFromDirectory, true /*primary*/)
 			}
 		}
-	} else if r.resolver.traceEnabled() {
-		r.resolver.host.Trace(diagnostics.Root_directory_cannot_be_determined_skipping_primary_search_paths.Format())
+	} else if r.tracer != nil {
+		r.tracer.write(diagnostics.Root_directory_cannot_be_determined_skipping_primary_search_paths.Format())
 	}
 
 	// Secondary lookup
 	var resolved *resolved
 	if !fromConfig || !fromInferredTypesContainingFile {
-		if r.resolver.traceEnabled() {
-			r.resolver.host.Trace(diagnostics.Looking_up_in_node_modules_folder_initial_location_0.Format(r.containingDirectory))
+		if r.tracer != nil {
+			r.tracer.write(diagnostics.Looking_up_in_node_modules_folder_initial_location_0.Format(r.containingDirectory))
 		}
 		if !tspath.IsExternalModuleNameRelative(r.name) {
 			resolved = r.loadModuleFromNearestNodeModulesDirectory(false /*typesScopeOnly*/)
@@ -336,8 +360,8 @@ func (r *resolutionState) resolveTypeReferenceDirective(typeRoots []string, from
 			candidate := normalizePathForCJSResolution(r.containingDirectory, r.name)
 			resolved = r.nodeLoadModuleByRelativeName(extensionsDeclaration, candidate, false /*onlyRecordFailures*/, true /*considerPackageJson*/)
 		}
-	} else if r.resolver.traceEnabled() {
-		r.resolver.host.Trace(diagnostics.Resolving_type_reference_directive_for_program_that_specifies_custom_typeRoots_skipping_lookup_in_node_modules_folder.Format())
+	} else if r.tracer != nil {
+		r.tracer.write(diagnostics.Resolving_type_reference_directive_for_program_that_specifies_custom_typeRoots_skipping_lookup_in_node_modules_folder.Format())
 	}
 	return r.createResolvedTypeReferenceDirective(resolved, false /*primary*/)
 }
@@ -352,8 +376,8 @@ func (r *resolutionState) getCandidateFromTypeRoot(typeRoot string) string {
 
 func (r *resolutionState) mangleScopedPackageName(name string) string {
 	mangled := MangleScopedPackageName(name)
-	if r.resolver.traceEnabled() && mangled != name {
-		r.resolver.host.Trace(diagnostics.Scoped_package_detected_looking_in_0.Format(mangled))
+	if r.tracer != nil && mangled != name {
+		r.tracer.write(diagnostics.Scoped_package_detected_looking_in_0.Format(mangled))
 	}
 	return mangled
 }
@@ -373,12 +397,12 @@ func (r *resolutionState) getPackageScopeForPath(directory string) *packagejson.
 }
 
 func (r *resolutionState) resolveNodeLike() *ResolvedModule {
-	if r.resolver.traceEnabled() {
+	if r.tracer != nil {
 		conditions := strings.Join(core.Map(r.conditions, func(c string) string { return `'` + c + `'` }), ", ")
 		if r.esmMode {
-			r.resolver.host.Trace(diagnostics.Resolving_in_0_mode_with_conditions_1.Format("ESM", conditions))
+			r.tracer.write(diagnostics.Resolving_in_0_mode_with_conditions_1.Format("ESM", conditions))
 		} else {
-			r.resolver.host.Trace(diagnostics.Resolving_in_0_mode_with_conditions_1.Format("CJS", conditions))
+			r.tracer.write(diagnostics.Resolving_in_0_mode_with_conditions_1.Format("CJS", conditions))
 		}
 	}
 	result := r.resolveNodeLikeWorker()
@@ -391,8 +415,8 @@ func (r *resolutionState) resolveNodeLike() *ResolvedModule {
 		result.IsExternalLibraryImport &&
 		!extensionIsOk(extensionsTypeScript|extensionsDeclaration, result.Extension) &&
 		slices.Contains(r.conditions, "import") {
-		if r.resolver.traceEnabled() {
-			r.resolver.host.Trace(diagnostics.Resolution_of_non_relative_name_failed_trying_with_modern_Node_resolution_features_disabled_to_see_if_npm_library_needs_configuration_update.Format())
+		if r.tracer != nil {
+			r.tracer.write(diagnostics.Resolution_of_non_relative_name_failed_trying_with_modern_Node_resolution_features_disabled_to_see_if_npm_library_needs_configuration_update.Format())
 		}
 		r.features = r.features & ^NodeResolutionFeaturesExports
 		r.extensions = r.extensions & (extensionsTypeScript | extensionsDeclaration)
@@ -422,13 +446,13 @@ func (r *resolutionState) resolveNodeLikeWorker() *ResolvedModule {
 			}
 		}
 		if strings.Contains(r.name, ":") {
-			if r.resolver.traceEnabled() {
-				r.resolver.host.Trace(diagnostics.Skipping_module_0_that_looks_like_an_absolute_URI_target_file_types_Colon_1.Format(r.name, r.extensions.String()))
+			if r.tracer != nil {
+				r.tracer.write(diagnostics.Skipping_module_0_that_looks_like_an_absolute_URI_target_file_types_Colon_1.Format(r.name, r.extensions.String()))
 			}
 			return r.createResolvedModule(nil, false)
 		}
-		if r.resolver.traceEnabled() {
-			r.resolver.host.Trace(diagnostics.Loading_module_0_from_node_modules_folder_target_file_types_Colon_1.Format(r.name, r.extensions.String()))
+		if r.tracer != nil {
+			r.tracer.write(diagnostics.Loading_module_0_from_node_modules_folder_target_file_types_Colon_1.Format(r.name, r.extensions.String()))
 		}
 		if resolved := r.loadModuleFromNearestNodeModulesDirectory(false /*typesScopeOnly*/); !resolved.shouldContinueSearching() {
 			return r.createResolvedModuleHandlingSymlink(resolved)
@@ -499,24 +523,24 @@ func (r *resolutionState) loadModuleFromSelfNameReference() *resolved {
 
 func (r *resolutionState) loadModuleFromImports() *resolved {
 	if r.name == "#" || strings.HasPrefix(r.name, "#/") {
-		if r.resolver.traceEnabled() {
-			r.resolver.host.Trace(diagnostics.Invalid_import_specifier_0_has_no_possible_resolutions.Format(r.name))
+		if r.tracer != nil {
+			r.tracer.write(diagnostics.Invalid_import_specifier_0_has_no_possible_resolutions.Format(r.name))
 		}
 		return continueSearching()
 	}
 	directoryPath := tspath.GetNormalizedAbsolutePath(r.containingDirectory, r.resolver.host.GetCurrentDirectory())
 	scope := r.getPackageScopeForPath(directoryPath)
 	if !scope.Exists() {
-		if r.resolver.traceEnabled() {
-			r.resolver.host.Trace(diagnostics.Directory_0_has_no_containing_package_json_scope_Imports_will_not_resolve.Format(directoryPath))
+		if r.tracer != nil {
+			r.tracer.write(diagnostics.Directory_0_has_no_containing_package_json_scope_Imports_will_not_resolve.Format(directoryPath))
 		}
 		return continueSearching()
 	}
 	if scope.Contents.Imports.Type != packagejson.JSONValueTypeObject {
 		// !!! Old compiler only checks for undefined, but then assumes `imports` is an object if present.
 		// Maybe should have a new diagnostic for imports of an invalid type. Also, array should be handled?
-		if r.resolver.traceEnabled() {
-			r.resolver.host.Trace(diagnostics.X_package_json_scope_0_has_no_imports_defined.Format(scope.PackageDirectory))
+		if r.tracer != nil {
+			r.tracer.write(diagnostics.X_package_json_scope_0_has_no_imports_defined.Format(scope.PackageDirectory))
 		}
 		return continueSearching()
 	}
@@ -525,8 +549,8 @@ func (r *resolutionState) loadModuleFromImports() *resolved {
 		return result
 	}
 
-	if r.resolver.traceEnabled() {
-		r.resolver.host.Trace(diagnostics.Import_specifier_0_does_not_exist_in_package_json_scope_at_path_1.Format(r.name, scope.PackageDirectory))
+	if r.tracer != nil {
+		r.tracer.write(diagnostics.Import_specifier_0_does_not_exist_in_package_json_scope_at_path_1.Format(r.name, scope.PackageDirectory))
 	}
 	return continueSearching()
 }
@@ -558,8 +582,8 @@ func (r *resolutionState) loadModuleFromExports(packageInfo *packagejson.InfoCac
 		}
 	}
 
-	if r.resolver.traceEnabled() {
-		r.resolver.host.Trace(diagnostics.Export_specifier_0_does_not_exist_in_package_json_scope_at_path_1.Format(subpath, packageInfo.PackageDirectory))
+	if r.tracer != nil {
+		r.tracer.write(diagnostics.Export_specifier_0_does_not_exist_in_package_json_scope_at_path_1.Format(subpath, packageInfo.PackageDirectory))
 	}
 	return continueSearching()
 }
@@ -610,8 +634,8 @@ func (r *resolutionState) loadModuleFromTargetExportOrImport(extensions extensio
 	case packagejson.JSONValueTypeString:
 		targetString, _ := target.Value.(string)
 		if !isPattern && len(subpath) > 0 && !strings.HasSuffix(targetString, "/") {
-			if r.resolver.traceEnabled() {
-				r.resolver.host.Trace(diagnostics.X_package_json_scope_0_has_invalid_type_for_target_of_specifier_1.Format(scope.PackageDirectory, moduleName))
+			if r.tracer != nil {
+				r.tracer.write(diagnostics.X_package_json_scope_0_has_invalid_type_for_target_of_specifier_1.Format(scope.PackageDirectory, moduleName))
 			}
 			return continueSearching()
 		}
@@ -621,9 +645,9 @@ func (r *resolutionState) loadModuleFromTargetExportOrImport(extensions extensio
 				if isPattern {
 					combinedLookup = strings.ReplaceAll(targetString, "*", subpath)
 				}
-				if r.resolver.traceEnabled() {
-					r.resolver.host.Trace(diagnostics.Using_0_subpath_1_with_target_2.Format("imports", key, combinedLookup))
-					r.resolver.host.Trace(diagnostics.Resolving_module_0_from_1.Format(combinedLookup, scope.PackageDirectory+"/"))
+				if r.tracer != nil {
+					r.tracer.write(diagnostics.Using_0_subpath_1_with_target_2.Format("imports", key, combinedLookup))
+					r.tracer.write(diagnostics.Resolving_module_0_from_1.Format(combinedLookup, scope.PackageDirectory+"/"))
 				}
 				name, containingDirectory := r.name, r.containingDirectory
 				r.name, r.containingDirectory = combinedLookup, scope.PackageDirectory+"/"
@@ -641,8 +665,8 @@ func (r *resolutionState) loadModuleFromTargetExportOrImport(extensions extensio
 				}
 				return continueSearching()
 			}
-			if r.resolver.traceEnabled() {
-				r.resolver.host.Trace(diagnostics.X_package_json_scope_0_has_invalid_type_for_target_of_specifier_1.Format(scope.PackageDirectory, moduleName))
+			if r.tracer != nil {
+				r.tracer.write(diagnostics.X_package_json_scope_0_has_invalid_type_for_target_of_specifier_1.Format(scope.PackageDirectory, moduleName))
 			}
 			return continueSearching()
 		}
@@ -654,8 +678,8 @@ func (r *resolutionState) loadModuleFromTargetExportOrImport(extensions extensio
 		}
 		partsAfterFirst := parts[1:]
 		if slices.Contains(partsAfterFirst, "..") || slices.Contains(partsAfterFirst, ".") || slices.Contains(partsAfterFirst, "node_modules") {
-			if r.resolver.traceEnabled() {
-				r.resolver.host.Trace(diagnostics.X_package_json_scope_0_has_invalid_type_for_target_of_specifier_1.Format(scope.PackageDirectory, moduleName))
+			if r.tracer != nil {
+				r.tracer.write(diagnostics.X_package_json_scope_0_has_invalid_type_for_target_of_specifier_1.Format(scope.PackageDirectory, moduleName))
 			}
 			return continueSearching()
 		}
@@ -664,20 +688,20 @@ func (r *resolutionState) loadModuleFromTargetExportOrImport(extensions extensio
 		// to be in the business of validating everyone's import and export map correctness.
 		subpathParts := tspath.GetPathComponents(subpath, "")
 		if slices.Contains(subpathParts, "..") || slices.Contains(subpathParts, ".") || slices.Contains(subpathParts, "node_modules") {
-			if r.resolver.traceEnabled() {
-				r.resolver.host.Trace(diagnostics.X_package_json_scope_0_has_invalid_type_for_target_of_specifier_1.Format(scope.PackageDirectory, moduleName))
+			if r.tracer != nil {
+				r.tracer.write(diagnostics.X_package_json_scope_0_has_invalid_type_for_target_of_specifier_1.Format(scope.PackageDirectory, moduleName))
 			}
 			return continueSearching()
 		}
 
-		if r.resolver.traceEnabled() {
+		if r.tracer != nil {
 			var messageTarget string
 			if isPattern {
 				messageTarget = strings.ReplaceAll(targetString, "*", subpath)
 			} else {
 				messageTarget = targetString + subpath
 			}
-			r.resolver.host.Trace(diagnostics.Using_0_subpath_1_with_target_2.Format(core.IfElse(isImports, "imports", "exports"), key, messageTarget))
+			r.tracer.write(diagnostics.Using_0_subpath_1_with_target_2.Format(core.IfElse(isImports, "imports", "exports"), key, messageTarget))
 		}
 		var finalPath string
 		if isPattern {
@@ -695,40 +719,40 @@ func (r *resolutionState) loadModuleFromTargetExportOrImport(extensions extensio
 		return continueSearching()
 
 	case packagejson.JSONValueTypeObject:
-		if r.resolver.traceEnabled() {
-			r.resolver.host.Trace(diagnostics.Entering_conditional_exports.Format())
+		if r.tracer != nil {
+			r.tracer.write(diagnostics.Entering_conditional_exports.Format())
 		}
 		for condition := range target.AsObject().Keys() {
 			if r.conditionMatches(condition) {
-				if r.resolver.traceEnabled() {
-					r.resolver.host.Trace(diagnostics.Matched_0_condition_1.Format(core.IfElse(isImports, "imports", "exports"), condition))
+				if r.tracer != nil {
+					r.tracer.write(diagnostics.Matched_0_condition_1.Format(core.IfElse(isImports, "imports", "exports"), condition))
 				}
 				subTarget, _ := target.AsObject().Get(condition)
 				if result := r.loadModuleFromTargetExportOrImport(extensions, moduleName, scope, isImports, subTarget, subpath, isPattern, key); !result.shouldContinueSearching() {
-					if r.resolver.traceEnabled() {
-						r.resolver.host.Trace(diagnostics.Resolved_under_condition_0.Format(condition))
+					if r.tracer != nil {
+						r.tracer.write(diagnostics.Resolved_under_condition_0.Format(condition))
 					}
-					if r.resolver.traceEnabled() {
-						r.resolver.host.Trace(diagnostics.Exiting_conditional_exports.Format())
+					if r.tracer != nil {
+						r.tracer.write(diagnostics.Exiting_conditional_exports.Format())
 					}
 					return result
-				} else if r.resolver.traceEnabled() {
-					r.resolver.host.Trace(diagnostics.Failed_to_resolve_under_condition_0.Format(condition))
+				} else if r.tracer != nil {
+					r.tracer.write(diagnostics.Failed_to_resolve_under_condition_0.Format(condition))
 				}
 			} else {
-				if r.resolver.traceEnabled() {
-					r.resolver.host.Trace(diagnostics.Saw_non_matching_condition_0.Format(condition))
+				if r.tracer != nil {
+					r.tracer.write(diagnostics.Saw_non_matching_condition_0.Format(condition))
 				}
 			}
 		}
-		if r.resolver.traceEnabled() {
-			r.resolver.host.Trace(diagnostics.Exiting_conditional_exports.Format())
+		if r.tracer != nil {
+			r.tracer.write(diagnostics.Exiting_conditional_exports.Format())
 		}
 		return continueSearching()
 	case packagejson.JSONValueTypeArray:
 		if len(target.AsArray()) == 0 {
-			if r.resolver.traceEnabled() {
-				r.resolver.host.Trace(diagnostics.X_package_json_scope_0_has_invalid_type_for_target_of_specifier_1.Format(scope.PackageDirectory, moduleName))
+			if r.tracer != nil {
+				r.tracer.write(diagnostics.X_package_json_scope_0_has_invalid_type_for_target_of_specifier_1.Format(scope.PackageDirectory, moduleName))
 			}
 			return continueSearching()
 		}
@@ -739,14 +763,14 @@ func (r *resolutionState) loadModuleFromTargetExportOrImport(extensions extensio
 		}
 
 	case packagejson.JSONValueTypeNull:
-		if r.resolver.traceEnabled() {
-			r.resolver.host.Trace(diagnostics.X_package_json_scope_0_explicitly_maps_specifier_1_to_null.Format(scope.PackageDirectory, moduleName))
+		if r.tracer != nil {
+			r.tracer.write(diagnostics.X_package_json_scope_0_explicitly_maps_specifier_1_to_null.Format(scope.PackageDirectory, moduleName))
 		}
 		return continueSearching()
 	}
 
-	if r.resolver.traceEnabled() {
-		r.resolver.host.Trace(diagnostics.X_package_json_scope_0_has_invalid_type_for_target_of_specifier_1.Format(scope.PackageDirectory, moduleName))
+	if r.tracer != nil {
+		r.tracer.write(diagnostics.X_package_json_scope_0_has_invalid_type_for_target_of_specifier_1.Format(scope.PackageDirectory, moduleName))
 	}
 	return continueSearching()
 }
@@ -865,8 +889,8 @@ func (r *resolutionState) loadModuleFromNearestNodeModulesDirectory(typesScopeOn
 	secondaryExtensions := r.extensions & ^(extensionsTypeScript | extensionsDeclaration)
 	// (1)
 	if priorityExtensions != 0 {
-		if r.resolver.traceEnabled() {
-			r.resolver.host.Trace(diagnostics.Searching_all_ancestor_node_modules_directories_for_preferred_extensions_Colon_0.Format(priorityExtensions.String()))
+		if r.tracer != nil {
+			r.tracer.write(diagnostics.Searching_all_ancestor_node_modules_directories_for_preferred_extensions_Colon_0.Format(priorityExtensions.String()))
 		}
 		if result := r.loadModuleFromNearestNodeModulesDirectoryWorker(priorityExtensions, mode, typesScopeOnly); !result.shouldContinueSearching() {
 			return result
@@ -874,8 +898,8 @@ func (r *resolutionState) loadModuleFromNearestNodeModulesDirectory(typesScopeOn
 	}
 	// (2)
 	if secondaryExtensions != 0 && !typesScopeOnly {
-		if r.resolver.traceEnabled() {
-			r.resolver.host.Trace(diagnostics.Searching_all_ancestor_node_modules_directories_for_fallback_extensions_Colon_0.Format(secondaryExtensions.String()))
+		if r.tracer != nil {
+			r.tracer.write(diagnostics.Searching_all_ancestor_node_modules_directories_for_fallback_extensions_Colon_0.Format(secondaryExtensions.String()))
 		}
 		return r.loadModuleFromNearestNodeModulesDirectoryWorker(secondaryExtensions, mode, typesScopeOnly)
 	}
@@ -900,8 +924,8 @@ func (r *resolutionState) loadModuleFromNearestNodeModulesDirectoryWorker(ext ex
 func (r *resolutionState) loadModuleFromImmediateNodeModulesDirectory(extensions extensions, directory string, typesScopeOnly bool) *resolved {
 	nodeModulesFolder := tspath.CombinePaths(directory, "node_modules")
 	nodeModulesFolderExists := r.resolver.host.FS().DirectoryExists(nodeModulesFolder)
-	if !nodeModulesFolderExists && r.resolver.traceEnabled() {
-		r.resolver.host.Trace(diagnostics.Directory_0_does_not_exist_skipping_all_lookups_in_it.Format(nodeModulesFolder))
+	if !nodeModulesFolderExists && r.tracer != nil {
+		r.tracer.write(diagnostics.Directory_0_does_not_exist_skipping_all_lookups_in_it.Format(nodeModulesFolder))
 	}
 
 	if !typesScopeOnly {
@@ -913,8 +937,8 @@ func (r *resolutionState) loadModuleFromImmediateNodeModulesDirectory(extensions
 	if extensions&extensionsDeclaration != 0 {
 		nodeModulesAtTypes := tspath.CombinePaths(nodeModulesFolder, "@types")
 		nodeModulesAtTypesExists := nodeModulesFolderExists && r.resolver.host.FS().DirectoryExists(nodeModulesAtTypes)
-		if !nodeModulesAtTypesExists && r.resolver.traceEnabled() {
-			r.resolver.host.Trace(diagnostics.Directory_0_does_not_exist_skipping_all_lookups_in_it.Format(nodeModulesAtTypes))
+		if !nodeModulesAtTypesExists && r.tracer != nil {
+			r.tracer.write(diagnostics.Directory_0_does_not_exist_skipping_all_lookups_in_it.Format(nodeModulesAtTypes))
 		}
 		return r.loadModuleFromSpecificNodeModulesDirectory(extensionsDeclaration, r.mangleScopedPackageName(r.name), nodeModulesAtTypes, nodeModulesAtTypesExists)
 	}
@@ -990,8 +1014,8 @@ func (r *resolutionState) loadModuleFromSpecificNodeModulesDirectory(ext extensi
 		if rest != "" {
 			versionPaths := packageInfo.Contents.GetVersionPaths(r.getTraceFunc())
 			if versionPaths.Exists() {
-				if r.resolver.traceEnabled() {
-					r.resolver.host.Trace(diagnostics.X_package_json_has_a_typesVersions_entry_0_that_matches_compiler_version_1_looking_for_a_pattern_to_match_module_name_2.Format(versionPaths.Version, core.Version(), rest))
+				if r.tracer != nil {
+					r.tracer.write(diagnostics.X_package_json_has_a_typesVersions_entry_0_that_matches_compiler_version_1_looking_for_a_pattern_to_match_module_name_2.Format(versionPaths.Version, core.Version(), rest))
 				}
 				packageDirectoryExists := nodeModulesDirectoryExists && r.resolver.host.FS().DirectoryExists(packageDirectory)
 				pathPatterns := TryParsePatterns(versionPaths.GetPaths())
@@ -1086,8 +1110,8 @@ func (r *resolutionState) tryLoadModuleUsingOptionalResolutionSettings() *resolv
 
 func (r *resolutionState) tryLoadModuleUsingPathsIfEligible() *resolved {
 	if r.compilerOptions.Paths.Size() > 0 && !tspath.PathIsRelative(r.name) {
-		if r.resolver.traceEnabled() {
-			r.resolver.host.Trace(diagnostics.X_paths_option_is_specified_looking_for_a_pattern_to_match_module_name_0.Format(r.name))
+		if r.tracer != nil {
+			r.tracer.write(diagnostics.X_paths_option_is_specified_looking_for_a_pattern_to_match_module_name_0.Format(r.name))
 		}
 	} else {
 		return continueSearching()
@@ -1110,14 +1134,14 @@ func (r *resolutionState) tryLoadModuleUsingPathsIfEligible() *resolved {
 func (r *resolutionState) tryLoadModuleUsingPaths(extensions extensions, moduleName string, containingDirectory string, paths *collections.OrderedMap[string, []string], pathPatterns *ParsedPatterns, loader resolutionKindSpecificLoader, onlyRecordFailures bool) *resolved {
 	if matchedPattern := MatchPatternOrExact(pathPatterns, moduleName); matchedPattern.IsValid() {
 		matchedStar := matchedPattern.MatchedText(moduleName)
-		if r.resolver.traceEnabled() {
-			r.resolver.host.Trace(diagnostics.Module_name_0_matched_pattern_1.Format(moduleName, matchedPattern.Text))
+		if r.tracer != nil {
+			r.tracer.write(diagnostics.Module_name_0_matched_pattern_1.Format(moduleName, matchedPattern.Text))
 		}
 		for _, subst := range paths.GetOrZero(matchedPattern.Text) {
 			path := strings.Replace(subst, "*", matchedStar, 1)
 			candidate := tspath.NormalizePath(tspath.CombinePaths(containingDirectory, path))
-			if r.resolver.traceEnabled() {
-				r.resolver.host.Trace(diagnostics.Trying_substitution_0_candidate_module_location_Colon_1.Format(subst, path))
+			if r.tracer != nil {
+				r.tracer.write(diagnostics.Trying_substitution_0_candidate_module_location_Colon_1.Format(subst, path))
 			}
 			// A path mapping may have an extension
 			if extension := tspath.TryGetExtensionFromPath(subst); extension != "" {
@@ -1137,15 +1161,15 @@ func (r *resolutionState) tryLoadModuleUsingPaths(extensions extensions, moduleN
 }
 
 func (r *resolutionState) nodeLoadModuleByRelativeName(extensions extensions, candidate string, onlyRecordFailures bool, considerPackageJson bool) *resolved {
-	if r.resolver.traceEnabled() {
-		r.resolver.host.Trace(diagnostics.Loading_module_as_file_Slash_folder_candidate_module_location_0_target_file_types_Colon_1.Format(candidate, extensions.String()))
+	if r.tracer != nil {
+		r.tracer.write(diagnostics.Loading_module_as_file_Slash_folder_candidate_module_location_0_target_file_types_Colon_1.Format(candidate, extensions.String()))
 	}
 	if !tspath.HasTrailingDirectorySeparator(candidate) {
 		if !onlyRecordFailures {
 			parentOfCandidate := tspath.GetDirectoryPath(candidate)
 			if !r.resolver.host.FS().DirectoryExists(parentOfCandidate) {
-				if r.resolver.traceEnabled() {
-					r.resolver.host.Trace(diagnostics.Directory_0_does_not_exist_skipping_all_lookups_in_it.Format(parentOfCandidate))
+				if r.tracer != nil {
+					r.tracer.write(diagnostics.Directory_0_does_not_exist_skipping_all_lookups_in_it.Format(parentOfCandidate))
 				}
 				onlyRecordFailures = true
 			}
@@ -1163,8 +1187,8 @@ func (r *resolutionState) nodeLoadModuleByRelativeName(extensions extensions, ca
 	if !onlyRecordFailures {
 		candidateExists := r.resolver.host.FS().DirectoryExists(candidate)
 		if !candidateExists {
-			if r.resolver.traceEnabled() {
-				r.resolver.host.Trace(diagnostics.Directory_0_does_not_exist_skipping_all_lookups_in_it.Format(candidate))
+			if r.tracer != nil {
+				r.tracer.write(diagnostics.Directory_0_does_not_exist_skipping_all_lookups_in_it.Format(candidate))
 			}
 			onlyRecordFailures = true
 		}
@@ -1205,8 +1229,8 @@ func (r *resolutionState) loadModuleFromFileNoImplicitExtensions(extensions exte
 	}
 
 	extension := candidate[len(extensionless):]
-	if r.resolver.traceEnabled() {
-		r.resolver.host.Trace(diagnostics.File_name_0_has_a_1_extension_stripping_it.Format(candidate, extension))
+	if r.tracer != nil {
+		r.tracer.write(diagnostics.File_name_0_has_a_1_extension_stripping_it.Format(candidate, extension))
 	}
 	return r.tryAddingExtensions(extensionless, extensions, extension, onlyRecordFailures)
 }
@@ -1359,12 +1383,12 @@ func (r *resolutionState) tryFile(fileName string, onlyRecordFailures bool) (str
 func (r *resolutionState) tryFileLookup(fileName string, onlyRecordFailures bool) bool {
 	if !onlyRecordFailures {
 		if r.resolver.host.FS().FileExists(fileName) {
-			if r.resolver.traceEnabled() {
-				r.resolver.host.Trace(diagnostics.File_0_exists_use_it_as_a_name_resolution_result.Format(fileName))
+			if r.tracer != nil {
+				r.tracer.write(diagnostics.File_0_exists_use_it_as_a_name_resolution_result.Format(fileName))
 			}
 			return true
-		} else if r.resolver.traceEnabled() {
-			r.resolver.host.Trace(diagnostics.File_0_does_not_exist.Format(fileName))
+		} else if r.tracer != nil {
+			r.tracer.write(diagnostics.File_0_does_not_exist.Format(fileName))
 		}
 	}
 	r.failedLookupLocations = append(r.failedLookupLocations, fileName)
@@ -1435,8 +1459,8 @@ func (r *resolutionState) loadNodeModuleFromDirectoryWorker(ext extensions, cand
 		} else {
 			moduleName = tspath.GetRelativePathFromDirectory(candidate, indexPath, tspath.ComparePathsOptions{})
 		}
-		if r.resolver.traceEnabled() {
-			r.resolver.host.Trace(diagnostics.X_package_json_has_a_typesVersions_entry_0_that_matches_compiler_version_1_looking_for_a_pattern_to_match_module_name_2.Format(versionPaths.Version, core.Version(), moduleName))
+		if r.tracer != nil {
+			r.tracer.write(diagnostics.X_package_json_has_a_typesVersions_entry_0_that_matches_compiler_version_1_looking_for_a_pattern_to_match_module_name_2.Format(versionPaths.Version, core.Version(), moduleName))
 		}
 		pathPatterns := TryParsePatterns(versionPaths.GetPaths())
 		if result := r.tryLoadModuleUsingPaths(ext, moduleName, candidate, versionPaths.GetPaths(), pathPatterns, loader, onlyRecordFailuresForPackageFile); !result.shouldContinueSearching() {
@@ -1523,8 +1547,8 @@ func (r *resolutionState) getPackageJsonInfo(packageDirectory string, onlyRecord
 
 	if existing := r.resolver.packageJsonInfoCache.Get(packageJsonPath); existing != nil {
 		if existing.Contents != nil {
-			if r.resolver.traceEnabled() {
-				r.resolver.host.Trace(diagnostics.File_0_exists_according_to_earlier_cached_lookups.Format(packageJsonPath))
+			if r.tracer != nil {
+				r.tracer.write(diagnostics.File_0_exists_according_to_earlier_cached_lookups.Format(packageJsonPath))
 			}
 			r.affectingLocations = append(r.affectingLocations, packageJsonPath)
 			if existing.PackageDirectory == packageDirectory {
@@ -1537,8 +1561,8 @@ func (r *resolutionState) getPackageJsonInfo(packageDirectory string, onlyRecord
 				Contents:         existing.Contents,
 			}
 		} else {
-			if existing.DirectoryExists && r.resolver.traceEnabled() {
-				r.resolver.host.Trace(diagnostics.File_0_does_not_exist_according_to_earlier_cached_lookups.Format(packageJsonPath))
+			if existing.DirectoryExists && r.tracer != nil {
+				r.tracer.write(diagnostics.File_0_does_not_exist_according_to_earlier_cached_lookups.Format(packageJsonPath))
 			}
 			r.failedLookupLocations = append(r.failedLookupLocations, packageJsonPath)
 			return nil
@@ -1550,8 +1574,8 @@ func (r *resolutionState) getPackageJsonInfo(packageDirectory string, onlyRecord
 		// Ignore error
 		contents, _ := r.resolver.host.FS().ReadFile(packageJsonPath)
 		packageJsonContent, _ := packagejson.Parse([]byte(contents))
-		if r.resolver.traceEnabled() {
-			r.resolver.host.Trace(diagnostics.Found_package_json_at_0.Format(packageJsonPath))
+		if r.tracer != nil {
+			r.tracer.write(diagnostics.Found_package_json_at_0.Format(packageJsonPath))
 		}
 		result := &packagejson.InfoCacheEntry{
 			PackageDirectory: packageDirectory,
@@ -1566,8 +1590,8 @@ func (r *resolutionState) getPackageJsonInfo(packageDirectory string, onlyRecord
 		r.affectingLocations = append(r.affectingLocations, packageJsonPath)
 		return result
 	} else {
-		if directoryExists && r.resolver.traceEnabled() {
-			r.resolver.host.Trace(diagnostics.File_0_does_not_exist.Format(packageJsonPath))
+		if directoryExists && r.tracer != nil {
+			r.tracer.write(diagnostics.File_0_does_not_exist.Format(packageJsonPath))
 		}
 		if !r.resolver.packageJsonInfoCache.IsReadonly {
 			r.resolver.packageJsonInfoCache.Set(packageJsonPath, &packagejson.InfoCacheEntry{
@@ -1607,8 +1631,8 @@ func (r *resolutionState) readPackageJsonPeerDependencies(packageJsonInfo *packa
 	if !ok || len(peerDependencies.Value) == 0 {
 		return ""
 	}
-	if r.resolver.traceEnabled() {
-		r.resolver.host.Trace(diagnostics.X_package_json_has_a_peerDependencies_field.Message())
+	if r.tracer != nil {
+		r.tracer.write(diagnostics.X_package_json_has_a_peerDependencies_field.Message())
 	}
 	packageDirectory := r.realPath(packageJsonInfo.PackageDirectory)
 	nodeModules := packageDirectory[:strings.LastIndex(packageDirectory, "/node_modules")+len("/node_modules")] + "/"
@@ -1621,11 +1645,11 @@ func (r *resolutionState) readPackageJsonPeerDependencies(packageJsonInfo *packa
 			builder.WriteString(name)
 			builder.WriteString("@")
 			builder.WriteString(version)
-			if r.resolver.traceEnabled() {
-				r.resolver.host.Trace(diagnostics.Found_peerDependency_0_with_1_version.Format(name, version))
+			if r.tracer != nil {
+				r.tracer.write(diagnostics.Found_peerDependency_0_with_1_version.Format(name, version))
 			}
-		} else if r.resolver.traceEnabled() {
-			r.resolver.host.Trace(diagnostics.Failed_to_find_peerDependency_0.Format(name))
+		} else if r.tracer != nil {
+			r.tracer.write(diagnostics.Failed_to_find_peerDependency_0.Format(name))
 		}
 	}
 	return builder.String()
@@ -1633,8 +1657,8 @@ func (r *resolutionState) readPackageJsonPeerDependencies(packageJsonInfo *packa
 
 func (r *resolutionState) realPath(path string) string {
 	rp := tspath.NormalizePath(r.resolver.host.FS().Realpath(path))
-	if r.resolver.traceEnabled() {
-		r.resolver.host.Trace(diagnostics.Resolving_real_path_for_0_result_1.Format(path, rp))
+	if r.tracer != nil {
+		r.tracer.write(diagnostics.Resolving_real_path_for_0_result_1.Format(path, rp))
 	}
 	return rp
 }
@@ -1644,12 +1668,12 @@ func (r *resolutionState) validatePackageJSONField(fieldName string, field packa
 		if field.IsValid() {
 			return true
 		}
-		if r.resolver.traceEnabled() {
-			r.resolver.host.Trace(diagnostics.Expected_type_of_0_field_in_package_json_to_be_1_got_2.Format(fieldName, field.ExpectedJSONType(), field.ActualJSONType()))
+		if r.tracer != nil {
+			r.tracer.write(diagnostics.Expected_type_of_0_field_in_package_json_to_be_1_got_2.Format(fieldName, field.ExpectedJSONType(), field.ActualJSONType()))
 		}
 	}
-	if r.resolver.traceEnabled() {
-		r.resolver.host.Trace(diagnostics.X_package_json_does_not_have_a_0_field.Format(fieldName))
+	if r.tracer != nil {
+		r.tracer.write(diagnostics.X_package_json_does_not_have_a_0_field.Format(fieldName))
 	}
 	return false
 }
@@ -1659,14 +1683,14 @@ func (r *resolutionState) getPackageJSONPathField(fieldName string, field *packa
 		return "", false
 	}
 	if field.Value == "" {
-		if r.resolver.traceEnabled() {
-			r.resolver.host.Trace(diagnostics.X_package_json_had_a_falsy_0_field.Format(fieldName))
+		if r.tracer != nil {
+			r.tracer.write(diagnostics.X_package_json_had_a_falsy_0_field.Format(fieldName))
 		}
 		return "", false
 	}
 	path := tspath.NormalizePath(tspath.CombinePaths(directory, field.Value))
-	if r.resolver.traceEnabled() {
-		r.resolver.host.Trace(diagnostics.X_package_json_has_0_field_1_that_references_2.Format(fieldName, field.Value, path))
+	if r.tracer != nil {
+		r.tracer.write(diagnostics.X_package_json_has_0_field_1_that_references_2.Format(fieldName, field.Value, path))
 	}
 	return path, true
 }
@@ -1688,8 +1712,8 @@ func (r *resolutionState) conditionMatches(condition string) bool {
 }
 
 func (r *resolutionState) getTraceFunc() func(string) {
-	if r.resolver.traceEnabled() {
-		return r.resolver.host.Trace
+	if r.tracer != nil {
+		return r.tracer.write
 	}
 	return nil
 }
diff --git a/internal/module/resolver_test.go b/internal/module/resolver_test.go
index 1c5456d635..eb777c8e33 100644
--- a/internal/module/resolver_test.go
+++ b/internal/module/resolver_test.go
@@ -265,7 +265,7 @@ func doCall(t *testing.T, resolver *module.Resolver, call functionCall, skipLoca
 
 		errorMessageArgs := []any{call.args.Name, call.args.ContainingFile}
 		if call.call == "resolveModuleName" {
-			resolved := resolver.ResolveModuleName(call.args.Name, call.args.ContainingFile, core.ModuleKind(call.args.ResolutionMode), redirectedReference)
+			resolved, _ := resolver.ResolveModuleName(call.args.Name, call.args.ContainingFile, core.ModuleKind(call.args.ResolutionMode), redirectedReference)
 			assert.Check(t, resolved != nil, "ResolveModuleName should not return nil", errorMessageArgs)
 			if expectedResolvedModule, ok := call.returnValue["resolvedModule"].(map[string]any); ok {
 				assert.Check(t, resolved.IsResolved(), errorMessageArgs)
@@ -277,7 +277,7 @@ func doCall(t *testing.T, resolver *module.Resolver, call functionCall, skipLoca
 				assert.Check(t, !resolved.IsResolved(), errorMessageArgs)
 			}
 		} else {
-			resolved := resolver.ResolveTypeReferenceDirective(call.args.Name, call.args.ContainingFile, core.ModuleKind(call.args.ResolutionMode), redirectedReference)
+			resolved, _ := resolver.ResolveTypeReferenceDirective(call.args.Name, call.args.ContainingFile, core.ModuleKind(call.args.ResolutionMode), redirectedReference)
 			assert.Check(t, resolved != nil, "ResolveTypeReferenceDirective should not return nil", errorMessageArgs)
 			if expectedResolvedTypeReferenceDirective, ok := call.returnValue["resolvedTypeReferenceDirective"].(map[string]any); ok {
 				assert.Check(t, resolved.IsResolved(), errorMessageArgs)
diff --git a/internal/module/types.go b/internal/module/types.go
index f3c78cc715..7dbc899f31 100644
--- a/internal/module/types.go
+++ b/internal/module/types.go
@@ -14,7 +14,6 @@ import (
 type ResolutionHost interface {
 	FS() vfs.FS
 	GetCurrentDirectory() string
-	Trace(msg string)
 }
 
 type ModeAwareCacheKey struct {
diff --git a/internal/project/ata.go b/internal/project/ata.go
index c457a62b80..659bec2e99 100644
--- a/internal/project/ata.go
+++ b/internal/project/ata.go
@@ -565,7 +565,7 @@ func (ti *TypingsInstaller) ensureTypingsLocationExists(p *Project) {
 }
 
 func (ti *TypingsInstaller) typingToFileName(resolver *module.Resolver, packageName string) string {
-	result := resolver.ResolveModuleName(packageName, tspath.CombinePaths(ti.TypingsLocation, "index.d.ts"), core.ModuleKindNone, nil)
+	result, _ := resolver.ResolveModuleName(packageName, tspath.CombinePaths(ti.TypingsLocation, "index.d.ts"), core.ModuleKindNone, nil)
 	return result.ResolvedFileName
 }
 
diff --git a/internal/testrunner/compiler_runner.go b/internal/testrunner/compiler_runner.go
index 9b1891d081..c145fd5dda 100644
--- a/internal/testrunner/compiler_runner.go
+++ b/internal/testrunner/compiler_runner.go
@@ -192,6 +192,7 @@ func (r *CompilerBaselineRunner) runSingleConfigTest(t *testing.T, testName stri
 	compilerTest.verifySourceMapOutput(t, r.testSuitName, r.isSubmodule)
 	compilerTest.verifySourceMapRecord(t, r.testSuitName, r.isSubmodule)
 	compilerTest.verifyTypesAndSymbols(t, r.testSuitName, r.isSubmodule)
+	compilerTest.verifyModuleResolution(t, r.testSuitName, r.isSubmodule)
 	// !!! Verify all baselines
 
 	compilerTest.verifyUnionOrdering(t)
@@ -510,6 +511,21 @@ func (c *compilerTest) verifyTypesAndSymbols(t *testing.T, suiteName string, isS
 	)
 }
 
+func (c *compilerTest) verifyModuleResolution(t *testing.T, suiteName string, isSubmodule bool) {
+	if !c.options.TraceResolution.IsTrue() {
+		return
+	}
+
+	t.Run("module resolution", func(t *testing.T) {
+		defer testutil.RecoverAndFail(t, "Panic on creating module resolution baseline for test "+c.filename)
+		tsbaseline.DoModuleResolutionBaseline(t, c.configuredName, c.result.Trace, baseline.Options{
+			Subfolder:       suiteName,
+			IsSubmodule:     isSubmodule,
+			SkipDiffWithOld: true,
+		})
+	})
+}
+
 func createHarnessTestFile(unit *testUnit, currentDirectory string) *harnessutil.TestFile {
 	return &harnessutil.TestFile{
 		UnitName: tspath.GetNormalizedAbsolutePath(unit.name, currentDirectory),
diff --git a/internal/testutil/baseline/baseline.go b/internal/testutil/baseline/baseline.go
index dcaa21e19d..372d0b0018 100644
--- a/internal/testutil/baseline/baseline.go
+++ b/internal/testutil/baseline/baseline.go
@@ -23,6 +23,7 @@ type Options struct {
 	IsSubmodule         bool
 	IsSubmoduleAccepted bool
 	DiffFixupOld        func(string) string
+	SkipDiffWithOld     bool
 }
 
 const NoContent = "<no content>"
@@ -42,7 +43,7 @@ func Run(t *testing.T, fileName string, actual string, opts Options) {
 		writeComparison(t, actual, localPath, referencePath, false)
 	}
 
-	if !opts.IsSubmodule {
+	if !opts.IsSubmodule || opts.SkipDiffWithOld {
 		// Not a submodule, no diffs.
 		return
 	}
diff --git a/internal/testutil/harnessutil/harnessutil.go b/internal/testutil/harnessutil/harnessutil.go
index 0d0db4dec9..e63992e113 100644
--- a/internal/testutil/harnessutil/harnessutil.go
+++ b/internal/testutil/harnessutil/harnessutil.go
@@ -221,6 +221,7 @@ func CompileFilesEx(
 		Errors:     errors,
 	}, harnessOptions)
 	result.Symlinks = symlinks
+	result.Trace = host.tracer.String()
 	result.Repeat = func(testConfig TestConfiguration) *CompilationResult {
 		newHarnessOptions := *harnessOptions
 		newCompilerOptions := compilerOptions.Clone()
@@ -460,6 +461,7 @@ func getOptionValue(t *testing.T, option *tsoptions.CommandLineOption, value str
 
 type cachedCompilerHost struct {
 	compiler.CompilerHost
+	tracer *strings.Builder
 }
 
 var sourceFileCache collections.SyncMap[SourceFileCacheKey, *ast.SourceFile]
@@ -500,9 +502,14 @@ func (h *cachedCompilerHost) GetSourceFile(opts ast.SourceFileParseOptions) *ast
 	return result
 }
 
-func createCompilerHost(fs vfs.FS, defaultLibraryPath string, currentDirectory string) compiler.CompilerHost {
+func createCompilerHost(fs vfs.FS, defaultLibraryPath string, currentDirectory string) *cachedCompilerHost {
+	var tracer strings.Builder
+	trace := func(msg string) {
+		fmt.Fprintln(&tracer, msg)
+	}
 	return &cachedCompilerHost{
-		CompilerHost: compiler.NewCompilerHost(currentDirectory, fs, defaultLibraryPath, nil),
+		CompilerHost: compiler.NewCompilerHost(currentDirectory, fs, defaultLibraryPath, nil, trace),
+		tracer:       &tracer,
 	}
 }
 
@@ -598,6 +605,7 @@ type CompilationResult struct {
 	outputs          []*TestFile
 	inputs           []*TestFile
 	inputsAndOutputs collections.OrderedMap[string, *CompilationOutput]
+	Trace            string
 }
 
 type CompilationOutput struct {
diff --git a/internal/testutil/tsbaseline/module_resolution_baseline.go b/internal/testutil/tsbaseline/module_resolution_baseline.go
new file mode 100644
index 0000000000..c2a4a74201
--- /dev/null
+++ b/internal/testutil/tsbaseline/module_resolution_baseline.go
@@ -0,0 +1,18 @@
+package tsbaseline
+
+import (
+	"testing"
+
+	"github.com/microsoft/typescript-go/internal/testutil/baseline"
+)
+
+func DoModuleResolutionBaseline(t *testing.T, baselinePath string, trace string, opts baseline.Options) {
+	baselinePath = tsExtension.ReplaceAllString(baselinePath, ".trace.json")
+	var errorBaseline string
+	if trace != "" {
+		errorBaseline = trace
+	} else {
+		errorBaseline = baseline.NoContent
+	}
+	baseline.Run(t, baselinePath, errorBaseline, opts)
+}
diff --git a/testdata/baselines/reference/submodule/compiler/allowJsCrossMonorepoPackage.trace.json b/testdata/baselines/reference/submodule/compiler/allowJsCrossMonorepoPackage.trace.json
new file mode 100644
index 0000000000..5ddc5147cd
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/allowJsCrossMonorepoPackage.trace.json
@@ -0,0 +1,78 @@
+======== Resolving module 'shared' from '/packages/main/index.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Found 'package.json' at '/packages/main/package.json'.
+Loading module 'shared' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Found 'package.json' at '/packages/main/node_modules/shared/package.json'.
+Using 'exports' subpath '.' with target './index.js'.
+File name '/packages/main/node_modules/shared/index.js' has a '.js' extension - stripping it.
+File '/packages/main/node_modules/shared/index.ts' does not exist.
+File '/packages/main/node_modules/shared/index.tsx' does not exist.
+File '/packages/main/node_modules/shared/index.d.ts' does not exist.
+Directory '/packages/main/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/packages/node_modules' does not exist, skipping all lookups in it.
+Directory '/packages/node_modules/@types' does not exist, skipping all lookups in it.
+File '/node_modules/shared.ts' does not exist.
+File '/node_modules/shared.tsx' does not exist.
+File '/node_modules/shared.d.ts' does not exist.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript, JSON.
+File '/packages/main/node_modules/shared/package.json' exists according to earlier cached lookups.
+Using 'exports' subpath '.' with target './index.js'.
+File name '/packages/main/node_modules/shared/index.js' has a '.js' extension - stripping it.
+File '/packages/main/node_modules/shared/index.js' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolving real path for '/packages/main/node_modules/shared/index.js', result '/packages/shared/index.js'.
+Resolution of non-relative name failed; trying with modern Node resolution features disabled to see if npm library needs configuration update.
+File '/packages/main/package.json' exists according to earlier cached lookups.
+Loading module 'shared' from 'node_modules' folder, target file types: TypeScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/packages/main/node_modules/shared/package.json' exists according to earlier cached lookups.
+File '/packages/main/node_modules/shared.ts' does not exist.
+File '/packages/main/node_modules/shared.tsx' does not exist.
+File '/packages/main/node_modules/shared.d.ts' does not exist.
+'package.json' does not have a 'typesVersions' field.
+'package.json' does not have a 'typings' field.
+'package.json' does not have a 'types' field.
+'package.json' does not have a 'main' field.
+File '/packages/main/node_modules/shared/index.ts' does not exist.
+File '/packages/main/node_modules/shared/index.tsx' does not exist.
+File '/packages/main/node_modules/shared/index.d.ts' does not exist.
+Directory '/packages/main/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/packages/node_modules' does not exist, skipping all lookups in it.
+Directory '/packages/node_modules/@types' does not exist, skipping all lookups in it.
+File '/node_modules/shared.ts' does not exist.
+File '/node_modules/shared.tsx' does not exist.
+File '/node_modules/shared.d.ts' does not exist.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+======== Module name 'shared' was successfully resolved to '/packages/shared/index.js' with Package ID 'shared@1.0.0'. ========
+======== Resolving module './utils.js' from '/packages/shared/index.js'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/packages/shared/utils.js', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/packages/shared/utils.js' has a '.js' extension - stripping it.
+File '/packages/shared/utils.ts' does not exist.
+File '/packages/shared/utils.tsx' does not exist.
+File '/packages/shared/utils.d.ts' does not exist.
+File '/packages/shared/utils.js' exists - use it as a name resolution result.
+======== Module name './utils.js' was successfully resolved to '/packages/shared/utils.js'. ========
+======== Resolving module 'pkg' from '/packages/shared/utils.js'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Found 'package.json' at '/packages/shared/package.json'.
+Loading module 'pkg' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Directory '/packages/shared/node_modules' does not exist, skipping all lookups in it.
+Directory '/packages/shared/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/packages/node_modules' does not exist, skipping all lookups in it.
+Directory '/packages/node_modules/@types' does not exist, skipping all lookups in it.
+File '/node_modules/pkg/package.json' does not exist.
+File '/node_modules/pkg.ts' does not exist.
+File '/node_modules/pkg.tsx' does not exist.
+File '/node_modules/pkg.d.ts' does not exist.
+File '/node_modules/pkg/index.ts' does not exist.
+File '/node_modules/pkg/index.tsx' does not exist.
+File '/node_modules/pkg/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/pkg/index.d.ts', result '/node_modules/pkg/index.d.ts'.
+======== Module name 'pkg' was successfully resolved to '/node_modules/pkg/index.d.ts'. ========
diff --git a/testdata/baselines/reference/submodule/compiler/cachedModuleResolution1.trace.json b/testdata/baselines/reference/submodule/compiler/cachedModuleResolution1.trace.json
new file mode 100644
index 0000000000..a28869c97b
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/cachedModuleResolution1.trace.json
@@ -0,0 +1,38 @@
+======== Resolving module 'foo' from '/a/b/c/d/e/app.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/a/b/c/d/e/package.json' does not exist.
+File '/a/b/c/d/package.json' does not exist.
+File '/a/b/c/package.json' does not exist according to earlier cached lookups.
+File '/a/b/package.json' does not exist according to earlier cached lookups.
+File '/a/package.json' does not exist according to earlier cached lookups.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'foo' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Directory '/a/b/c/d/e/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/c/d/e/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/a/b/c/d/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/c/d/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/a/b/c/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/c/node_modules/@types' does not exist, skipping all lookups in it.
+File '/a/b/node_modules/foo.ts' does not exist.
+File '/a/b/node_modules/foo.tsx' does not exist.
+File '/a/b/node_modules/foo.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/a/b/node_modules/foo.d.ts', result '/a/b/node_modules/foo.d.ts'.
+======== Module name 'foo' was successfully resolved to '/a/b/node_modules/foo.d.ts'. ========
+======== Resolving module 'foo' from '/a/b/c/lib.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/a/b/c/package.json' does not exist.
+File '/a/b/package.json' does not exist.
+File '/a/package.json' does not exist.
+File '/package.json' does not exist.
+Loading module 'foo' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Directory '/a/b/c/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/c/node_modules/@types' does not exist, skipping all lookups in it.
+File '/a/b/node_modules/foo.ts' does not exist.
+File '/a/b/node_modules/foo.tsx' does not exist.
+File '/a/b/node_modules/foo.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/a/b/node_modules/foo.d.ts', result '/a/b/node_modules/foo.d.ts'.
+======== Module name 'foo' was successfully resolved to '/a/b/node_modules/foo.d.ts'. ========
diff --git a/testdata/baselines/reference/submodule/compiler/cachedModuleResolution2.trace.json b/testdata/baselines/reference/submodule/compiler/cachedModuleResolution2.trace.json
new file mode 100644
index 0000000000..83f20ce293
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/cachedModuleResolution2.trace.json
@@ -0,0 +1,38 @@
+======== Resolving module 'foo' from '/a/b/c/lib.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/a/b/c/package.json' does not exist according to earlier cached lookups.
+File '/a/b/package.json' does not exist according to earlier cached lookups.
+File '/a/package.json' does not exist according to earlier cached lookups.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'foo' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Directory '/a/b/c/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/c/node_modules/@types' does not exist, skipping all lookups in it.
+File '/a/b/node_modules/foo.ts' does not exist.
+File '/a/b/node_modules/foo.tsx' does not exist.
+File '/a/b/node_modules/foo.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/a/b/node_modules/foo.d.ts', result '/a/b/node_modules/foo.d.ts'.
+======== Module name 'foo' was successfully resolved to '/a/b/node_modules/foo.d.ts'. ========
+======== Resolving module 'foo' from '/a/b/c/d/e/app.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/a/b/c/d/e/package.json' does not exist.
+File '/a/b/c/d/package.json' does not exist.
+File '/a/b/c/package.json' does not exist.
+File '/a/b/package.json' does not exist.
+File '/a/package.json' does not exist.
+File '/package.json' does not exist.
+Loading module 'foo' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Directory '/a/b/c/d/e/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/c/d/e/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/a/b/c/d/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/c/d/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/a/b/c/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/c/node_modules/@types' does not exist, skipping all lookups in it.
+File '/a/b/node_modules/foo.ts' does not exist.
+File '/a/b/node_modules/foo.tsx' does not exist.
+File '/a/b/node_modules/foo.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/a/b/node_modules/foo.d.ts', result '/a/b/node_modules/foo.d.ts'.
+======== Module name 'foo' was successfully resolved to '/a/b/node_modules/foo.d.ts'. ========
diff --git a/testdata/baselines/reference/submodule/compiler/cachedModuleResolution3.trace.json b/testdata/baselines/reference/submodule/compiler/cachedModuleResolution3.trace.json
new file mode 100644
index 0000000000..cf2d0cfbaa
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/cachedModuleResolution3.trace.json
@@ -0,0 +1,54 @@
+======== Resolving module 'foo' from '/a/b/c/d/e/app.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/a/b/c/d/e/package.json' does not exist.
+File '/a/b/c/d/package.json' does not exist.
+File '/a/b/c/package.json' does not exist according to earlier cached lookups.
+File '/a/b/package.json' does not exist according to earlier cached lookups.
+File '/a/package.json' does not exist according to earlier cached lookups.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'foo' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Directory '/a/b/c/d/e/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/c/d/e/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/a/b/c/d/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/c/d/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/a/b/c/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/c/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/a/b/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/a/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript, JSON.
+Directory '/a/b/c/d/e/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/c/d/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/c/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+======== Module name 'foo' was not resolved. ========
+======== Resolving module 'foo' from '/a/b/c/lib.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/a/b/c/package.json' does not exist.
+File '/a/b/package.json' does not exist.
+File '/a/package.json' does not exist.
+File '/package.json' does not exist.
+Loading module 'foo' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Directory '/a/b/c/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/c/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/a/b/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/a/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript, JSON.
+Directory '/a/b/c/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+======== Module name 'foo' was not resolved. ========
diff --git a/testdata/baselines/reference/submodule/compiler/cachedModuleResolution4.trace.json b/testdata/baselines/reference/submodule/compiler/cachedModuleResolution4.trace.json
new file mode 100644
index 0000000000..ce95b62ea7
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/cachedModuleResolution4.trace.json
@@ -0,0 +1,54 @@
+======== Resolving module 'foo' from '/a/b/c/lib.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/a/b/c/package.json' does not exist according to earlier cached lookups.
+File '/a/b/package.json' does not exist according to earlier cached lookups.
+File '/a/package.json' does not exist according to earlier cached lookups.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'foo' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Directory '/a/b/c/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/c/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/a/b/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/a/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript, JSON.
+Directory '/a/b/c/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+======== Module name 'foo' was not resolved. ========
+======== Resolving module 'foo' from '/a/b/c/d/e/app.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/a/b/c/d/e/package.json' does not exist.
+File '/a/b/c/d/package.json' does not exist.
+File '/a/b/c/package.json' does not exist.
+File '/a/b/package.json' does not exist.
+File '/a/package.json' does not exist.
+File '/package.json' does not exist.
+Loading module 'foo' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Directory '/a/b/c/d/e/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/c/d/e/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/a/b/c/d/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/c/d/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/a/b/c/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/c/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/a/b/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/a/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript, JSON.
+Directory '/a/b/c/d/e/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/c/d/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/c/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+======== Module name 'foo' was not resolved. ========
diff --git a/testdata/baselines/reference/submodule/compiler/cachedModuleResolution5.trace.json b/testdata/baselines/reference/submodule/compiler/cachedModuleResolution5.trace.json
new file mode 100644
index 0000000000..e05c3cf00d
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/cachedModuleResolution5.trace.json
@@ -0,0 +1,35 @@
+======== Resolving module 'foo' from '/a/b/c/d/e/app.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/a/b/c/d/e/package.json' does not exist.
+File '/a/b/c/d/package.json' does not exist.
+File '/a/b/c/package.json' does not exist.
+File '/a/b/package.json' does not exist according to earlier cached lookups.
+File '/a/package.json' does not exist according to earlier cached lookups.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'foo' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Directory '/a/b/c/d/e/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/c/d/e/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/a/b/c/d/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/c/d/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/a/b/c/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/c/node_modules/@types' does not exist, skipping all lookups in it.
+File '/a/b/node_modules/foo.ts' does not exist.
+File '/a/b/node_modules/foo.tsx' does not exist.
+File '/a/b/node_modules/foo.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/a/b/node_modules/foo.d.ts', result '/a/b/node_modules/foo.d.ts'.
+======== Module name 'foo' was successfully resolved to '/a/b/node_modules/foo.d.ts'. ========
+======== Resolving module 'foo' from '/a/b/lib.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/a/b/package.json' does not exist.
+File '/a/package.json' does not exist.
+File '/package.json' does not exist.
+Loading module 'foo' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/a/b/node_modules/foo.ts' does not exist.
+File '/a/b/node_modules/foo.tsx' does not exist.
+File '/a/b/node_modules/foo.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/a/b/node_modules/foo.d.ts', result '/a/b/node_modules/foo.d.ts'.
+======== Module name 'foo' was successfully resolved to '/a/b/node_modules/foo.d.ts'. ========
diff --git a/testdata/baselines/reference/submodule/compiler/cachedModuleResolution6.trace.json b/testdata/baselines/reference/submodule/compiler/cachedModuleResolution6.trace.json
new file mode 100644
index 0000000000..cf2d0cfbaa
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/cachedModuleResolution6.trace.json
@@ -0,0 +1,54 @@
+======== Resolving module 'foo' from '/a/b/c/d/e/app.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/a/b/c/d/e/package.json' does not exist.
+File '/a/b/c/d/package.json' does not exist.
+File '/a/b/c/package.json' does not exist according to earlier cached lookups.
+File '/a/b/package.json' does not exist according to earlier cached lookups.
+File '/a/package.json' does not exist according to earlier cached lookups.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'foo' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Directory '/a/b/c/d/e/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/c/d/e/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/a/b/c/d/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/c/d/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/a/b/c/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/c/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/a/b/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/a/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript, JSON.
+Directory '/a/b/c/d/e/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/c/d/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/c/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+======== Module name 'foo' was not resolved. ========
+======== Resolving module 'foo' from '/a/b/c/lib.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/a/b/c/package.json' does not exist.
+File '/a/b/package.json' does not exist.
+File '/a/package.json' does not exist.
+File '/package.json' does not exist.
+Loading module 'foo' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Directory '/a/b/c/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/c/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/a/b/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/a/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript, JSON.
+Directory '/a/b/c/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+======== Module name 'foo' was not resolved. ========
diff --git a/testdata/baselines/reference/submodule/compiler/cachedModuleResolution7.trace.json b/testdata/baselines/reference/submodule/compiler/cachedModuleResolution7.trace.json
new file mode 100644
index 0000000000..ce95b62ea7
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/cachedModuleResolution7.trace.json
@@ -0,0 +1,54 @@
+======== Resolving module 'foo' from '/a/b/c/lib.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/a/b/c/package.json' does not exist according to earlier cached lookups.
+File '/a/b/package.json' does not exist according to earlier cached lookups.
+File '/a/package.json' does not exist according to earlier cached lookups.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'foo' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Directory '/a/b/c/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/c/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/a/b/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/a/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript, JSON.
+Directory '/a/b/c/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+======== Module name 'foo' was not resolved. ========
+======== Resolving module 'foo' from '/a/b/c/d/e/app.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/a/b/c/d/e/package.json' does not exist.
+File '/a/b/c/d/package.json' does not exist.
+File '/a/b/c/package.json' does not exist.
+File '/a/b/package.json' does not exist.
+File '/a/package.json' does not exist.
+File '/package.json' does not exist.
+Loading module 'foo' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Directory '/a/b/c/d/e/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/c/d/e/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/a/b/c/d/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/c/d/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/a/b/c/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/c/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/a/b/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/a/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript, JSON.
+Directory '/a/b/c/d/e/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/c/d/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/c/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+======== Module name 'foo' was not resolved. ========
diff --git a/testdata/baselines/reference/submodule/compiler/cachedModuleResolution8.trace.json b/testdata/baselines/reference/submodule/compiler/cachedModuleResolution8.trace.json
new file mode 100644
index 0000000000..cf2d0cfbaa
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/cachedModuleResolution8.trace.json
@@ -0,0 +1,54 @@
+======== Resolving module 'foo' from '/a/b/c/d/e/app.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/a/b/c/d/e/package.json' does not exist.
+File '/a/b/c/d/package.json' does not exist.
+File '/a/b/c/package.json' does not exist according to earlier cached lookups.
+File '/a/b/package.json' does not exist according to earlier cached lookups.
+File '/a/package.json' does not exist according to earlier cached lookups.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'foo' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Directory '/a/b/c/d/e/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/c/d/e/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/a/b/c/d/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/c/d/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/a/b/c/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/c/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/a/b/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/a/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript, JSON.
+Directory '/a/b/c/d/e/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/c/d/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/c/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+======== Module name 'foo' was not resolved. ========
+======== Resolving module 'foo' from '/a/b/c/lib.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/a/b/c/package.json' does not exist.
+File '/a/b/package.json' does not exist.
+File '/a/package.json' does not exist.
+File '/package.json' does not exist.
+Loading module 'foo' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Directory '/a/b/c/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/c/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/a/b/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/a/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript, JSON.
+Directory '/a/b/c/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+======== Module name 'foo' was not resolved. ========
diff --git a/testdata/baselines/reference/submodule/compiler/cachedModuleResolution9.trace.json b/testdata/baselines/reference/submodule/compiler/cachedModuleResolution9.trace.json
new file mode 100644
index 0000000000..ce95b62ea7
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/cachedModuleResolution9.trace.json
@@ -0,0 +1,54 @@
+======== Resolving module 'foo' from '/a/b/c/lib.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/a/b/c/package.json' does not exist according to earlier cached lookups.
+File '/a/b/package.json' does not exist according to earlier cached lookups.
+File '/a/package.json' does not exist according to earlier cached lookups.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'foo' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Directory '/a/b/c/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/c/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/a/b/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/a/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript, JSON.
+Directory '/a/b/c/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+======== Module name 'foo' was not resolved. ========
+======== Resolving module 'foo' from '/a/b/c/d/e/app.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/a/b/c/d/e/package.json' does not exist.
+File '/a/b/c/d/package.json' does not exist.
+File '/a/b/c/package.json' does not exist.
+File '/a/b/package.json' does not exist.
+File '/a/package.json' does not exist.
+File '/package.json' does not exist.
+Loading module 'foo' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Directory '/a/b/c/d/e/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/c/d/e/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/a/b/c/d/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/c/d/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/a/b/c/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/c/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/a/b/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/a/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript, JSON.
+Directory '/a/b/c/d/e/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/c/d/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/c/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+======== Module name 'foo' was not resolved. ========
diff --git a/testdata/baselines/reference/submodule/compiler/duplicatePackage_relativeImportWithinPackage.trace.json b/testdata/baselines/reference/submodule/compiler/duplicatePackage_relativeImportWithinPackage.trace.json
new file mode 100644
index 0000000000..da9dd1306f
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/duplicatePackage_relativeImportWithinPackage.trace.json
@@ -0,0 +1,61 @@
+======== Resolving module 'foo/use' from '/index.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/package.json' does not exist.
+Loading module 'foo/use' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Found 'package.json' at '/node_modules/foo/package.json'.
+'package.json' does not have a 'typesVersions' field.
+File '/node_modules/foo/use.ts' does not exist.
+File '/node_modules/foo/use.tsx' does not exist.
+File '/node_modules/foo/use.d.ts' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolving real path for '/node_modules/foo/use.d.ts', result '/node_modules/foo/use.d.ts'.
+======== Module name 'foo/use' was successfully resolved to '/node_modules/foo/use.d.ts' with Package ID 'foo@1.2.3'. ========
+======== Resolving module 'a' from '/index.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'a' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/node_modules/a/package.json' does not exist.
+File '/node_modules/a.ts' does not exist.
+File '/node_modules/a.tsx' does not exist.
+File '/node_modules/a.d.ts' does not exist.
+File '/node_modules/a/index.ts' does not exist.
+File '/node_modules/a/index.tsx' does not exist.
+File '/node_modules/a/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/a/index.d.ts', result '/node_modules/a/index.d.ts'.
+======== Module name 'a' was successfully resolved to '/node_modules/a/index.d.ts'. ========
+======== Resolving module './index' from '/node_modules/foo/use.d.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+Loading module as file / folder, candidate module location '/node_modules/foo/index', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/node_modules/foo/index.ts' does not exist.
+File '/node_modules/foo/index.tsx' does not exist.
+File '/node_modules/foo/index.d.ts' exists - use it as a name resolution result.
+File '/node_modules/foo/package.json' exists according to earlier cached lookups.
+'package.json' does not have a 'peerDependencies' field.
+======== Module name './index' was successfully resolved to '/node_modules/foo/index.d.ts' with Package ID 'foo@1.2.3'. ========
+======== Resolving module 'foo' from '/node_modules/a/index.d.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/node_modules/a/package.json' does not exist according to earlier cached lookups.
+File '/node_modules/package.json' does not exist according to earlier cached lookups.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'foo' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Found 'package.json' at '/node_modules/a/node_modules/foo/package.json'.
+File '/node_modules/a/node_modules/foo.ts' does not exist.
+File '/node_modules/a/node_modules/foo.tsx' does not exist.
+File '/node_modules/a/node_modules/foo.d.ts' does not exist.
+'package.json' does not have a 'typesVersions' field.
+'package.json' does not have a 'typings' field.
+'package.json' does not have a 'types' field.
+'package.json' does not have a 'main' field.
+File '/node_modules/a/node_modules/foo/index.ts' does not exist.
+File '/node_modules/a/node_modules/foo/index.tsx' does not exist.
+File '/node_modules/a/node_modules/foo/index.d.ts' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolving real path for '/node_modules/a/node_modules/foo/index.d.ts', result '/node_modules/a/node_modules/foo/index.d.ts'.
+======== Module name 'foo' was successfully resolved to '/node_modules/a/node_modules/foo/index.d.ts' with Package ID 'foo@1.2.3'. ========
diff --git a/testdata/baselines/reference/submodule/compiler/duplicatePackage_relativeImportWithinPackage_scoped.trace.json b/testdata/baselines/reference/submodule/compiler/duplicatePackage_relativeImportWithinPackage_scoped.trace.json
new file mode 100644
index 0000000000..c6dc4bf056
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/duplicatePackage_relativeImportWithinPackage_scoped.trace.json
@@ -0,0 +1,61 @@
+======== Resolving module '@foo/bar/use' from '/index.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/package.json' does not exist.
+Loading module '@foo/bar/use' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Found 'package.json' at '/node_modules/@foo/bar/package.json'.
+'package.json' does not have a 'typesVersions' field.
+File '/node_modules/@foo/bar/use.ts' does not exist.
+File '/node_modules/@foo/bar/use.tsx' does not exist.
+File '/node_modules/@foo/bar/use.d.ts' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolving real path for '/node_modules/@foo/bar/use.d.ts', result '/node_modules/@foo/bar/use.d.ts'.
+======== Module name '@foo/bar/use' was successfully resolved to '/node_modules/@foo/bar/use.d.ts' with Package ID '@foo/bar@1.2.3'. ========
+======== Resolving module 'a' from '/index.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'a' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/node_modules/a/package.json' does not exist.
+File '/node_modules/a.ts' does not exist.
+File '/node_modules/a.tsx' does not exist.
+File '/node_modules/a.d.ts' does not exist.
+File '/node_modules/a/index.ts' does not exist.
+File '/node_modules/a/index.tsx' does not exist.
+File '/node_modules/a/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/a/index.d.ts', result '/node_modules/a/index.d.ts'.
+======== Module name 'a' was successfully resolved to '/node_modules/a/index.d.ts'. ========
+======== Resolving module './index' from '/node_modules/@foo/bar/use.d.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+Loading module as file / folder, candidate module location '/node_modules/@foo/bar/index', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/node_modules/@foo/bar/index.ts' does not exist.
+File '/node_modules/@foo/bar/index.tsx' does not exist.
+File '/node_modules/@foo/bar/index.d.ts' exists - use it as a name resolution result.
+File '/node_modules/@foo/bar/package.json' exists according to earlier cached lookups.
+'package.json' does not have a 'peerDependencies' field.
+======== Module name './index' was successfully resolved to '/node_modules/@foo/bar/index.d.ts' with Package ID '@foo/bar@1.2.3'. ========
+======== Resolving module '@foo/bar' from '/node_modules/a/index.d.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/node_modules/a/package.json' does not exist according to earlier cached lookups.
+File '/node_modules/package.json' does not exist according to earlier cached lookups.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module '@foo/bar' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Found 'package.json' at '/node_modules/a/node_modules/@foo/bar/package.json'.
+File '/node_modules/a/node_modules/@foo/bar.ts' does not exist.
+File '/node_modules/a/node_modules/@foo/bar.tsx' does not exist.
+File '/node_modules/a/node_modules/@foo/bar.d.ts' does not exist.
+'package.json' does not have a 'typesVersions' field.
+'package.json' does not have a 'typings' field.
+'package.json' does not have a 'types' field.
+'package.json' does not have a 'main' field.
+File '/node_modules/a/node_modules/@foo/bar/index.ts' does not exist.
+File '/node_modules/a/node_modules/@foo/bar/index.tsx' does not exist.
+File '/node_modules/a/node_modules/@foo/bar/index.d.ts' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolving real path for '/node_modules/a/node_modules/@foo/bar/index.d.ts', result '/node_modules/a/node_modules/@foo/bar/index.d.ts'.
+======== Module name '@foo/bar' was successfully resolved to '/node_modules/a/node_modules/@foo/bar/index.d.ts' with Package ID '@foo/bar@1.2.3'. ========
diff --git a/testdata/baselines/reference/submodule/compiler/importWithTrailingSlash.trace.json b/testdata/baselines/reference/submodule/compiler/importWithTrailingSlash.trace.json
new file mode 100644
index 0000000000..d6bbd94cff
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/importWithTrailingSlash.trace.json
@@ -0,0 +1,28 @@
+======== Resolving module '.' from '/a/test.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+Loading module as file / folder, candidate module location '/a/', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/a/package.json' does not exist according to earlier cached lookups.
+File '/a/index.ts' exists - use it as a name resolution result.
+======== Module name '.' was successfully resolved to '/a/index.ts'. ========
+======== Resolving module './' from '/a/test.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+Loading module as file / folder, candidate module location '/a/', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/a/package.json' does not exist according to earlier cached lookups.
+File '/a/index.ts' exists - use it as a name resolution result.
+======== Module name './' was successfully resolved to '/a/index.ts'. ========
+======== Resolving module '..' from '/a/b/test.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+Loading module as file / folder, candidate module location '/a/', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/a/package.json' does not exist.
+File '/a/index.ts' exists - use it as a name resolution result.
+======== Module name '..' was successfully resolved to '/a/index.ts'. ========
+======== Resolving module '../' from '/a/b/test.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+Loading module as file / folder, candidate module location '/a/', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/a/package.json' does not exist according to earlier cached lookups.
+File '/a/index.ts' exists - use it as a name resolution result.
+======== Module name '../' was successfully resolved to '/a/index.ts'. ========
diff --git a/testdata/baselines/reference/submodule/compiler/importWithTrailingSlash_noResolve.trace.json b/testdata/baselines/reference/submodule/compiler/importWithTrailingSlash_noResolve.trace.json
new file mode 100644
index 0000000000..86124dfb52
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/importWithTrailingSlash_noResolve.trace.json
@@ -0,0 +1,6 @@
+======== Resolving module './foo/' from '/a.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+Loading module as file / folder, candidate module location '/foo/', target file types: TypeScript, JavaScript, Declaration, JSON.
+Directory '/foo/' does not exist, skipping all lookups in it.
+======== Module name './foo/' was not resolved. ========
diff --git a/testdata/baselines/reference/submodule/compiler/libTypeScriptOverrideSimple.trace.json b/testdata/baselines/reference/submodule/compiler/libTypeScriptOverrideSimple.trace.json
new file mode 100644
index 0000000000..b6e01e49bd
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/libTypeScriptOverrideSimple.trace.json
@@ -0,0 +1,19 @@
+======== Resolving module '@typescript/lib-dom' from '/.src/__lib_node_modules_lookup_lib.dom.d.ts__.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/.src/package.json' does not exist according to earlier cached lookups.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module '@typescript/lib-dom' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Directory '/.src/node_modules' does not exist, skipping all lookups in it.
+Directory '/.src/node_modules/@types' does not exist, skipping all lookups in it.
+Scoped package detected, looking in 'typescript__lib-dom'
+File '/node_modules/@typescript/lib-dom/package.json' does not exist.
+File '/node_modules/@typescript/lib-dom.ts' does not exist.
+File '/node_modules/@typescript/lib-dom.tsx' does not exist.
+File '/node_modules/@typescript/lib-dom.d.ts' does not exist.
+File '/node_modules/@typescript/lib-dom/index.ts' does not exist.
+File '/node_modules/@typescript/lib-dom/index.tsx' does not exist.
+File '/node_modules/@typescript/lib-dom/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/@typescript/lib-dom/index.d.ts', result '/node_modules/@typescript/lib-dom/index.d.ts'.
+======== Module name '@typescript/lib-dom' was successfully resolved to '/node_modules/@typescript/lib-dom/index.d.ts'. ========
diff --git a/testdata/baselines/reference/submodule/compiler/libTypeScriptOverrideSimpleConfig.trace.json b/testdata/baselines/reference/submodule/compiler/libTypeScriptOverrideSimpleConfig.trace.json
new file mode 100644
index 0000000000..baff5c90f6
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/libTypeScriptOverrideSimpleConfig.trace.json
@@ -0,0 +1,16 @@
+======== Resolving module '@typescript/lib-dom' from '/somepath/__lib_node_modules_lookup_lib.dom.d.ts__.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/somepath/package.json' does not exist according to earlier cached lookups.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module '@typescript/lib-dom' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/somepath/node_modules/@typescript/lib-dom/package.json' does not exist.
+File '/somepath/node_modules/@typescript/lib-dom.ts' does not exist.
+File '/somepath/node_modules/@typescript/lib-dom.tsx' does not exist.
+File '/somepath/node_modules/@typescript/lib-dom.d.ts' does not exist.
+File '/somepath/node_modules/@typescript/lib-dom/index.ts' does not exist.
+File '/somepath/node_modules/@typescript/lib-dom/index.tsx' does not exist.
+File '/somepath/node_modules/@typescript/lib-dom/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/somepath/node_modules/@typescript/lib-dom/index.d.ts', result '/somepath/node_modules/@typescript/lib-dom/index.d.ts'.
+======== Module name '@typescript/lib-dom' was successfully resolved to '/somepath/node_modules/@typescript/lib-dom/index.d.ts'. ========
diff --git a/testdata/baselines/reference/submodule/compiler/libTypeScriptSubfileResolving.trace.json b/testdata/baselines/reference/submodule/compiler/libTypeScriptSubfileResolving.trace.json
new file mode 100644
index 0000000000..379a5108ef
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/libTypeScriptSubfileResolving.trace.json
@@ -0,0 +1,35 @@
+======== Resolving module '@typescript/lib-dom' from '/.src/__lib_node_modules_lookup_lib.dom.d.ts__.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/.src/package.json' does not exist according to earlier cached lookups.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module '@typescript/lib-dom' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Directory '/.src/node_modules' does not exist, skipping all lookups in it.
+Directory '/.src/node_modules/@types' does not exist, skipping all lookups in it.
+Scoped package detected, looking in 'typescript__lib-dom'
+File '/node_modules/@typescript/lib-dom/package.json' does not exist.
+File '/node_modules/@typescript/lib-dom.ts' does not exist.
+File '/node_modules/@typescript/lib-dom.tsx' does not exist.
+File '/node_modules/@typescript/lib-dom.d.ts' does not exist.
+File '/node_modules/@typescript/lib-dom/index.ts' does not exist.
+File '/node_modules/@typescript/lib-dom/index.tsx' does not exist.
+File '/node_modules/@typescript/lib-dom/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/@typescript/lib-dom/index.d.ts', result '/node_modules/@typescript/lib-dom/index.d.ts'.
+======== Module name '@typescript/lib-dom' was successfully resolved to '/node_modules/@typescript/lib-dom/index.d.ts'. ========
+======== Resolving module '@typescript/lib-dom/iterable' from '/.src/__lib_node_modules_lookup_lib.dom.iterable.d.ts__.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/.src/package.json' does not exist according to earlier cached lookups.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module '@typescript/lib-dom/iterable' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Directory '/.src/node_modules' does not exist, skipping all lookups in it.
+Directory '/.src/node_modules/@types' does not exist, skipping all lookups in it.
+Scoped package detected, looking in 'typescript__lib-dom/iterable'
+File '/node_modules/@typescript/lib-dom/package.json' does not exist according to earlier cached lookups.
+File '/node_modules/@typescript/lib-dom/iterable.ts' does not exist.
+File '/node_modules/@typescript/lib-dom/iterable.tsx' does not exist.
+File '/node_modules/@typescript/lib-dom/iterable.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/@typescript/lib-dom/iterable.d.ts', result '/node_modules/@typescript/lib-dom/iterable.d.ts'.
+======== Module name '@typescript/lib-dom/iterable' was successfully resolved to '/node_modules/@typescript/lib-dom/iterable.d.ts'. ========
diff --git a/testdata/baselines/reference/submodule/compiler/libTypeScriptSubfileResolvingConfig.trace.json b/testdata/baselines/reference/submodule/compiler/libTypeScriptSubfileResolvingConfig.trace.json
new file mode 100644
index 0000000000..e0a53d77b0
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/libTypeScriptSubfileResolvingConfig.trace.json
@@ -0,0 +1,29 @@
+======== Resolving module '@typescript/lib-dom' from '/somepath/__lib_node_modules_lookup_lib.dom.d.ts__.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/somepath/package.json' does not exist according to earlier cached lookups.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module '@typescript/lib-dom' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/somepath/node_modules/@typescript/lib-dom/package.json' does not exist.
+File '/somepath/node_modules/@typescript/lib-dom.ts' does not exist.
+File '/somepath/node_modules/@typescript/lib-dom.tsx' does not exist.
+File '/somepath/node_modules/@typescript/lib-dom.d.ts' does not exist.
+File '/somepath/node_modules/@typescript/lib-dom/index.ts' does not exist.
+File '/somepath/node_modules/@typescript/lib-dom/index.tsx' does not exist.
+File '/somepath/node_modules/@typescript/lib-dom/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/somepath/node_modules/@typescript/lib-dom/index.d.ts', result '/somepath/node_modules/@typescript/lib-dom/index.d.ts'.
+======== Module name '@typescript/lib-dom' was successfully resolved to '/somepath/node_modules/@typescript/lib-dom/index.d.ts'. ========
+======== Resolving module '@typescript/lib-dom/iterable' from '/somepath/__lib_node_modules_lookup_lib.dom.iterable.d.ts__.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/somepath/package.json' does not exist according to earlier cached lookups.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module '@typescript/lib-dom/iterable' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/somepath/node_modules/@typescript/lib-dom/package.json' does not exist according to earlier cached lookups.
+File '/somepath/node_modules/@typescript/lib-dom/iterable.ts' does not exist.
+File '/somepath/node_modules/@typescript/lib-dom/iterable.tsx' does not exist.
+File '/somepath/node_modules/@typescript/lib-dom/iterable.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/somepath/node_modules/@typescript/lib-dom/iterable.d.ts', result '/somepath/node_modules/@typescript/lib-dom/iterable.d.ts'.
+======== Module name '@typescript/lib-dom/iterable' was successfully resolved to '/somepath/node_modules/@typescript/lib-dom/iterable.d.ts'. ========
diff --git a/testdata/baselines/reference/submodule/compiler/maxNodeModuleJsDepthDefaultsToZero.trace.json b/testdata/baselines/reference/submodule/compiler/maxNodeModuleJsDepthDefaultsToZero.trace.json
new file mode 100644
index 0000000000..00b638eedf
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/maxNodeModuleJsDepthDefaultsToZero.trace.json
@@ -0,0 +1,21 @@
+======== Resolving module 'shortid' from '/index.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/package.json' does not exist.
+Loading module 'shortid' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/node_modules/shortid/package.json' does not exist.
+File '/node_modules/shortid.ts' does not exist.
+File '/node_modules/shortid.tsx' does not exist.
+File '/node_modules/shortid.d.ts' does not exist.
+File '/node_modules/shortid/index.ts' does not exist.
+File '/node_modules/shortid/index.tsx' does not exist.
+File '/node_modules/shortid/index.d.ts' does not exist.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript, JSON.
+File '/node_modules/shortid/package.json' does not exist according to earlier cached lookups.
+File '/node_modules/shortid.js' does not exist.
+File '/node_modules/shortid.jsx' does not exist.
+File '/node_modules/shortid/index.js' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/shortid/index.js', result '/node_modules/shortid/index.js'.
+======== Module name 'shortid' was successfully resolved to '/node_modules/shortid/index.js'. ========
diff --git a/testdata/baselines/reference/submodule/compiler/modulePreserve2.trace.json b/testdata/baselines/reference/submodule/compiler/modulePreserve2.trace.json
new file mode 100644
index 0000000000..fdcda0f245
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/modulePreserve2.trace.json
@@ -0,0 +1,36 @@
+======== Resolving module 'dep' from '/main.js'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+File '/package.json' does not exist.
+Loading module 'dep' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Found 'package.json' at '/node_modules/dep/package.json'.
+Entering conditional exports.
+Matched 'exports' condition 'import'.
+Using 'exports' subpath '.' with target './import.mjs'.
+File name '/node_modules/dep/import.mjs' has a '.mjs' extension - stripping it.
+File '/node_modules/dep/import.mts' does not exist.
+File '/node_modules/dep/import.d.mts' exists - use it as a name resolution result.
+Resolved under condition 'import'.
+Exiting conditional exports.
+Resolving real path for '/node_modules/dep/import.d.mts', result '/node_modules/dep/import.d.mts'.
+======== Module name 'dep' was successfully resolved to '/node_modules/dep/import.d.mts'. ========
+======== Resolving module 'dep' from '/main.js'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'dep' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/node_modules/dep/package.json' exists according to earlier cached lookups.
+Entering conditional exports.
+Saw non-matching condition 'import'.
+Matched 'exports' condition 'require'.
+Using 'exports' subpath '.' with target './require.js'.
+File name '/node_modules/dep/require.js' has a '.js' extension - stripping it.
+File '/node_modules/dep/require.ts' does not exist.
+File '/node_modules/dep/require.tsx' does not exist.
+File '/node_modules/dep/require.d.ts' exists - use it as a name resolution result.
+Resolved under condition 'require'.
+Exiting conditional exports.
+Resolving real path for '/node_modules/dep/require.d.ts', result '/node_modules/dep/require.d.ts'.
+======== Module name 'dep' was successfully resolved to '/node_modules/dep/require.d.ts'. ========
diff --git a/testdata/baselines/reference/submodule/compiler/modulePreserve3.trace.json b/testdata/baselines/reference/submodule/compiler/modulePreserve3.trace.json
new file mode 100644
index 0000000000..baaaff51cd
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/modulePreserve3.trace.json
@@ -0,0 +1,24 @@
+======== Resolving module 'react/jsx-runtime' from '/index.tsx'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+File '/package.json' does not exist.
+Loading module 'react/jsx-runtime' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/node_modules/@types/react/package.json' does not exist according to earlier cached lookups.
+File '/node_modules/@types/react/jsx-runtime.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/@types/react/jsx-runtime.d.ts', result '/node_modules/@types/react/jsx-runtime.d.ts'.
+======== Module name 'react/jsx-runtime' was successfully resolved to '/node_modules/@types/react/jsx-runtime.d.ts'. ========
+======== Resolving type reference directive 'react', containing file '/.src/__inferred type names__.ts', root directory '/.src/node_modules/@types,/node_modules/@types'. ========
+Resolving with primary search path '/.src/node_modules/@types, /node_modules/@types'.
+Directory '/.src/node_modules/@types' does not exist, skipping all lookups in it.
+File '/node_modules/@types/react/package.json' does not exist.
+File '/node_modules/@types/react/index.d.ts' does not exist.
+Looking up in 'node_modules' folder, initial location '/.src'.
+Searching all ancestor node_modules directories for preferred extensions: Declaration.
+Directory '/.src/node_modules' does not exist, skipping all lookups in it.
+Directory '/.src/node_modules/@types' does not exist, skipping all lookups in it.
+File '/node_modules/react.d.ts' does not exist.
+File '/node_modules/@types/react/package.json' does not exist according to earlier cached lookups.
+File '/node_modules/@types/react.d.ts' does not exist.
+File '/node_modules/@types/react/index.d.ts' does not exist.
+======== Type reference directive 'react' was not resolved. ========
diff --git a/testdata/baselines/reference/submodule/compiler/moduleResolutionAsTypeReferenceDirective.trace.json b/testdata/baselines/reference/submodule/compiler/moduleResolutionAsTypeReferenceDirective.trace.json
new file mode 100644
index 0000000000..1014303d44
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/moduleResolutionAsTypeReferenceDirective.trace.json
@@ -0,0 +1,11 @@
+======== Resolving module 'phaser' from '/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/package.json' does not exist.
+Loading module 'phaser' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript, JSON.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+======== Module name 'phaser' was not resolved. ========
diff --git a/testdata/baselines/reference/submodule/compiler/moduleResolutionAsTypeReferenceDirectiveAmbient.trace.json b/testdata/baselines/reference/submodule/compiler/moduleResolutionAsTypeReferenceDirectiveAmbient.trace.json
new file mode 100644
index 0000000000..1014303d44
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/moduleResolutionAsTypeReferenceDirectiveAmbient.trace.json
@@ -0,0 +1,11 @@
+======== Resolving module 'phaser' from '/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/package.json' does not exist.
+Loading module 'phaser' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript, JSON.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+======== Module name 'phaser' was not resolved. ========
diff --git a/testdata/baselines/reference/submodule/compiler/moduleResolutionAsTypeReferenceDirectiveScoped.trace.json b/testdata/baselines/reference/submodule/compiler/moduleResolutionAsTypeReferenceDirectiveScoped.trace.json
new file mode 100644
index 0000000000..2b59104e4c
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/moduleResolutionAsTypeReferenceDirectiveScoped.trace.json
@@ -0,0 +1,72 @@
+======== Resolving module '@scoped/typescache' from '/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/package.json' does not exist.
+Loading module '@scoped/typescache' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Scoped package detected, looking in 'scoped__typescache'
+Searching all ancestor node_modules directories for fallback extensions: JavaScript, JSON.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+======== Module name '@scoped/typescache' was not resolved. ========
+======== Resolving module '@mangled/typescache' from '/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module '@mangled/typescache' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Scoped package detected, looking in 'mangled__typescache'
+Searching all ancestor node_modules directories for fallback extensions: JavaScript, JSON.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+======== Module name '@mangled/typescache' was not resolved. ========
+======== Resolving module '@scoped/nodemodulescache' from '/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module '@scoped/nodemodulescache' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Scoped package detected, looking in 'scoped__nodemodulescache'
+Searching all ancestor node_modules directories for fallback extensions: JavaScript, JSON.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+======== Module name '@scoped/nodemodulescache' was not resolved. ========
+======== Resolving module '@mangled/nodemodulescache' from '/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module '@mangled/nodemodulescache' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Scoped package detected, looking in 'mangled__nodemodulescache'
+Searching all ancestor node_modules directories for fallback extensions: JavaScript, JSON.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+======== Module name '@mangled/nodemodulescache' was not resolved. ========
+======== Resolving module '@scoped/attypescache' from '/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module '@scoped/attypescache' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Scoped package detected, looking in 'scoped__attypescache'
+Searching all ancestor node_modules directories for fallback extensions: JavaScript, JSON.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+======== Module name '@scoped/attypescache' was not resolved. ========
+======== Resolving module '@mangled/attypescache' from '/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module '@mangled/attypescache' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Scoped package detected, looking in 'mangled__attypescache'
+Searching all ancestor node_modules directories for fallback extensions: JavaScript, JSON.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+======== Module name '@mangled/attypescache' was not resolved. ========
diff --git a/testdata/baselines/reference/submodule/compiler/moduleResolutionPackageIdWithRelativeAndAbsolutePath.trace.json b/testdata/baselines/reference/submodule/compiler/moduleResolutionPackageIdWithRelativeAndAbsolutePath.trace.json
new file mode 100644
index 0000000000..bedfe22207
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/moduleResolutionPackageIdWithRelativeAndAbsolutePath.trace.json
@@ -0,0 +1,80 @@
+======== Resolving module 'anotherLib' from '/project/src/app.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+'paths' option is specified, looking for a pattern to match module name 'anotherLib'.
+File '/project/src/package.json' does not exist.
+File '/project/package.json' does not exist.
+File '/package.json' does not exist.
+Loading module 'anotherLib' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Directory '/project/src/node_modules' does not exist, skipping all lookups in it.
+Directory '/project/src/node_modules/@types' does not exist, skipping all lookups in it.
+File '/project/node_modules/anotherLib/package.json' does not exist.
+File '/project/node_modules/anotherLib.ts' does not exist.
+File '/project/node_modules/anotherLib.tsx' does not exist.
+File '/project/node_modules/anotherLib.d.ts' does not exist.
+File '/project/node_modules/anotherLib/index.ts' does not exist.
+File '/project/node_modules/anotherLib/index.tsx' does not exist.
+File '/project/node_modules/anotherLib/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/project/node_modules/anotherLib/index.d.ts', result '/project/node_modules/anotherLib/index.d.ts'.
+======== Module name 'anotherLib' was successfully resolved to '/project/node_modules/anotherLib/index.d.ts'. ========
+======== Resolving module '@shared/lib/app' from '/project/src/app.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+'paths' option is specified, looking for a pattern to match module name '@shared/lib/app'.
+Module name '@shared/lib/app', matched pattern '@shared/*'.
+Trying substitution '../shared/*', candidate module location: '../shared/lib/app'.
+Loading module as file / folder, candidate module location '/shared/lib/app', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/shared/lib/app.ts' does not exist.
+File '/shared/lib/app.tsx' does not exist.
+File '/shared/lib/app.d.ts' exists - use it as a name resolution result.
+======== Module name '@shared/lib/app' was successfully resolved to '/shared/lib/app.d.ts'. ========
+======== Resolving module 'troublesome-lib/lib/Compactable' from '/project/node_modules/anotherLib/index.d.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+'paths' option is specified, looking for a pattern to match module name 'troublesome-lib/lib/Compactable'.
+File '/project/node_modules/anotherLib/package.json' does not exist according to earlier cached lookups.
+File '/project/node_modules/package.json' does not exist according to earlier cached lookups.
+File '/project/package.json' does not exist according to earlier cached lookups.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'troublesome-lib/lib/Compactable' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Directory '/project/node_modules/anotherLib/node_modules' does not exist, skipping all lookups in it.
+Directory '/project/node_modules/anotherLib/node_modules/@types' does not exist, skipping all lookups in it.
+Found 'package.json' at '/project/node_modules/troublesome-lib/package.json'.
+'package.json' does not have a 'typesVersions' field.
+File '/project/node_modules/troublesome-lib/lib/Compactable.ts' does not exist.
+File '/project/node_modules/troublesome-lib/lib/Compactable.tsx' does not exist.
+File '/project/node_modules/troublesome-lib/lib/Compactable.d.ts' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolving real path for '/project/node_modules/troublesome-lib/lib/Compactable.d.ts', result '/project/node_modules/troublesome-lib/lib/Compactable.d.ts'.
+======== Module name 'troublesome-lib/lib/Compactable' was successfully resolved to '/project/node_modules/troublesome-lib/lib/Compactable.d.ts' with Package ID 'troublesome-lib@1.17.1'. ========
+======== Resolving module './Option' from '/project/node_modules/troublesome-lib/lib/Compactable.d.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+Loading module as file / folder, candidate module location '/project/node_modules/troublesome-lib/lib/Option', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/project/node_modules/troublesome-lib/lib/Option.ts' does not exist.
+File '/project/node_modules/troublesome-lib/lib/Option.tsx' does not exist.
+File '/project/node_modules/troublesome-lib/lib/Option.d.ts' exists - use it as a name resolution result.
+File '/project/node_modules/troublesome-lib/package.json' exists according to earlier cached lookups.
+'package.json' does not have a 'peerDependencies' field.
+======== Module name './Option' was successfully resolved to '/project/node_modules/troublesome-lib/lib/Option.d.ts' with Package ID 'troublesome-lib@1.17.1'. ========
+======== Resolving module 'troublesome-lib/lib/Option' from '/shared/lib/app.d.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+'paths' option is specified, looking for a pattern to match module name 'troublesome-lib/lib/Option'.
+File '/shared/lib/package.json' does not exist.
+File '/shared/package.json' does not exist.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'troublesome-lib/lib/Option' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Directory '/shared/lib/node_modules' does not exist, skipping all lookups in it.
+Directory '/shared/lib/node_modules/@types' does not exist, skipping all lookups in it.
+Found 'package.json' at '/shared/node_modules/troublesome-lib/package.json'.
+'package.json' does not have a 'typesVersions' field.
+File '/shared/node_modules/troublesome-lib/lib/Option.ts' does not exist.
+File '/shared/node_modules/troublesome-lib/lib/Option.tsx' does not exist.
+File '/shared/node_modules/troublesome-lib/lib/Option.d.ts' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolving real path for '/shared/node_modules/troublesome-lib/lib/Option.d.ts', result '/shared/node_modules/troublesome-lib/lib/Option.d.ts'.
+======== Module name 'troublesome-lib/lib/Option' was successfully resolved to '/shared/node_modules/troublesome-lib/lib/Option.d.ts' with Package ID 'troublesome-lib@1.17.1'. ========
diff --git a/testdata/baselines/reference/submodule/compiler/moduleResolutionWithExtensions_notSupported.trace.json b/testdata/baselines/reference/submodule/compiler/moduleResolutionWithExtensions_notSupported.trace.json
new file mode 100644
index 0000000000..31c2c229d2
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/moduleResolutionWithExtensions_notSupported.trace.json
@@ -0,0 +1,26 @@
+======== Resolving module './tsx' from '/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+Loading module as file / folder, candidate module location '/tsx', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/tsx.ts' does not exist.
+File '/tsx.tsx' exists - use it as a name resolution result.
+======== Module name './tsx' was successfully resolved to '/tsx.tsx'. ========
+======== Resolving module './jsx' from '/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+Loading module as file / folder, candidate module location '/jsx', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/jsx.ts' does not exist.
+File '/jsx.tsx' does not exist.
+File '/jsx.d.ts' does not exist.
+File '/jsx.js' does not exist.
+File '/jsx.jsx' exists - use it as a name resolution result.
+======== Module name './jsx' was successfully resolved to '/jsx.jsx'. ========
+======== Resolving module './js' from '/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+Loading module as file / folder, candidate module location '/js', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/js.ts' does not exist.
+File '/js.tsx' does not exist.
+File '/js.d.ts' does not exist.
+File '/js.js' exists - use it as a name resolution result.
+======== Module name './js' was successfully resolved to '/js.js'. ========
diff --git a/testdata/baselines/reference/submodule/compiler/moduleResolutionWithExtensions_notSupported2.trace.json b/testdata/baselines/reference/submodule/compiler/moduleResolutionWithExtensions_notSupported2.trace.json
new file mode 100644
index 0000000000..e200b3fbe2
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/moduleResolutionWithExtensions_notSupported2.trace.json
@@ -0,0 +1,10 @@
+======== Resolving module './jsx' from '/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+Loading module as file / folder, candidate module location '/jsx', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/jsx.ts' does not exist.
+File '/jsx.tsx' does not exist.
+File '/jsx.d.ts' does not exist.
+File '/jsx.js' does not exist.
+File '/jsx.jsx' exists - use it as a name resolution result.
+======== Module name './jsx' was successfully resolved to '/jsx.jsx'. ========
diff --git a/testdata/baselines/reference/submodule/compiler/moduleResolutionWithExtensions_notSupported3.trace.json b/testdata/baselines/reference/submodule/compiler/moduleResolutionWithExtensions_notSupported3.trace.json
new file mode 100644
index 0000000000..e200b3fbe2
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/moduleResolutionWithExtensions_notSupported3.trace.json
@@ -0,0 +1,10 @@
+======== Resolving module './jsx' from '/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+Loading module as file / folder, candidate module location '/jsx', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/jsx.ts' does not exist.
+File '/jsx.tsx' does not exist.
+File '/jsx.d.ts' does not exist.
+File '/jsx.js' does not exist.
+File '/jsx.jsx' exists - use it as a name resolution result.
+======== Module name './jsx' was successfully resolved to '/jsx.jsx'. ========
diff --git a/testdata/baselines/reference/submodule/compiler/moduleResolutionWithExtensions_unexpected.trace.json b/testdata/baselines/reference/submodule/compiler/moduleResolutionWithExtensions_unexpected.trace.json
new file mode 100644
index 0000000000..0f988ca942
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/moduleResolutionWithExtensions_unexpected.trace.json
@@ -0,0 +1,45 @@
+======== Resolving module 'normalize.css' from '/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/package.json' does not exist.
+Loading module 'normalize.css' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Found 'package.json' at '/node_modules/normalize.css/package.json'.
+File name '/node_modules/normalize.css' has a '.css' extension - stripping it.
+File '/node_modules/normalize.d.css.ts' does not exist.
+File '/node_modules/normalize.css.ts' does not exist.
+File '/node_modules/normalize.css.tsx' does not exist.
+File '/node_modules/normalize.css.d.ts' does not exist.
+'package.json' does not have a 'typesVersions' field.
+'package.json' does not have a 'typings' field.
+'package.json' does not have a 'types' field.
+'package.json' has 'main' field 'normalize.css' that references '/node_modules/normalize.css/normalize.css'.
+File name '/node_modules/normalize.css/normalize.css' has a '.css' extension - stripping it.
+File '/node_modules/normalize.css/normalize.d.css.ts' does not exist.
+Loading module as file / folder, candidate module location '/node_modules/normalize.css/normalize.css', target file types: TypeScript, Declaration.
+File name '/node_modules/normalize.css/normalize.css' has a '.css' extension - stripping it.
+File '/node_modules/normalize.css/normalize.d.css.ts' does not exist.
+File '/node_modules/normalize.css/normalize.css.ts' does not exist.
+File '/node_modules/normalize.css/normalize.css.tsx' does not exist.
+File '/node_modules/normalize.css/normalize.css.d.ts' does not exist.
+Directory '/node_modules/normalize.css/normalize.css' does not exist, skipping all lookups in it.
+File '/node_modules/normalize.css/index.ts' does not exist.
+File '/node_modules/normalize.css/index.tsx' does not exist.
+File '/node_modules/normalize.css/index.d.ts' does not exist.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+File name '/node_modules/@types/normalize.css' has a '.css' extension - stripping it.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript, JSON.
+File '/node_modules/normalize.css/package.json' exists according to earlier cached lookups.
+File name '/node_modules/normalize.css' has a '.css' extension - stripping it.
+File '/node_modules/normalize.css.js' does not exist.
+File '/node_modules/normalize.css.jsx' does not exist.
+'package.json' has 'main' field 'normalize.css' that references '/node_modules/normalize.css/normalize.css'.
+File name '/node_modules/normalize.css/normalize.css' has a '.css' extension - stripping it.
+Loading module as file / folder, candidate module location '/node_modules/normalize.css/normalize.css', target file types: JavaScript, JSON.
+File name '/node_modules/normalize.css/normalize.css' has a '.css' extension - stripping it.
+File '/node_modules/normalize.css/normalize.css.js' does not exist.
+File '/node_modules/normalize.css/normalize.css.jsx' does not exist.
+Directory '/node_modules/normalize.css/normalize.css' does not exist, skipping all lookups in it.
+File '/node_modules/normalize.css/index.js' does not exist.
+File '/node_modules/normalize.css/index.jsx' does not exist.
+======== Module name 'normalize.css' was not resolved. ========
diff --git a/testdata/baselines/reference/submodule/compiler/moduleResolutionWithExtensions_unexpected2.trace.json b/testdata/baselines/reference/submodule/compiler/moduleResolutionWithExtensions_unexpected2.trace.json
new file mode 100644
index 0000000000..73cb649747
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/moduleResolutionWithExtensions_unexpected2.trace.json
@@ -0,0 +1,38 @@
+======== Resolving module 'foo' from '/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/package.json' does not exist.
+Loading module 'foo' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Found 'package.json' at '/node_modules/foo/package.json'.
+File '/node_modules/foo.ts' does not exist.
+File '/node_modules/foo.tsx' does not exist.
+File '/node_modules/foo.d.ts' does not exist.
+'package.json' does not have a 'typesVersions' field.
+'package.json' does not have a 'typings' field.
+'package.json' has 'types' field 'foo.js' that references '/node_modules/foo/foo.js'.
+File name '/node_modules/foo/foo.js' has a '.js' extension - stripping it.
+File '/node_modules/foo/foo.ts' does not exist.
+File '/node_modules/foo/foo.tsx' does not exist.
+File '/node_modules/foo/foo.d.ts' does not exist.
+Loading module as file / folder, candidate module location '/node_modules/foo/foo.js', target file types: TypeScript, Declaration.
+File name '/node_modules/foo/foo.js' has a '.js' extension - stripping it.
+File '/node_modules/foo/foo.ts' does not exist.
+File '/node_modules/foo/foo.tsx' does not exist.
+File '/node_modules/foo/foo.d.ts' does not exist.
+File '/node_modules/foo/foo.js.ts' does not exist.
+File '/node_modules/foo/foo.js.tsx' does not exist.
+File '/node_modules/foo/foo.js.d.ts' does not exist.
+Directory '/node_modules/foo/foo.js' does not exist, skipping all lookups in it.
+File '/node_modules/foo/index.ts' does not exist.
+File '/node_modules/foo/index.tsx' does not exist.
+File '/node_modules/foo/index.d.ts' does not exist.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript, JSON.
+File '/node_modules/foo/package.json' exists according to earlier cached lookups.
+File '/node_modules/foo.js' does not exist.
+File '/node_modules/foo.jsx' does not exist.
+'package.json' does not have a 'main' field.
+File '/node_modules/foo/index.js' does not exist.
+File '/node_modules/foo/index.jsx' does not exist.
+======== Module name 'foo' was not resolved. ========
diff --git a/testdata/baselines/reference/submodule/compiler/moduleResolutionWithExtensions_withAmbientPresent.trace.json b/testdata/baselines/reference/submodule/compiler/moduleResolutionWithExtensions_withAmbientPresent.trace.json
new file mode 100644
index 0000000000..40cd512bdd
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/moduleResolutionWithExtensions_withAmbientPresent.trace.json
@@ -0,0 +1,21 @@
+======== Resolving module 'js' from '/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/package.json' does not exist.
+Loading module 'js' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/node_modules/js/package.json' does not exist.
+File '/node_modules/js.ts' does not exist.
+File '/node_modules/js.tsx' does not exist.
+File '/node_modules/js.d.ts' does not exist.
+File '/node_modules/js/index.ts' does not exist.
+File '/node_modules/js/index.tsx' does not exist.
+File '/node_modules/js/index.d.ts' does not exist.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript, JSON.
+File '/node_modules/js/package.json' does not exist according to earlier cached lookups.
+File '/node_modules/js.js' does not exist.
+File '/node_modules/js.jsx' does not exist.
+File '/node_modules/js/index.js' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/js/index.js', result '/node_modules/js/index.js'.
+======== Module name 'js' was successfully resolved to '/node_modules/js/index.js'. ========
diff --git a/testdata/baselines/reference/submodule/compiler/moduleResolutionWithExtensions_withPaths.trace.json b/testdata/baselines/reference/submodule/compiler/moduleResolutionWithExtensions_withPaths.trace.json
new file mode 100644
index 0000000000..313e5dc896
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/moduleResolutionWithExtensions_withPaths.trace.json
@@ -0,0 +1,44 @@
+======== Resolving module 'foo/test.js' from '/test.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+'paths' option is specified, looking for a pattern to match module name 'foo/test.js'.
+Module name 'foo/test.js', matched pattern 'foo/*'.
+Trying substitution 'node_modules/foo/lib/*', candidate module location: 'node_modules/foo/lib/test.js'.
+Loading module as file / folder, candidate module location '/node_modules/foo/lib/test.js', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/node_modules/foo/lib/test.js' has a '.js' extension - stripping it.
+File '/node_modules/foo/lib/test.ts' does not exist.
+File '/node_modules/foo/lib/test.tsx' does not exist.
+File '/node_modules/foo/lib/test.d.ts' exists - use it as a name resolution result.
+File '/node_modules/foo/package.json' does not exist.
+Resolving real path for '/node_modules/foo/lib/test.d.ts', result '/node_modules/foo/lib/test.d.ts'.
+======== Module name 'foo/test.js' was successfully resolved to '/node_modules/foo/lib/test.d.ts'. ========
+======== Resolving module 'foo/test' from '/test.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+'paths' option is specified, looking for a pattern to match module name 'foo/test'.
+Module name 'foo/test', matched pattern 'foo/*'.
+Trying substitution 'node_modules/foo/lib/*', candidate module location: 'node_modules/foo/lib/test'.
+Loading module as file / folder, candidate module location '/node_modules/foo/lib/test', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/node_modules/foo/lib/test.ts' does not exist.
+File '/node_modules/foo/lib/test.tsx' does not exist.
+File '/node_modules/foo/lib/test.d.ts' exists - use it as a name resolution result.
+File '/node_modules/foo/package.json' does not exist according to earlier cached lookups.
+Resolving real path for '/node_modules/foo/lib/test.d.ts', result '/node_modules/foo/lib/test.d.ts'.
+======== Module name 'foo/test' was successfully resolved to '/node_modules/foo/lib/test.d.ts'. ========
+======== Resolving module './relative.js' from '/test.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/relative.js', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/relative.js' has a '.js' extension - stripping it.
+File '/relative.ts' does not exist.
+File '/relative.tsx' does not exist.
+File '/relative.d.ts' exists - use it as a name resolution result.
+======== Module name './relative.js' was successfully resolved to '/relative.d.ts'. ========
+======== Resolving module './relative' from '/test.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/relative', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/relative.ts' does not exist.
+File '/relative.tsx' does not exist.
+File '/relative.d.ts' exists - use it as a name resolution result.
+======== Module name './relative' was successfully resolved to '/relative.d.ts'. ========
diff --git a/testdata/baselines/reference/submodule/compiler/moduleResolutionWithRequireAndImport.trace.json b/testdata/baselines/reference/submodule/compiler/moduleResolutionWithRequireAndImport.trace.json
new file mode 100644
index 0000000000..97ef80bade
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/moduleResolutionWithRequireAndImport.trace.json
@@ -0,0 +1,6 @@
+======== Resolving module './other' from '/index.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+Loading module as file / folder, candidate module location '/other', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/other.ts' exists - use it as a name resolution result.
+======== Module name './other' was successfully resolved to '/other.ts'. ========
diff --git a/testdata/baselines/reference/submodule/compiler/moduleResolutionWithSuffixes_empty.trace.json b/testdata/baselines/reference/submodule/compiler/moduleResolutionWithSuffixes_empty.trace.json
new file mode 100644
index 0000000000..12c67c71be
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/moduleResolutionWithSuffixes_empty.trace.json
@@ -0,0 +1,6 @@
+======== Resolving module './foo' from '/index.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+Loading module as file / folder, candidate module location '/foo', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/foo.ts' exists - use it as a name resolution result.
+======== Module name './foo' was successfully resolved to '/foo.ts'. ========
diff --git a/testdata/baselines/reference/submodule/compiler/moduleResolutionWithSuffixes_notSpecified.trace.json b/testdata/baselines/reference/submodule/compiler/moduleResolutionWithSuffixes_notSpecified.trace.json
new file mode 100644
index 0000000000..12c67c71be
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/moduleResolutionWithSuffixes_notSpecified.trace.json
@@ -0,0 +1,6 @@
+======== Resolving module './foo' from '/index.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+Loading module as file / folder, candidate module location '/foo', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/foo.ts' exists - use it as a name resolution result.
+======== Module name './foo' was successfully resolved to '/foo.ts'. ========
diff --git a/testdata/baselines/reference/submodule/compiler/moduleResolutionWithSuffixes_one.trace.json b/testdata/baselines/reference/submodule/compiler/moduleResolutionWithSuffixes_one.trace.json
new file mode 100644
index 0000000000..bbef3f7e73
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/moduleResolutionWithSuffixes_one.trace.json
@@ -0,0 +1,6 @@
+======== Resolving module './foo' from '/index.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+Loading module as file / folder, candidate module location '/foo', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/foo.ios.ts' exists - use it as a name resolution result.
+======== Module name './foo' was successfully resolved to '/foo.ios.ts'. ========
diff --git a/testdata/baselines/reference/submodule/compiler/moduleResolutionWithSuffixes_oneBlank.trace.json b/testdata/baselines/reference/submodule/compiler/moduleResolutionWithSuffixes_oneBlank.trace.json
new file mode 100644
index 0000000000..12c67c71be
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/moduleResolutionWithSuffixes_oneBlank.trace.json
@@ -0,0 +1,6 @@
+======== Resolving module './foo' from '/index.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+Loading module as file / folder, candidate module location '/foo', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/foo.ts' exists - use it as a name resolution result.
+======== Module name './foo' was successfully resolved to '/foo.ts'. ========
diff --git a/testdata/baselines/reference/submodule/compiler/moduleResolutionWithSuffixes_oneNotFound.trace.json b/testdata/baselines/reference/submodule/compiler/moduleResolutionWithSuffixes_oneNotFound.trace.json
new file mode 100644
index 0000000000..7c6529e6a9
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/moduleResolutionWithSuffixes_oneNotFound.trace.json
@@ -0,0 +1,11 @@
+======== Resolving module './foo' from '/index.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+Loading module as file / folder, candidate module location '/foo', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/foo.ios.ts' does not exist.
+File '/foo.ios.tsx' does not exist.
+File '/foo.ios.d.ts' does not exist.
+File '/foo.ios.js' does not exist.
+File '/foo.ios.jsx' does not exist.
+Directory '/foo' does not exist, skipping all lookups in it.
+======== Module name './foo' was not resolved. ========
diff --git a/testdata/baselines/reference/submodule/compiler/moduleResolutionWithSuffixes_one_dirModuleWithIndex.trace.json b/testdata/baselines/reference/submodule/compiler/moduleResolutionWithSuffixes_one_dirModuleWithIndex.trace.json
new file mode 100644
index 0000000000..f8e9732928
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/moduleResolutionWithSuffixes_one_dirModuleWithIndex.trace.json
@@ -0,0 +1,12 @@
+======== Resolving module './foo' from '/index.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+Loading module as file / folder, candidate module location '/foo', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/foo.ios.ts' does not exist.
+File '/foo.ios.tsx' does not exist.
+File '/foo.ios.d.ts' does not exist.
+File '/foo.ios.js' does not exist.
+File '/foo.ios.jsx' does not exist.
+File '/foo/package.json' does not exist.
+File '/foo/index.ios.ts' exists - use it as a name resolution result.
+======== Module name './foo' was successfully resolved to '/foo/index.ios.ts'. ========
diff --git a/testdata/baselines/reference/submodule/compiler/moduleResolutionWithSuffixes_one_externalModule.trace.json b/testdata/baselines/reference/submodule/compiler/moduleResolutionWithSuffixes_one_externalModule.trace.json
new file mode 100644
index 0000000000..fc40eb09fd
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/moduleResolutionWithSuffixes_one_externalModule.trace.json
@@ -0,0 +1,15 @@
+======== Resolving module 'some-library' from '/index.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/package.json' does not exist.
+Loading module 'some-library' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/node_modules/some-library/package.json' does not exist.
+File '/node_modules/some-library.ios.ts' does not exist.
+File '/node_modules/some-library.ios.tsx' does not exist.
+File '/node_modules/some-library.ios.d.ts' does not exist.
+File '/node_modules/some-library/index.ios.ts' does not exist.
+File '/node_modules/some-library/index.ios.tsx' does not exist.
+File '/node_modules/some-library/index.ios.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/some-library/index.ios.d.ts', result '/node_modules/some-library/index.ios.d.ts'.
+======== Module name 'some-library' was successfully resolved to '/node_modules/some-library/index.ios.d.ts'. ========
diff --git a/testdata/baselines/reference/submodule/compiler/moduleResolutionWithSuffixes_one_externalModulePath.trace.json b/testdata/baselines/reference/submodule/compiler/moduleResolutionWithSuffixes_one_externalModulePath.trace.json
new file mode 100644
index 0000000000..ea9a1c0669
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/moduleResolutionWithSuffixes_one_externalModulePath.trace.json
@@ -0,0 +1,12 @@
+======== Resolving module 'some-library/foo' from '/index.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/package.json' does not exist.
+Loading module 'some-library/foo' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/node_modules/some-library/package.json' does not exist.
+File '/node_modules/some-library/foo.ios.ts' does not exist.
+File '/node_modules/some-library/foo.ios.tsx' does not exist.
+File '/node_modules/some-library/foo.ios.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/some-library/foo.ios.d.ts', result '/node_modules/some-library/foo.ios.d.ts'.
+======== Module name 'some-library/foo' was successfully resolved to '/node_modules/some-library/foo.ios.d.ts'. ========
diff --git a/testdata/baselines/reference/submodule/compiler/moduleResolutionWithSuffixes_one_externalModule_withPaths.trace.json b/testdata/baselines/reference/submodule/compiler/moduleResolutionWithSuffixes_one_externalModule_withPaths.trace.json
new file mode 100644
index 0000000000..ec7572e66e
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/moduleResolutionWithSuffixes_one_externalModule_withPaths.trace.json
@@ -0,0 +1,45 @@
+======== Resolving module 'some-library' from '/test.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+'paths' option is specified, looking for a pattern to match module name 'some-library'.
+Module name 'some-library', matched pattern 'some-library'.
+Trying substitution 'node_modules/some-library/lib', candidate module location: 'node_modules/some-library/lib'.
+Loading module as file / folder, candidate module location '/node_modules/some-library/lib', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/node_modules/some-library/lib.ios.ts' does not exist.
+File '/node_modules/some-library/lib.ios.tsx' does not exist.
+File '/node_modules/some-library/lib.ios.d.ts' does not exist.
+File '/node_modules/some-library/lib.ios.js' does not exist.
+File '/node_modules/some-library/lib.ios.jsx' does not exist.
+File '/node_modules/some-library/lib/package.json' does not exist.
+File '/node_modules/some-library/lib/index.ios.ts' does not exist.
+File '/node_modules/some-library/lib/index.ios.tsx' does not exist.
+File '/node_modules/some-library/lib/index.ios.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/some-library/lib/index.ios.d.ts', result '/node_modules/some-library/lib/index.ios.d.ts'.
+======== Module name 'some-library' was successfully resolved to '/node_modules/some-library/lib/index.ios.d.ts'. ========
+======== Resolving module 'some-library/index' from '/test.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+'paths' option is specified, looking for a pattern to match module name 'some-library/index'.
+Module name 'some-library/index', matched pattern 'some-library/*'.
+Trying substitution 'node_modules/some-library/lib/*', candidate module location: 'node_modules/some-library/lib/index'.
+Loading module as file / folder, candidate module location '/node_modules/some-library/lib/index', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/node_modules/some-library/lib/index.ios.ts' does not exist.
+File '/node_modules/some-library/lib/index.ios.tsx' does not exist.
+File '/node_modules/some-library/lib/index.ios.d.ts' exists - use it as a name resolution result.
+File '/node_modules/some-library/package.json' does not exist.
+Resolving real path for '/node_modules/some-library/lib/index.ios.d.ts', result '/node_modules/some-library/lib/index.ios.d.ts'.
+======== Module name 'some-library/index' was successfully resolved to '/node_modules/some-library/lib/index.ios.d.ts'. ========
+======== Resolving module 'some-library/index.js' from '/test.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+'paths' option is specified, looking for a pattern to match module name 'some-library/index.js'.
+Module name 'some-library/index.js', matched pattern 'some-library/*'.
+Trying substitution 'node_modules/some-library/lib/*', candidate module location: 'node_modules/some-library/lib/index.js'.
+Loading module as file / folder, candidate module location '/node_modules/some-library/lib/index.js', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/node_modules/some-library/lib/index.js' has a '.js' extension - stripping it.
+File '/node_modules/some-library/lib/index.ios.ts' does not exist.
+File '/node_modules/some-library/lib/index.ios.tsx' does not exist.
+File '/node_modules/some-library/lib/index.ios.d.ts' exists - use it as a name resolution result.
+File '/node_modules/some-library/package.json' does not exist according to earlier cached lookups.
+Resolving real path for '/node_modules/some-library/lib/index.ios.d.ts', result '/node_modules/some-library/lib/index.ios.d.ts'.
+======== Module name 'some-library/index.js' was successfully resolved to '/node_modules/some-library/lib/index.ios.d.ts'. ========
diff --git a/testdata/baselines/reference/submodule/compiler/moduleResolutionWithSuffixes_one_externalTSModule.trace.json b/testdata/baselines/reference/submodule/compiler/moduleResolutionWithSuffixes_one_externalTSModule.trace.json
new file mode 100644
index 0000000000..a468e7dde0
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/moduleResolutionWithSuffixes_one_externalTSModule.trace.json
@@ -0,0 +1,13 @@
+======== Resolving module 'some-library' from '/test.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/package.json' does not exist.
+Loading module 'some-library' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/node_modules/some-library/package.json' does not exist.
+File '/node_modules/some-library.ios.ts' does not exist.
+File '/node_modules/some-library.ios.tsx' does not exist.
+File '/node_modules/some-library.ios.d.ts' does not exist.
+File '/node_modules/some-library/index.ios.ts' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/some-library/index.ios.ts', result '/node_modules/some-library/index.ios.ts'.
+======== Module name 'some-library' was successfully resolved to '/node_modules/some-library/index.ios.ts'. ========
diff --git a/testdata/baselines/reference/submodule/compiler/moduleResolutionWithSuffixes_one_jsModule.trace.json b/testdata/baselines/reference/submodule/compiler/moduleResolutionWithSuffixes_one_jsModule.trace.json
new file mode 100644
index 0000000000..60619ae53c
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/moduleResolutionWithSuffixes_one_jsModule.trace.json
@@ -0,0 +1,10 @@
+======== Resolving module './foo.js' from '/index.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+Loading module as file / folder, candidate module location '/foo.js', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/foo.js' has a '.js' extension - stripping it.
+File '/foo.ios.ts' does not exist.
+File '/foo.ios.tsx' does not exist.
+File '/foo.ios.d.ts' does not exist.
+File '/foo.ios.js' exists - use it as a name resolution result.
+======== Module name './foo.js' was successfully resolved to '/foo.ios.js'. ========
diff --git a/testdata/baselines/reference/submodule/compiler/moduleResolutionWithSuffixes_one_jsonModule.trace.json b/testdata/baselines/reference/submodule/compiler/moduleResolutionWithSuffixes_one_jsonModule.trace.json
new file mode 100644
index 0000000000..fd456e1ae6
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/moduleResolutionWithSuffixes_one_jsonModule.trace.json
@@ -0,0 +1,8 @@
+======== Resolving module './foo.json' from '/index.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+Loading module as file / folder, candidate module location '/foo.json', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/foo.json' has a '.json' extension - stripping it.
+File '/foo.d.json.ios.ts' does not exist.
+File '/foo.ios.json' exists - use it as a name resolution result.
+======== Module name './foo.json' was successfully resolved to '/foo.ios.json'. ========
diff --git a/testdata/baselines/reference/submodule/compiler/moduleResolutionWithSuffixes_threeLastIsBlank1.trace.json b/testdata/baselines/reference/submodule/compiler/moduleResolutionWithSuffixes_threeLastIsBlank1.trace.json
new file mode 100644
index 0000000000..721a88d1e6
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/moduleResolutionWithSuffixes_threeLastIsBlank1.trace.json
@@ -0,0 +1,6 @@
+======== Resolving module './foo' from '/index.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+Loading module as file / folder, candidate module location '/foo', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/foo-ios.ts' exists - use it as a name resolution result.
+======== Module name './foo' was successfully resolved to '/foo-ios.ts'. ========
diff --git a/testdata/baselines/reference/submodule/compiler/moduleResolutionWithSuffixes_threeLastIsBlank2.trace.json b/testdata/baselines/reference/submodule/compiler/moduleResolutionWithSuffixes_threeLastIsBlank2.trace.json
new file mode 100644
index 0000000000..f6e7ec2000
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/moduleResolutionWithSuffixes_threeLastIsBlank2.trace.json
@@ -0,0 +1,7 @@
+======== Resolving module './foo' from '/index.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+Loading module as file / folder, candidate module location '/foo', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/foo-ios.ts' does not exist.
+File '/foo__native.ts' exists - use it as a name resolution result.
+======== Module name './foo' was successfully resolved to '/foo__native.ts'. ========
diff --git a/testdata/baselines/reference/submodule/compiler/moduleResolutionWithSuffixes_threeLastIsBlank3.trace.json b/testdata/baselines/reference/submodule/compiler/moduleResolutionWithSuffixes_threeLastIsBlank3.trace.json
new file mode 100644
index 0000000000..82b0a57168
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/moduleResolutionWithSuffixes_threeLastIsBlank3.trace.json
@@ -0,0 +1,8 @@
+======== Resolving module './foo' from '/index.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+Loading module as file / folder, candidate module location '/foo', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/foo-ios.ts' does not exist.
+File '/foo__native.ts' does not exist.
+File '/foo.ts' exists - use it as a name resolution result.
+======== Module name './foo' was successfully resolved to '/foo.ts'. ========
diff --git a/testdata/baselines/reference/submodule/compiler/moduleResolutionWithSuffixes_threeLastIsBlank4.trace.json b/testdata/baselines/reference/submodule/compiler/moduleResolutionWithSuffixes_threeLastIsBlank4.trace.json
new file mode 100644
index 0000000000..3239f2986b
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/moduleResolutionWithSuffixes_threeLastIsBlank4.trace.json
@@ -0,0 +1,21 @@
+======== Resolving module './foo' from '/index.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+Loading module as file / folder, candidate module location '/foo', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/foo-ios.ts' does not exist.
+File '/foo__native.ts' does not exist.
+File '/foo.ts' does not exist.
+File '/foo-ios.tsx' does not exist.
+File '/foo__native.tsx' does not exist.
+File '/foo.tsx' does not exist.
+File '/foo-ios.d.ts' does not exist.
+File '/foo__native.d.ts' does not exist.
+File '/foo.d.ts' does not exist.
+File '/foo-ios.js' does not exist.
+File '/foo__native.js' does not exist.
+File '/foo.js' does not exist.
+File '/foo-ios.jsx' does not exist.
+File '/foo__native.jsx' does not exist.
+File '/foo.jsx' does not exist.
+Directory '/foo' does not exist, skipping all lookups in it.
+======== Module name './foo' was not resolved. ========
diff --git a/testdata/baselines/reference/submodule/compiler/moduleResolutionWithSymlinks.trace.json b/testdata/baselines/reference/submodule/compiler/moduleResolutionWithSymlinks.trace.json
new file mode 100644
index 0000000000..63e69508e4
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/moduleResolutionWithSymlinks.trace.json
@@ -0,0 +1,43 @@
+======== Resolving module './library-a' from '/src/app.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+Loading module as file / folder, candidate module location '/src/library-a', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/src/library-a.ts' does not exist.
+File '/src/library-a.tsx' does not exist.
+File '/src/library-a.d.ts' does not exist.
+File '/src/library-a.js' does not exist.
+File '/src/library-a.jsx' does not exist.
+File '/src/library-a/package.json' does not exist.
+File '/src/library-a/index.ts' exists - use it as a name resolution result.
+======== Module name './library-a' was successfully resolved to '/src/library-a/index.ts'. ========
+======== Resolving module './library-b' from '/src/app.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+Loading module as file / folder, candidate module location '/src/library-b', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/src/library-b.ts' does not exist.
+File '/src/library-b.tsx' does not exist.
+File '/src/library-b.d.ts' does not exist.
+File '/src/library-b.js' does not exist.
+File '/src/library-b.jsx' does not exist.
+File '/src/library-b/package.json' does not exist.
+File '/src/library-b/index.ts' exists - use it as a name resolution result.
+======== Module name './library-b' was successfully resolved to '/src/library-b/index.ts'. ========
+======== Resolving module 'library-a' from '/src/library-b/index.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/src/library-b/package.json' does not exist according to earlier cached lookups.
+File '/src/package.json' does not exist.
+File '/package.json' does not exist.
+Loading module 'library-a' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Directory '/src/library-b/node_modules' does not exist, skipping all lookups in it.
+Directory '/src/library-b/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/src/node_modules' does not exist, skipping all lookups in it.
+Directory '/src/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript, JSON.
+Directory '/src/library-b/node_modules' does not exist, skipping all lookups in it.
+Directory '/src/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+======== Module name 'library-a' was not resolved. ========
diff --git a/testdata/baselines/reference/submodule/compiler/moduleResolutionWithSymlinks_notInNodeModules.trace.json b/testdata/baselines/reference/submodule/compiler/moduleResolutionWithSymlinks_notInNodeModules.trace.json
new file mode 100644
index 0000000000..9ba9957f76
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/moduleResolutionWithSymlinks_notInNodeModules.trace.json
@@ -0,0 +1,12 @@
+======== Resolving module './shared/abc' from '/src/app.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+Loading module as file / folder, candidate module location '/src/shared/abc', target file types: TypeScript, JavaScript, Declaration, JSON.
+Directory '/src/shared' does not exist, skipping all lookups in it.
+======== Module name './shared/abc' was not resolved. ========
+======== Resolving module './shared2/abc' from '/src/app.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+Loading module as file / folder, candidate module location '/src/shared2/abc', target file types: TypeScript, JavaScript, Declaration, JSON.
+Directory '/src/shared2' does not exist, skipping all lookups in it.
+======== Module name './shared2/abc' was not resolved. ========
diff --git a/testdata/baselines/reference/submodule/compiler/moduleResolutionWithSymlinks_preserveSymlinks.trace.json b/testdata/baselines/reference/submodule/compiler/moduleResolutionWithSymlinks_preserveSymlinks.trace.json
new file mode 100644
index 0000000000..9b672ff4f7
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/moduleResolutionWithSymlinks_preserveSymlinks.trace.json
@@ -0,0 +1,47 @@
+======== Resolving type reference directive 'linked', containing file '/app/app.ts', root directory '/.src/node_modules/@types,/node_modules/@types'. ========
+Resolving with primary search path '/.src/node_modules/@types, /node_modules/@types'.
+Directory '/.src/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Looking up in 'node_modules' folder, initial location '/app'.
+Searching all ancestor node_modules directories for preferred extensions: Declaration.
+File '/app/node_modules/linked.d.ts' does not exist.
+Directory '/app/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+======== Type reference directive 'linked' was not resolved. ========
+======== Resolving module 'linked' from '/app/app.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/app/package.json' does not exist.
+File '/package.json' does not exist.
+Loading module 'linked' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/app/node_modules/linked.ts' does not exist.
+File '/app/node_modules/linked.tsx' does not exist.
+File '/app/node_modules/linked.d.ts' does not exist.
+Directory '/app/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript, JSON.
+File '/app/node_modules/linked.js' does not exist.
+File '/app/node_modules/linked.jsx' does not exist.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+======== Module name 'linked' was not resolved. ========
+======== Resolving module 'linked2' from '/app/app.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/app/package.json' does not exist according to earlier cached lookups.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'linked2' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/app/node_modules/linked2.ts' does not exist.
+File '/app/node_modules/linked2.tsx' does not exist.
+File '/app/node_modules/linked2.d.ts' does not exist.
+Directory '/app/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript, JSON.
+File '/app/node_modules/linked2.js' does not exist.
+File '/app/node_modules/linked2.jsx' does not exist.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+======== Module name 'linked2' was not resolved. ========
diff --git a/testdata/baselines/reference/submodule/compiler/moduleResolutionWithSymlinks_referenceTypes.trace.json b/testdata/baselines/reference/submodule/compiler/moduleResolutionWithSymlinks_referenceTypes.trace.json
new file mode 100644
index 0000000000..737c432621
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/moduleResolutionWithSymlinks_referenceTypes.trace.json
@@ -0,0 +1,34 @@
+======== Resolving type reference directive 'library-a', containing file '/app.ts', root directory ''. ========
+Root directory cannot be determined, skipping primary search paths.
+Looking up in 'node_modules' folder, initial location '/'.
+Searching all ancestor node_modules directories for preferred extensions: Declaration.
+File '/node_modules/library-a.d.ts' does not exist.
+File '/node_modules/@types/library-a/package.json' does not exist.
+File '/node_modules/@types/library-a.d.ts' does not exist.
+File '/node_modules/@types/library-a/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/@types/library-a/index.d.ts', result '/node_modules/@types/library-a/index.d.ts'.
+======== Type reference directive 'library-a' was successfully resolved to '/node_modules/@types/library-a/index.d.ts', primary: false. ========
+======== Resolving type reference directive 'library-b', containing file '/app.ts', root directory ''. ========
+Root directory cannot be determined, skipping primary search paths.
+Looking up in 'node_modules' folder, initial location '/'.
+Searching all ancestor node_modules directories for preferred extensions: Declaration.
+File '/node_modules/library-b.d.ts' does not exist.
+File '/node_modules/@types/library-b/package.json' does not exist.
+File '/node_modules/@types/library-b.d.ts' does not exist.
+File '/node_modules/@types/library-b/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/@types/library-b/index.d.ts', result '/node_modules/@types/library-b/index.d.ts'.
+======== Type reference directive 'library-b' was successfully resolved to '/node_modules/@types/library-b/index.d.ts', primary: false. ========
+======== Resolving type reference directive 'library-a', containing file '/node_modules/@types/library-b/index.d.ts', root directory ''. ========
+Root directory cannot be determined, skipping primary search paths.
+Looking up in 'node_modules' folder, initial location '/node_modules/@types/library-b'.
+Searching all ancestor node_modules directories for preferred extensions: Declaration.
+Directory '/node_modules/@types/library-b/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules/@types/library-b/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/node_modules/@types/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules/@types/node_modules/@types' does not exist, skipping all lookups in it.
+File '/node_modules/library-a.d.ts' does not exist.
+File '/node_modules/@types/library-a/package.json' does not exist according to earlier cached lookups.
+File '/node_modules/@types/library-a.d.ts' does not exist.
+File '/node_modules/@types/library-a/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/@types/library-a/index.d.ts', result '/node_modules/@types/library-a/index.d.ts'.
+======== Type reference directive 'library-a' was successfully resolved to '/node_modules/@types/library-a/index.d.ts', primary: false. ========
diff --git a/testdata/baselines/reference/submodule/compiler/moduleResolutionWithSymlinks_withOutDir.trace.json b/testdata/baselines/reference/submodule/compiler/moduleResolutionWithSymlinks_withOutDir.trace.json
new file mode 100644
index 0000000000..63e69508e4
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/moduleResolutionWithSymlinks_withOutDir.trace.json
@@ -0,0 +1,43 @@
+======== Resolving module './library-a' from '/src/app.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+Loading module as file / folder, candidate module location '/src/library-a', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/src/library-a.ts' does not exist.
+File '/src/library-a.tsx' does not exist.
+File '/src/library-a.d.ts' does not exist.
+File '/src/library-a.js' does not exist.
+File '/src/library-a.jsx' does not exist.
+File '/src/library-a/package.json' does not exist.
+File '/src/library-a/index.ts' exists - use it as a name resolution result.
+======== Module name './library-a' was successfully resolved to '/src/library-a/index.ts'. ========
+======== Resolving module './library-b' from '/src/app.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+Loading module as file / folder, candidate module location '/src/library-b', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/src/library-b.ts' does not exist.
+File '/src/library-b.tsx' does not exist.
+File '/src/library-b.d.ts' does not exist.
+File '/src/library-b.js' does not exist.
+File '/src/library-b.jsx' does not exist.
+File '/src/library-b/package.json' does not exist.
+File '/src/library-b/index.ts' exists - use it as a name resolution result.
+======== Module name './library-b' was successfully resolved to '/src/library-b/index.ts'. ========
+======== Resolving module 'library-a' from '/src/library-b/index.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/src/library-b/package.json' does not exist according to earlier cached lookups.
+File '/src/package.json' does not exist.
+File '/package.json' does not exist.
+Loading module 'library-a' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Directory '/src/library-b/node_modules' does not exist, skipping all lookups in it.
+Directory '/src/library-b/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/src/node_modules' does not exist, skipping all lookups in it.
+Directory '/src/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript, JSON.
+Directory '/src/library-b/node_modules' does not exist, skipping all lookups in it.
+Directory '/src/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+======== Module name 'library-a' was not resolved. ========
diff --git a/testdata/baselines/reference/submodule/compiler/moduleResolution_packageJson_notAtPackageRoot.trace.json b/testdata/baselines/reference/submodule/compiler/moduleResolution_packageJson_notAtPackageRoot.trace.json
new file mode 100644
index 0000000000..17a4409849
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/moduleResolution_packageJson_notAtPackageRoot.trace.json
@@ -0,0 +1,17 @@
+======== Resolving module 'foo/bar' from '/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/package.json' does not exist.
+Loading module 'foo/bar' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Found 'package.json' at '/node_modules/foo/bar/package.json'.
+Found 'package.json' at '/node_modules/foo/package.json'.
+File '/node_modules/foo/bar.ts' does not exist.
+File '/node_modules/foo/bar.tsx' does not exist.
+File '/node_modules/foo/bar.d.ts' does not exist.
+'package.json' does not have a 'typesVersions' field.
+'package.json' does not have a 'typings' field.
+'package.json' has 'types' field 'types.d.ts' that references '/node_modules/foo/bar/types.d.ts'.
+File '/node_modules/foo/bar/types.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/foo/bar/types.d.ts', result '/node_modules/foo/bar/types.d.ts'.
+======== Module name 'foo/bar' was successfully resolved to '/node_modules/foo/bar/types.d.ts'. ========
diff --git a/testdata/baselines/reference/submodule/compiler/moduleResolution_packageJson_notAtPackageRoot_fakeScopedPackage.trace.json b/testdata/baselines/reference/submodule/compiler/moduleResolution_packageJson_notAtPackageRoot_fakeScopedPackage.trace.json
new file mode 100644
index 0000000000..6897fece16
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/moduleResolution_packageJson_notAtPackageRoot_fakeScopedPackage.trace.json
@@ -0,0 +1,17 @@
+======== Resolving module 'foo/@bar' from '/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/package.json' does not exist.
+Loading module 'foo/@bar' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Found 'package.json' at '/node_modules/foo/@bar/package.json'.
+Found 'package.json' at '/node_modules/foo/package.json'.
+File '/node_modules/foo/@bar.ts' does not exist.
+File '/node_modules/foo/@bar.tsx' does not exist.
+File '/node_modules/foo/@bar.d.ts' does not exist.
+'package.json' does not have a 'typesVersions' field.
+'package.json' does not have a 'typings' field.
+'package.json' has 'types' field 'types.d.ts' that references '/node_modules/foo/@bar/types.d.ts'.
+File '/node_modules/foo/@bar/types.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/foo/@bar/types.d.ts', result '/node_modules/foo/@bar/types.d.ts'.
+======== Module name 'foo/@bar' was successfully resolved to '/node_modules/foo/@bar/types.d.ts'. ========
diff --git a/testdata/baselines/reference/submodule/compiler/moduleResolution_packageJson_scopedPackage.trace.json b/testdata/baselines/reference/submodule/compiler/moduleResolution_packageJson_scopedPackage.trace.json
new file mode 100644
index 0000000000..5b793be6a6
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/moduleResolution_packageJson_scopedPackage.trace.json
@@ -0,0 +1,16 @@
+======== Resolving module '@foo/bar' from '/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/package.json' does not exist.
+Loading module '@foo/bar' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Found 'package.json' at '/node_modules/@foo/bar/package.json'.
+File '/node_modules/@foo/bar.ts' does not exist.
+File '/node_modules/@foo/bar.tsx' does not exist.
+File '/node_modules/@foo/bar.d.ts' does not exist.
+'package.json' does not have a 'typesVersions' field.
+'package.json' does not have a 'typings' field.
+'package.json' has 'types' field 'types.d.ts' that references '/node_modules/@foo/bar/types.d.ts'.
+File '/node_modules/@foo/bar/types.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/@foo/bar/types.d.ts', result '/node_modules/@foo/bar/types.d.ts'.
+======== Module name '@foo/bar' was successfully resolved to '/node_modules/@foo/bar/types.d.ts'. ========
diff --git a/testdata/baselines/reference/submodule/compiler/moduleResolution_packageJson_yesAtPackageRoot.trace.json b/testdata/baselines/reference/submodule/compiler/moduleResolution_packageJson_yesAtPackageRoot.trace.json
new file mode 100644
index 0000000000..ce3bed3bad
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/moduleResolution_packageJson_yesAtPackageRoot.trace.json
@@ -0,0 +1,25 @@
+======== Resolving module 'foo/bar' from '/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/package.json' does not exist.
+Loading module 'foo/bar' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/node_modules/foo/bar/package.json' does not exist.
+Found 'package.json' at '/node_modules/foo/package.json'.
+'package.json' does not have a 'typesVersions' field.
+File '/node_modules/foo/bar.ts' does not exist.
+File '/node_modules/foo/bar.tsx' does not exist.
+File '/node_modules/foo/bar.d.ts' does not exist.
+File '/node_modules/foo/bar/index.ts' does not exist.
+File '/node_modules/foo/bar/index.tsx' does not exist.
+File '/node_modules/foo/bar/index.d.ts' does not exist.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript, JSON.
+File '/node_modules/foo/bar/package.json' does not exist according to earlier cached lookups.
+File '/node_modules/foo/package.json' exists according to earlier cached lookups.
+File '/node_modules/foo/bar.js' does not exist.
+File '/node_modules/foo/bar.jsx' does not exist.
+File '/node_modules/foo/bar/index.js' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolving real path for '/node_modules/foo/bar/index.js', result '/node_modules/foo/bar/index.js'.
+======== Module name 'foo/bar' was successfully resolved to '/node_modules/foo/bar/index.js' with Package ID 'foo@1.2.3'. ========
diff --git a/testdata/baselines/reference/submodule/compiler/moduleResolution_packageJson_yesAtPackageRoot_fakeScopedPackage.trace.json b/testdata/baselines/reference/submodule/compiler/moduleResolution_packageJson_yesAtPackageRoot_fakeScopedPackage.trace.json
new file mode 100644
index 0000000000..555d66b09b
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/moduleResolution_packageJson_yesAtPackageRoot_fakeScopedPackage.trace.json
@@ -0,0 +1,25 @@
+======== Resolving module 'foo/@bar' from '/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/package.json' does not exist.
+Loading module 'foo/@bar' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/node_modules/foo/@bar/package.json' does not exist.
+Found 'package.json' at '/node_modules/foo/package.json'.
+'package.json' does not have a 'typesVersions' field.
+File '/node_modules/foo/@bar.ts' does not exist.
+File '/node_modules/foo/@bar.tsx' does not exist.
+File '/node_modules/foo/@bar.d.ts' does not exist.
+File '/node_modules/foo/@bar/index.ts' does not exist.
+File '/node_modules/foo/@bar/index.tsx' does not exist.
+File '/node_modules/foo/@bar/index.d.ts' does not exist.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript, JSON.
+File '/node_modules/foo/@bar/package.json' does not exist according to earlier cached lookups.
+File '/node_modules/foo/package.json' exists according to earlier cached lookups.
+File '/node_modules/foo/@bar.js' does not exist.
+File '/node_modules/foo/@bar.jsx' does not exist.
+File '/node_modules/foo/@bar/index.js' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolving real path for '/node_modules/foo/@bar/index.js', result '/node_modules/foo/@bar/index.js'.
+======== Module name 'foo/@bar' was successfully resolved to '/node_modules/foo/@bar/index.js' with Package ID 'foo@1.2.3'. ========
diff --git a/testdata/baselines/reference/submodule/compiler/moduleResolution_packageJson_yesAtPackageRoot_mainFieldInSubDirectory.trace.json b/testdata/baselines/reference/submodule/compiler/moduleResolution_packageJson_yesAtPackageRoot_mainFieldInSubDirectory.trace.json
new file mode 100644
index 0000000000..eeba5d48f4
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/moduleResolution_packageJson_yesAtPackageRoot_mainFieldInSubDirectory.trace.json
@@ -0,0 +1,21 @@
+======== Resolving module 'foo' from '/index.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/package.json' does not exist.
+Loading module 'foo' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Found 'package.json' at '/node_modules/foo/package.json'.
+File '/node_modules/foo.ts' does not exist.
+File '/node_modules/foo.tsx' does not exist.
+File '/node_modules/foo.d.ts' does not exist.
+'package.json' does not have a 'typesVersions' field.
+'package.json' does not have a 'typings' field.
+'package.json' does not have a 'types' field.
+'package.json' has 'main' field 'src/index.js' that references '/node_modules/foo/src/index.js'.
+File name '/node_modules/foo/src/index.js' has a '.js' extension - stripping it.
+File '/node_modules/foo/src/index.ts' does not exist.
+File '/node_modules/foo/src/index.tsx' does not exist.
+File '/node_modules/foo/src/index.d.ts' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolving real path for '/node_modules/foo/src/index.d.ts', result '/node_modules/foo/src/index.d.ts'.
+======== Module name 'foo' was successfully resolved to '/node_modules/foo/src/index.d.ts' with Package ID 'foo@1.2.3'. ========
diff --git a/testdata/baselines/reference/submodule/compiler/nodeColonModuleResolution.trace.json b/testdata/baselines/reference/submodule/compiler/nodeColonModuleResolution.trace.json
new file mode 100644
index 0000000000..35964aaeba
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/nodeColonModuleResolution.trace.json
@@ -0,0 +1,39 @@
+======== Resolving module 'ph' from '/a/b/node_modules/@types/node/ph.d.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/a/b/node_modules/@types/node/package.json' does not exist according to earlier cached lookups.
+File '/a/b/node_modules/@types/package.json' does not exist according to earlier cached lookups.
+File '/a/b/node_modules/package.json' does not exist according to earlier cached lookups.
+File '/a/b/package.json' does not exist according to earlier cached lookups.
+File '/a/package.json' does not exist according to earlier cached lookups.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'ph' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Directory '/a/b/node_modules/@types/node/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/node_modules/@types/node/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/a/b/node_modules/@types/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/node_modules/@types/node_modules/@types' does not exist, skipping all lookups in it.
+File '/a/b/node_modules/ph.ts' does not exist.
+File '/a/b/node_modules/ph.tsx' does not exist.
+File '/a/b/node_modules/ph.d.ts' does not exist.
+File '/a/b/node_modules/@types/ph.d.ts' does not exist.
+Directory '/a/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript, JSON.
+Directory '/a/b/node_modules/@types/node/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/node_modules/@types/node_modules' does not exist, skipping all lookups in it.
+File '/a/b/node_modules/ph.js' does not exist.
+File '/a/b/node_modules/ph.jsx' does not exist.
+Directory '/a/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+======== Module name 'ph' was not resolved. ========
+======== Resolving module 'node:ph' from '/a/b/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/a/b/package.json' does not exist.
+File '/a/package.json' does not exist.
+File '/package.json' does not exist.
+Skipping module 'node:ph' that looks like an absolute URI, target file types: TypeScript, JavaScript, Declaration, JSON.
+======== Module name 'node:ph' was not resolved. ========
diff --git a/testdata/baselines/reference/submodule/compiler/nodeColonModuleResolution2.trace.json b/testdata/baselines/reference/submodule/compiler/nodeColonModuleResolution2.trace.json
new file mode 100644
index 0000000000..bdd4cc8534
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/nodeColonModuleResolution2.trace.json
@@ -0,0 +1,18 @@
+======== Resolving module 'fake:thing' from '/a/b/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+'paths' option is specified, looking for a pattern to match module name 'fake:thing'.
+Module name 'fake:thing', matched pattern 'fake:thing'.
+Trying substitution './node_modules/fake/thing', candidate module location: './node_modules/fake/thing'.
+Loading module as file / folder, candidate module location '/a/b/node_modules/fake/thing', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/a/b/node_modules/fake/thing.ts' does not exist.
+File '/a/b/node_modules/fake/thing.tsx' does not exist.
+File '/a/b/node_modules/fake/thing.d.ts' does not exist.
+File '/a/b/node_modules/fake/thing.js' does not exist.
+File '/a/b/node_modules/fake/thing.jsx' does not exist.
+File '/a/b/node_modules/fake/thing/package.json' does not exist.
+File '/a/b/node_modules/fake/thing/index.ts' does not exist.
+File '/a/b/node_modules/fake/thing/index.tsx' does not exist.
+File '/a/b/node_modules/fake/thing/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/a/b/node_modules/fake/thing/index.d.ts', result '/a/b/node_modules/fake/thing/index.d.ts'.
+======== Module name 'fake:thing' was successfully resolved to '/a/b/node_modules/fake/thing/index.d.ts'. ========
diff --git a/testdata/baselines/reference/submodule/compiler/nodeNextModuleResolution1.trace.json b/testdata/baselines/reference/submodule/compiler/nodeNextModuleResolution1.trace.json
new file mode 100644
index 0000000000..ce51ceaa4f
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/nodeNextModuleResolution1.trace.json
@@ -0,0 +1,24 @@
+======== Resolving module 'foo' from '/a/b/c/d/e/app.ts'. ========
+Explicitly specified module resolution kind: 'NodeNext'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/a/b/c/d/e/package.json' exists according to earlier cached lookups.
+Loading module 'foo' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Directory '/a/b/c/d/e/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/c/d/e/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/a/b/c/d/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/c/d/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/a/b/c/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/c/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/a/b/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/a/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript.
+Directory '/a/b/c/d/e/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/c/d/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/c/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+======== Module name 'foo' was not resolved. ========
diff --git a/testdata/baselines/reference/submodule/compiler/nodeNextModuleResolution2.trace.json b/testdata/baselines/reference/submodule/compiler/nodeNextModuleResolution2.trace.json
new file mode 100644
index 0000000000..6e2c914491
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/nodeNextModuleResolution2.trace.json
@@ -0,0 +1,24 @@
+======== Resolving module 'foo' from '/a/b/c/d/e/app.mts'. ========
+Explicitly specified module resolution kind: 'NodeNext'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/a/b/c/d/e/package.json' does not exist.
+File '/a/b/c/d/package.json' does not exist.
+File '/a/b/c/package.json' does not exist.
+File '/a/b/package.json' does not exist.
+File '/a/package.json' does not exist.
+File '/package.json' does not exist.
+Loading module 'foo' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Directory '/a/b/c/d/e/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/c/d/e/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/a/b/c/d/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/c/d/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/a/b/c/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/c/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/a/b/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/node_modules/@types' does not exist, skipping all lookups in it.
+Found 'package.json' at '/a/node_modules/foo/package.json'.
+Using 'exports' subpath '.' with target './index.d.ts'.
+File '/a/node_modules/foo/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/a/node_modules/foo/index.d.ts', result '/a/node_modules/foo/index.d.ts'.
+======== Module name 'foo' was successfully resolved to '/a/node_modules/foo/index.d.ts'. ========
diff --git a/testdata/baselines/reference/submodule/compiler/pathMappingBasedModuleResolution3_node.trace.json b/testdata/baselines/reference/submodule/compiler/pathMappingBasedModuleResolution3_node.trace.json
new file mode 100644
index 0000000000..bf3d568b76
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/pathMappingBasedModuleResolution3_node.trace.json
@@ -0,0 +1,44 @@
+======== Resolving module 'folder2/file2' from 'c:/root/folder1/file1.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File 'c:/root/folder1/package.json' does not exist.
+File 'c:/root/package.json' does not exist according to earlier cached lookups.
+File 'c:/package.json' does not exist according to earlier cached lookups.
+Loading module 'folder2/file2' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Directory 'c:/root/folder1/node_modules' does not exist, skipping all lookups in it.
+Directory 'c:/root/folder1/node_modules/@types' does not exist, skipping all lookups in it.
+Directory 'c:/root/node_modules' does not exist, skipping all lookups in it.
+Directory 'c:/root/node_modules/@types' does not exist, skipping all lookups in it.
+Directory 'c:/node_modules/@types' does not exist, skipping all lookups in it.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript, JSON.
+Directory 'c:/root/folder1/node_modules' does not exist, skipping all lookups in it.
+Directory 'c:/root/node_modules' does not exist, skipping all lookups in it.
+======== Module name 'folder2/file2' was not resolved. ========
+======== Resolving module './file3' from 'c:/root/folder2/file2.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+Loading module as file / folder, candidate module location 'c:/root/folder2/file3', target file types: TypeScript, JavaScript, Declaration, JSON.
+File 'c:/root/folder2/file3.ts' exists - use it as a name resolution result.
+======== Module name './file3' was successfully resolved to 'c:/root/folder2/file3.ts'. ========
+======== Resolving module 'file4' from 'c:/root/folder2/file2.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File 'c:/root/folder2/package.json' does not exist.
+File 'c:/root/package.json' does not exist.
+File 'c:/package.json' does not exist according to earlier cached lookups.
+Loading module 'file4' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Directory 'c:/root/folder2/node_modules' does not exist, skipping all lookups in it.
+Directory 'c:/root/folder2/node_modules/@types' does not exist, skipping all lookups in it.
+Directory 'c:/root/node_modules' does not exist, skipping all lookups in it.
+Directory 'c:/root/node_modules/@types' does not exist, skipping all lookups in it.
+File 'c:/node_modules/file4/package.json' does not exist according to earlier cached lookups.
+File 'c:/node_modules/file4.ts' does not exist.
+File 'c:/node_modules/file4.tsx' does not exist.
+File 'c:/node_modules/file4.d.ts' does not exist.
+File 'c:/node_modules/file4/index.ts' does not exist.
+File 'c:/node_modules/file4/index.tsx' does not exist.
+File 'c:/node_modules/file4/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for 'c:/node_modules/file4/index.d.ts', result 'c:/node_modules/file4/index.d.ts'.
+======== Module name 'file4' was successfully resolved to 'c:/node_modules/file4/index.d.ts'. ========
diff --git a/testdata/baselines/reference/submodule/compiler/pathMappingBasedModuleResolution4_node.trace.json b/testdata/baselines/reference/submodule/compiler/pathMappingBasedModuleResolution4_node.trace.json
new file mode 100644
index 0000000000..3be9961801
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/pathMappingBasedModuleResolution4_node.trace.json
@@ -0,0 +1,44 @@
+======== Resolving module 'folder2/file2' from 'c:/root/folder1/file1.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File 'c:/root/folder1/package.json' does not exist.
+File 'c:/root/package.json' does not exist according to earlier cached lookups.
+File 'c:/package.json' does not exist according to earlier cached lookups.
+Loading module 'folder2/file2' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Directory 'c:/root/folder1/node_modules' does not exist, skipping all lookups in it.
+Directory 'c:/root/folder1/node_modules/@types' does not exist, skipping all lookups in it.
+Directory 'c:/root/node_modules' does not exist, skipping all lookups in it.
+Directory 'c:/root/node_modules/@types' does not exist, skipping all lookups in it.
+Directory 'c:/node_modules/@types' does not exist, skipping all lookups in it.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript, JSON.
+Directory 'c:/root/folder1/node_modules' does not exist, skipping all lookups in it.
+Directory 'c:/root/node_modules' does not exist, skipping all lookups in it.
+======== Module name 'folder2/file2' was not resolved. ========
+======== Resolving module './file3' from 'c:/root/folder2/file2.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+Loading module as file / folder, candidate module location 'c:/root/folder2/file3', target file types: TypeScript, JavaScript, Declaration, JSON.
+File 'c:/root/folder2/file3.ts' exists - use it as a name resolution result.
+======== Module name './file3' was successfully resolved to 'c:/root/folder2/file3.ts'. ========
+======== Resolving module 'file4' from 'c:/root/folder2/file2.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File 'c:/root/folder2/package.json' does not exist.
+File 'c:/root/package.json' does not exist.
+File 'c:/package.json' does not exist.
+Loading module 'file4' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Directory 'c:/root/folder2/node_modules' does not exist, skipping all lookups in it.
+Directory 'c:/root/folder2/node_modules/@types' does not exist, skipping all lookups in it.
+Directory 'c:/root/node_modules' does not exist, skipping all lookups in it.
+Directory 'c:/root/node_modules/@types' does not exist, skipping all lookups in it.
+File 'c:/node_modules/file4/package.json' does not exist.
+File 'c:/node_modules/file4.ts' does not exist.
+File 'c:/node_modules/file4.tsx' does not exist.
+File 'c:/node_modules/file4.d.ts' does not exist.
+File 'c:/node_modules/file4/index.ts' does not exist.
+File 'c:/node_modules/file4/index.tsx' does not exist.
+File 'c:/node_modules/file4/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for 'c:/node_modules/file4/index.d.ts', result 'c:/node_modules/file4/index.d.ts'.
+======== Module name 'file4' was successfully resolved to 'c:/node_modules/file4/index.d.ts'. ========
diff --git a/testdata/baselines/reference/submodule/compiler/pathMappingBasedModuleResolution5_node.trace.json b/testdata/baselines/reference/submodule/compiler/pathMappingBasedModuleResolution5_node.trace.json
new file mode 100644
index 0000000000..baa2b61635
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/pathMappingBasedModuleResolution5_node.trace.json
@@ -0,0 +1,70 @@
+======== Resolving module 'folder2/file1' from 'c:/root/folder1/file1.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+'paths' option is specified, looking for a pattern to match module name 'folder2/file1'.
+Module name 'folder2/file1', matched pattern '*'.
+Trying substitution '*', candidate module location: 'folder2/file1'.
+Loading module as file / folder, candidate module location 'c:/root/folder2/file1', target file types: TypeScript, JavaScript, Declaration, JSON.
+File 'c:/root/folder2/file1.ts' exists - use it as a name resolution result.
+======== Module name 'folder2/file1' was successfully resolved to 'c:/root/folder2/file1.ts'. ========
+======== Resolving module 'folder3/file2' from 'c:/root/folder1/file1.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+'paths' option is specified, looking for a pattern to match module name 'folder3/file2'.
+Module name 'folder3/file2', matched pattern '*'.
+Trying substitution '*', candidate module location: 'folder3/file2'.
+Loading module as file / folder, candidate module location 'c:/root/folder3/file2', target file types: TypeScript, JavaScript, Declaration, JSON.
+Trying substitution 'generated/*', candidate module location: 'generated/folder3/file2'.
+Loading module as file / folder, candidate module location 'c:/root/generated/folder3/file2', target file types: TypeScript, JavaScript, Declaration, JSON.
+File 'c:/root/generated/folder3/file2.ts' exists - use it as a name resolution result.
+======== Module name 'folder3/file2' was successfully resolved to 'c:/root/generated/folder3/file2.ts'. ========
+======== Resolving module 'components/file3' from 'c:/root/folder1/file1.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+'paths' option is specified, looking for a pattern to match module name 'components/file3'.
+Module name 'components/file3', matched pattern 'components/*'.
+Trying substitution 'shared/components/*', candidate module location: 'shared/components/file3'.
+Loading module as file / folder, candidate module location 'c:/root/shared/components/file3', target file types: TypeScript, JavaScript, Declaration, JSON.
+File 'c:/root/shared/components/file3.ts' does not exist.
+File 'c:/root/shared/components/file3.tsx' does not exist.
+File 'c:/root/shared/components/file3.d.ts' does not exist.
+File 'c:/root/shared/components/file3.js' does not exist.
+File 'c:/root/shared/components/file3.jsx' does not exist.
+File 'c:/root/shared/components/file3/package.json' does not exist.
+File 'c:/root/shared/components/file3/index.ts' does not exist.
+File 'c:/root/shared/components/file3/index.tsx' does not exist.
+File 'c:/root/shared/components/file3/index.d.ts' exists - use it as a name resolution result.
+======== Module name 'components/file3' was successfully resolved to 'c:/root/shared/components/file3/index.d.ts'. ========
+======== Resolving module 'file4' from 'c:/root/folder1/file1.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+'paths' option is specified, looking for a pattern to match module name 'file4'.
+Module name 'file4', matched pattern '*'.
+Trying substitution '*', candidate module location: 'file4'.
+Loading module as file / folder, candidate module location 'c:/root/file4', target file types: TypeScript, JavaScript, Declaration, JSON.
+File 'c:/root/file4.ts' does not exist.
+File 'c:/root/file4.tsx' does not exist.
+File 'c:/root/file4.d.ts' does not exist.
+File 'c:/root/file4.js' does not exist.
+File 'c:/root/file4.jsx' does not exist.
+Directory 'c:/root/file4' does not exist, skipping all lookups in it.
+Trying substitution 'generated/*', candidate module location: 'generated/file4'.
+Loading module as file / folder, candidate module location 'c:/root/generated/file4', target file types: TypeScript, JavaScript, Declaration, JSON.
+File 'c:/root/generated/file4.ts' does not exist.
+File 'c:/root/generated/file4.tsx' does not exist.
+File 'c:/root/generated/file4.d.ts' does not exist.
+File 'c:/root/generated/file4.js' does not exist.
+File 'c:/root/generated/file4.jsx' does not exist.
+Directory 'c:/root/generated/file4' does not exist, skipping all lookups in it.
+File 'c:/root/folder1/package.json' does not exist.
+File 'c:/root/package.json' does not exist.
+File 'c:/package.json' does not exist.
+Loading module 'file4' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Directory 'c:/root/folder1/node_modules' does not exist, skipping all lookups in it.
+Directory 'c:/root/folder1/node_modules/@types' does not exist, skipping all lookups in it.
+Directory 'c:/root/node_modules' does not exist, skipping all lookups in it.
+Directory 'c:/root/node_modules/@types' does not exist, skipping all lookups in it.
+File 'c:/node_modules/file4.ts' exists - use it as a name resolution result.
+Resolving real path for 'c:/node_modules/file4.ts', result 'c:/node_modules/file4.ts'.
+======== Module name 'file4' was successfully resolved to 'c:/node_modules/file4.ts'. ========
diff --git a/testdata/baselines/reference/submodule/compiler/pathMappingBasedModuleResolution6_node.trace.json b/testdata/baselines/reference/submodule/compiler/pathMappingBasedModuleResolution6_node.trace.json
new file mode 100644
index 0000000000..a6b771ebbf
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/pathMappingBasedModuleResolution6_node.trace.json
@@ -0,0 +1,6 @@
+======== Resolving module './project/file3' from 'c:/root/src/file1.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+Loading module as file / folder, candidate module location 'c:/root/src/project/file3', target file types: TypeScript, JavaScript, Declaration, JSON.
+Directory 'c:/root/src/project' does not exist, skipping all lookups in it.
+======== Module name './project/file3' was not resolved. ========
diff --git a/testdata/baselines/reference/submodule/compiler/pathMappingBasedModuleResolution7_node.trace.json b/testdata/baselines/reference/submodule/compiler/pathMappingBasedModuleResolution7_node.trace.json
new file mode 100644
index 0000000000..d337abb7ff
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/pathMappingBasedModuleResolution7_node.trace.json
@@ -0,0 +1,41 @@
+======== Resolving module './project/file2' from 'c:/root/src/file1.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+Loading module as file / folder, candidate module location 'c:/root/src/project/file2', target file types: TypeScript, JavaScript, Declaration, JSON.
+Directory 'c:/root/src/project' does not exist, skipping all lookups in it.
+======== Module name './project/file2' was not resolved. ========
+======== Resolving module 'module3' from 'c:/root/src/file1.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+'paths' option is specified, looking for a pattern to match module name 'module3'.
+Module name 'module3', matched pattern '*'.
+Trying substitution '*', candidate module location: 'module3'.
+Loading module as file / folder, candidate module location 'c:/root/src/module3', target file types: TypeScript, JavaScript, Declaration, JSON.
+File 'c:/root/src/module3.ts' does not exist.
+File 'c:/root/src/module3.tsx' does not exist.
+File 'c:/root/src/module3.d.ts' does not exist.
+File 'c:/root/src/module3.js' does not exist.
+File 'c:/root/src/module3.jsx' does not exist.
+Directory 'c:/root/src/module3' does not exist, skipping all lookups in it.
+Trying substitution 'c:/shared/*', candidate module location: 'c:/shared/module3'.
+Loading module as file / folder, candidate module location 'c:/shared/module3', target file types: TypeScript, JavaScript, Declaration, JSON.
+File 'c:/shared/module3.ts' does not exist.
+File 'c:/shared/module3.tsx' does not exist.
+File 'c:/shared/module3.d.ts' does not exist.
+File 'c:/shared/module3.js' does not exist.
+File 'c:/shared/module3.jsx' does not exist.
+Directory 'c:/shared/module3' does not exist, skipping all lookups in it.
+File 'c:/root/src/package.json' does not exist.
+File 'c:/root/package.json' does not exist.
+File 'c:/package.json' does not exist.
+Loading module 'module3' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Directory 'c:/root/src/node_modules' does not exist, skipping all lookups in it.
+Directory 'c:/root/src/node_modules/@types' does not exist, skipping all lookups in it.
+Directory 'c:/root/node_modules' does not exist, skipping all lookups in it.
+Directory 'c:/root/node_modules/@types' does not exist, skipping all lookups in it.
+File 'c:/node_modules/module3.ts' does not exist.
+File 'c:/node_modules/module3.tsx' does not exist.
+File 'c:/node_modules/module3.d.ts' exists - use it as a name resolution result.
+Resolving real path for 'c:/node_modules/module3.d.ts', result 'c:/node_modules/module3.d.ts'.
+======== Module name 'module3' was successfully resolved to 'c:/node_modules/module3.d.ts'. ========
diff --git a/testdata/baselines/reference/submodule/compiler/pathMappingBasedModuleResolution8_node.trace.json b/testdata/baselines/reference/submodule/compiler/pathMappingBasedModuleResolution8_node.trace.json
new file mode 100644
index 0000000000..db03ff8304
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/pathMappingBasedModuleResolution8_node.trace.json
@@ -0,0 +1,8 @@
+======== Resolving module '@speedy/folder1/testing' from 'c:/root/index.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+'paths' option is specified, looking for a pattern to match module name '@speedy/folder1/testing'.
+Module name '@speedy/folder1/testing', matched pattern '@speedy/*/testing'.
+Trying substitution '*/dist/index.ts', candidate module location: 'folder1/dist/index.ts'.
+File 'c:/root/folder1/dist/index.ts' exists - use it as a name resolution result.
+======== Module name '@speedy/folder1/testing' was successfully resolved to 'c:/root/folder1/dist/index.ts'. ========
diff --git a/testdata/baselines/reference/submodule/compiler/pathMappingBasedModuleResolution_rootImport_aliasWithRoot.trace.json b/testdata/baselines/reference/submodule/compiler/pathMappingBasedModuleResolution_rootImport_aliasWithRoot.trace.json
new file mode 100644
index 0000000000..9bd8d21bcc
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/pathMappingBasedModuleResolution_rootImport_aliasWithRoot.trace.json
@@ -0,0 +1,21 @@
+======== Resolving module '/foo' from '/root/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+'paths' option is specified, looking for a pattern to match module name '/foo'.
+Module name '/foo', matched pattern '/*'.
+Trying substitution './src/*', candidate module location: './src/foo'.
+Loading module as file / folder, candidate module location '/root/src/foo', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/root/src/foo.ts' exists - use it as a name resolution result.
+======== Module name '/foo' was successfully resolved to '/root/src/foo.ts'. ========
+======== Resolving module '/bar' from '/root/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+'paths' option is specified, looking for a pattern to match module name '/bar'.
+Module name '/bar', matched pattern '/*'.
+Trying substitution './src/*', candidate module location: './src/bar'.
+Loading module as file / folder, candidate module location '/root/src/bar', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/root/src/bar.ts' does not exist.
+File '/root/src/bar.tsx' does not exist.
+File '/root/src/bar.d.ts' does not exist.
+File '/root/src/bar.js' exists - use it as a name resolution result.
+======== Module name '/bar' was successfully resolved to '/root/src/bar.js'. ========
diff --git a/testdata/baselines/reference/submodule/compiler/pathMappingBasedModuleResolution_rootImport_aliasWithRoot_differentRootTypes.trace.json b/testdata/baselines/reference/submodule/compiler/pathMappingBasedModuleResolution_rootImport_aliasWithRoot_differentRootTypes.trace.json
new file mode 100644
index 0000000000..c38dde916c
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/pathMappingBasedModuleResolution_rootImport_aliasWithRoot_differentRootTypes.trace.json
@@ -0,0 +1,189 @@
+======== Resolving module '/foo' from '/root/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+'paths' option is specified, looking for a pattern to match module name '/foo'.
+Module name '/foo', matched pattern '/*'.
+Trying substitution './src/*', candidate module location: './src/foo'.
+Loading module as file / folder, candidate module location '/root/src/foo', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/root/src/foo.ts' exists - use it as a name resolution result.
+======== Module name '/foo' was successfully resolved to '/root/src/foo.ts'. ========
+======== Resolving module '/bar' from '/root/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+'paths' option is specified, looking for a pattern to match module name '/bar'.
+Module name '/bar', matched pattern '/*'.
+Trying substitution './src/*', candidate module location: './src/bar'.
+Loading module as file / folder, candidate module location '/root/src/bar', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/root/src/bar.ts' does not exist.
+File '/root/src/bar.tsx' does not exist.
+File '/root/src/bar.d.ts' does not exist.
+File '/root/src/bar.js' exists - use it as a name resolution result.
+======== Module name '/bar' was successfully resolved to '/root/src/bar.js'. ========
+======== Resolving module 'c:/foo' from '/root/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+'paths' option is specified, looking for a pattern to match module name 'c:/foo'.
+Module name 'c:/foo', matched pattern 'c:/*'.
+Trying substitution './src/*', candidate module location: './src/foo'.
+Loading module as file / folder, candidate module location '/root/src/foo', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/root/src/foo.ts' exists - use it as a name resolution result.
+======== Module name 'c:/foo' was successfully resolved to '/root/src/foo.ts'. ========
+======== Resolving module 'c:/bar' from '/root/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+'paths' option is specified, looking for a pattern to match module name 'c:/bar'.
+Module name 'c:/bar', matched pattern 'c:/*'.
+Trying substitution './src/*', candidate module location: './src/bar'.
+Loading module as file / folder, candidate module location '/root/src/bar', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/root/src/bar.ts' does not exist.
+File '/root/src/bar.tsx' does not exist.
+File '/root/src/bar.d.ts' does not exist.
+File '/root/src/bar.js' exists - use it as a name resolution result.
+======== Module name 'c:/bar' was successfully resolved to '/root/src/bar.js'. ========
+======== Resolving module 'c:\foo' from '/root/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+'paths' option is specified, looking for a pattern to match module name 'c:\foo'.
+Module name 'c:\foo', matched pattern 'c:\*'.
+Trying substitution './src/*', candidate module location: './src/foo'.
+Loading module as file / folder, candidate module location '/root/src/foo', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/root/src/foo.ts' exists - use it as a name resolution result.
+======== Module name 'c:\foo' was successfully resolved to '/root/src/foo.ts'. ========
+======== Resolving module 'c:\bar' from '/root/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+'paths' option is specified, looking for a pattern to match module name 'c:\bar'.
+Module name 'c:\bar', matched pattern 'c:\*'.
+Trying substitution './src/*', candidate module location: './src/bar'.
+Loading module as file / folder, candidate module location '/root/src/bar', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/root/src/bar.ts' does not exist.
+File '/root/src/bar.tsx' does not exist.
+File '/root/src/bar.d.ts' does not exist.
+File '/root/src/bar.js' exists - use it as a name resolution result.
+======== Module name 'c:\bar' was successfully resolved to '/root/src/bar.js'. ========
+======== Resolving module '//server/foo' from '/root/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+'paths' option is specified, looking for a pattern to match module name '//server/foo'.
+Module name '//server/foo', matched pattern '//server/*'.
+Trying substitution './src/*', candidate module location: './src/foo'.
+Loading module as file / folder, candidate module location '/root/src/foo', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/root/src/foo.ts' exists - use it as a name resolution result.
+======== Module name '//server/foo' was successfully resolved to '/root/src/foo.ts'. ========
+======== Resolving module '//server/bar' from '/root/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+'paths' option is specified, looking for a pattern to match module name '//server/bar'.
+Module name '//server/bar', matched pattern '//server/*'.
+Trying substitution './src/*', candidate module location: './src/bar'.
+Loading module as file / folder, candidate module location '/root/src/bar', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/root/src/bar.ts' does not exist.
+File '/root/src/bar.tsx' does not exist.
+File '/root/src/bar.d.ts' does not exist.
+File '/root/src/bar.js' exists - use it as a name resolution result.
+======== Module name '//server/bar' was successfully resolved to '/root/src/bar.js'. ========
+======== Resolving module '\\server\foo' from '/root/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+'paths' option is specified, looking for a pattern to match module name '\\server\foo'.
+Module name '\\server\foo', matched pattern '\\server\*'.
+Trying substitution './src/*', candidate module location: './src/foo'.
+Loading module as file / folder, candidate module location '/root/src/foo', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/root/src/foo.ts' exists - use it as a name resolution result.
+======== Module name '\\server\foo' was successfully resolved to '/root/src/foo.ts'. ========
+======== Resolving module '\\server\bar' from '/root/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+'paths' option is specified, looking for a pattern to match module name '\\server\bar'.
+Module name '\\server\bar', matched pattern '\\server\*'.
+Trying substitution './src/*', candidate module location: './src/bar'.
+Loading module as file / folder, candidate module location '/root/src/bar', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/root/src/bar.ts' does not exist.
+File '/root/src/bar.tsx' does not exist.
+File '/root/src/bar.d.ts' does not exist.
+File '/root/src/bar.js' exists - use it as a name resolution result.
+======== Module name '\\server\bar' was successfully resolved to '/root/src/bar.js'. ========
+======== Resolving module 'file:///foo' from '/root/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+'paths' option is specified, looking for a pattern to match module name 'file:///foo'.
+Module name 'file:///foo', matched pattern 'file:///*'.
+Trying substitution './src/*', candidate module location: './src/foo'.
+Loading module as file / folder, candidate module location '/root/src/foo', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/root/src/foo.ts' exists - use it as a name resolution result.
+======== Module name 'file:///foo' was successfully resolved to '/root/src/foo.ts'. ========
+======== Resolving module 'file:///bar' from '/root/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+'paths' option is specified, looking for a pattern to match module name 'file:///bar'.
+Module name 'file:///bar', matched pattern 'file:///*'.
+Trying substitution './src/*', candidate module location: './src/bar'.
+Loading module as file / folder, candidate module location '/root/src/bar', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/root/src/bar.ts' does not exist.
+File '/root/src/bar.tsx' does not exist.
+File '/root/src/bar.d.ts' does not exist.
+File '/root/src/bar.js' exists - use it as a name resolution result.
+======== Module name 'file:///bar' was successfully resolved to '/root/src/bar.js'. ========
+======== Resolving module 'file://c:/foo' from '/root/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+'paths' option is specified, looking for a pattern to match module name 'file://c:/foo'.
+Module name 'file://c:/foo', matched pattern 'file://c:/*'.
+Trying substitution './src/*', candidate module location: './src/foo'.
+Loading module as file / folder, candidate module location '/root/src/foo', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/root/src/foo.ts' exists - use it as a name resolution result.
+======== Module name 'file://c:/foo' was successfully resolved to '/root/src/foo.ts'. ========
+======== Resolving module 'file://c:/bar' from '/root/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+'paths' option is specified, looking for a pattern to match module name 'file://c:/bar'.
+Module name 'file://c:/bar', matched pattern 'file://c:/*'.
+Trying substitution './src/*', candidate module location: './src/bar'.
+Loading module as file / folder, candidate module location '/root/src/bar', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/root/src/bar.ts' does not exist.
+File '/root/src/bar.tsx' does not exist.
+File '/root/src/bar.d.ts' does not exist.
+File '/root/src/bar.js' exists - use it as a name resolution result.
+======== Module name 'file://c:/bar' was successfully resolved to '/root/src/bar.js'. ========
+======== Resolving module 'file://server/foo' from '/root/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+'paths' option is specified, looking for a pattern to match module name 'file://server/foo'.
+Module name 'file://server/foo', matched pattern 'file://server/*'.
+Trying substitution './src/*', candidate module location: './src/foo'.
+Loading module as file / folder, candidate module location '/root/src/foo', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/root/src/foo.ts' exists - use it as a name resolution result.
+======== Module name 'file://server/foo' was successfully resolved to '/root/src/foo.ts'. ========
+======== Resolving module 'file://server/bar' from '/root/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+'paths' option is specified, looking for a pattern to match module name 'file://server/bar'.
+Module name 'file://server/bar', matched pattern 'file://server/*'.
+Trying substitution './src/*', candidate module location: './src/bar'.
+Loading module as file / folder, candidate module location '/root/src/bar', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/root/src/bar.ts' does not exist.
+File '/root/src/bar.tsx' does not exist.
+File '/root/src/bar.d.ts' does not exist.
+File '/root/src/bar.js' exists - use it as a name resolution result.
+======== Module name 'file://server/bar' was successfully resolved to '/root/src/bar.js'. ========
+======== Resolving module 'http://server/foo' from '/root/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+'paths' option is specified, looking for a pattern to match module name 'http://server/foo'.
+Module name 'http://server/foo', matched pattern 'http://server/*'.
+Trying substitution './src/*', candidate module location: './src/foo'.
+Loading module as file / folder, candidate module location '/root/src/foo', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/root/src/foo.ts' exists - use it as a name resolution result.
+======== Module name 'http://server/foo' was successfully resolved to '/root/src/foo.ts'. ========
+======== Resolving module 'http://server/bar' from '/root/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+'paths' option is specified, looking for a pattern to match module name 'http://server/bar'.
+Module name 'http://server/bar', matched pattern 'http://server/*'.
+Trying substitution './src/*', candidate module location: './src/bar'.
+Loading module as file / folder, candidate module location '/root/src/bar', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/root/src/bar.ts' does not exist.
+File '/root/src/bar.tsx' does not exist.
+File '/root/src/bar.d.ts' does not exist.
+File '/root/src/bar.js' exists - use it as a name resolution result.
+======== Module name 'http://server/bar' was successfully resolved to '/root/src/bar.js'. ========
diff --git a/testdata/baselines/reference/submodule/compiler/pathMappingBasedModuleResolution_rootImport_aliasWithRoot_multipleAliases.trace.json b/testdata/baselines/reference/submodule/compiler/pathMappingBasedModuleResolution_rootImport_aliasWithRoot_multipleAliases.trace.json
new file mode 100644
index 0000000000..04ef899b76
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/pathMappingBasedModuleResolution_rootImport_aliasWithRoot_multipleAliases.trace.json
@@ -0,0 +1,21 @@
+======== Resolving module '/import/foo' from '/root/src/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+'paths' option is specified, looking for a pattern to match module name '/import/foo'.
+Module name '/import/foo', matched pattern '/import/*'.
+Trying substitution './import/*', candidate module location: './import/foo'.
+Loading module as file / folder, candidate module location '/root/import/foo', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/root/import/foo.ts' exists - use it as a name resolution result.
+======== Module name '/import/foo' was successfully resolved to '/root/import/foo.ts'. ========
+======== Resolving module '/client/bar' from '/root/src/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+'paths' option is specified, looking for a pattern to match module name '/client/bar'.
+Module name '/client/bar', matched pattern '/client/*'.
+Trying substitution './client/*', candidate module location: './client/bar'.
+Loading module as file / folder, candidate module location '/root/client/bar', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/root/client/bar.ts' does not exist.
+File '/root/client/bar.tsx' does not exist.
+File '/root/client/bar.d.ts' does not exist.
+File '/root/client/bar.js' exists - use it as a name resolution result.
+======== Module name '/client/bar' was successfully resolved to '/root/client/bar.js'. ========
diff --git a/testdata/baselines/reference/submodule/compiler/pathMappingBasedModuleResolution_rootImport_aliasWithRoot_realRootFile.trace.json b/testdata/baselines/reference/submodule/compiler/pathMappingBasedModuleResolution_rootImport_aliasWithRoot_realRootFile.trace.json
new file mode 100644
index 0000000000..4f68837ad7
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/pathMappingBasedModuleResolution_rootImport_aliasWithRoot_realRootFile.trace.json
@@ -0,0 +1,23 @@
+======== Resolving module '/foo' from '/root/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+'paths' option is specified, looking for a pattern to match module name '/foo'.
+Module name '/foo', matched pattern '/*'.
+Trying substitution './src/*', candidate module location: './src/foo'.
+Loading module as file / folder, candidate module location '/root/src/foo', target file types: TypeScript, JavaScript, Declaration, JSON.
+Loading module as file / folder, candidate module location '/foo', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/foo.ts' exists - use it as a name resolution result.
+======== Module name '/foo' was successfully resolved to '/foo.ts'. ========
+======== Resolving module '/bar' from '/root/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+'paths' option is specified, looking for a pattern to match module name '/bar'.
+Module name '/bar', matched pattern '/*'.
+Trying substitution './src/*', candidate module location: './src/bar'.
+Loading module as file / folder, candidate module location '/root/src/bar', target file types: TypeScript, JavaScript, Declaration, JSON.
+Loading module as file / folder, candidate module location '/bar', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/bar.ts' does not exist.
+File '/bar.tsx' does not exist.
+File '/bar.d.ts' does not exist.
+File '/bar.js' exists - use it as a name resolution result.
+======== Module name '/bar' was successfully resolved to '/bar.js'. ========
diff --git a/testdata/baselines/reference/submodule/compiler/pathMappingBasedModuleResolution_rootImport_noAliasWithRoot.trace.json b/testdata/baselines/reference/submodule/compiler/pathMappingBasedModuleResolution_rootImport_noAliasWithRoot.trace.json
new file mode 100644
index 0000000000..950910be01
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/pathMappingBasedModuleResolution_rootImport_noAliasWithRoot.trace.json
@@ -0,0 +1,21 @@
+======== Resolving module '/foo' from '/root/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+'paths' option is specified, looking for a pattern to match module name '/foo'.
+Module name '/foo', matched pattern '*'.
+Trying substitution './src/*', candidate module location: './src//foo'.
+Loading module as file / folder, candidate module location '/root/src/foo', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/root/src/foo.ts' exists - use it as a name resolution result.
+======== Module name '/foo' was successfully resolved to '/root/src/foo.ts'. ========
+======== Resolving module '/bar' from '/root/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+'paths' option is specified, looking for a pattern to match module name '/bar'.
+Module name '/bar', matched pattern '*'.
+Trying substitution './src/*', candidate module location: './src//bar'.
+Loading module as file / folder, candidate module location '/root/src/bar', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/root/src/bar.ts' does not exist.
+File '/root/src/bar.tsx' does not exist.
+File '/root/src/bar.d.ts' does not exist.
+File '/root/src/bar.js' exists - use it as a name resolution result.
+======== Module name '/bar' was successfully resolved to '/root/src/bar.js'. ========
diff --git a/testdata/baselines/reference/submodule/compiler/pathMappingBasedModuleResolution_rootImport_noAliasWithRoot_realRootFile.trace.json b/testdata/baselines/reference/submodule/compiler/pathMappingBasedModuleResolution_rootImport_noAliasWithRoot_realRootFile.trace.json
new file mode 100644
index 0000000000..610a3b617f
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/pathMappingBasedModuleResolution_rootImport_noAliasWithRoot_realRootFile.trace.json
@@ -0,0 +1,23 @@
+======== Resolving module '/foo' from '/root/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+'paths' option is specified, looking for a pattern to match module name '/foo'.
+Module name '/foo', matched pattern '*'.
+Trying substitution './src/*', candidate module location: './src//foo'.
+Loading module as file / folder, candidate module location '/root/src/foo', target file types: TypeScript, JavaScript, Declaration, JSON.
+Loading module as file / folder, candidate module location '/foo', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/foo.ts' exists - use it as a name resolution result.
+======== Module name '/foo' was successfully resolved to '/foo.ts'. ========
+======== Resolving module '/bar' from '/root/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+'paths' option is specified, looking for a pattern to match module name '/bar'.
+Module name '/bar', matched pattern '*'.
+Trying substitution './src/*', candidate module location: './src//bar'.
+Loading module as file / folder, candidate module location '/root/src/bar', target file types: TypeScript, JavaScript, Declaration, JSON.
+Loading module as file / folder, candidate module location '/bar', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/bar.ts' does not exist.
+File '/bar.tsx' does not exist.
+File '/bar.d.ts' does not exist.
+File '/bar.js' exists - use it as a name resolution result.
+======== Module name '/bar' was successfully resolved to '/bar.js'. ========
diff --git a/testdata/baselines/reference/submodule/compiler/pathMappingBasedModuleResolution_withExtension.trace.json b/testdata/baselines/reference/submodule/compiler/pathMappingBasedModuleResolution_withExtension.trace.json
new file mode 100644
index 0000000000..e06bc1c1c9
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/pathMappingBasedModuleResolution_withExtension.trace.json
@@ -0,0 +1,16 @@
+======== Resolving module 'foo' from '/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+'paths' option is specified, looking for a pattern to match module name 'foo'.
+Module name 'foo', matched pattern 'foo'.
+Trying substitution 'foo/foo.ts', candidate module location: 'foo/foo.ts'.
+File '/foo/foo.ts' exists - use it as a name resolution result.
+======== Module name 'foo' was successfully resolved to '/foo/foo.ts'. ========
+======== Resolving module 'bar' from '/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+'paths' option is specified, looking for a pattern to match module name 'bar'.
+Module name 'bar', matched pattern 'bar'.
+Trying substitution 'bar/bar.js', candidate module location: 'bar/bar.js'.
+File '/bar/bar.js' exists - use it as a name resolution result.
+======== Module name 'bar' was successfully resolved to '/bar/bar.js'. ========
diff --git a/testdata/baselines/reference/submodule/compiler/pathMappingBasedModuleResolution_withExtensionInName.trace.json b/testdata/baselines/reference/submodule/compiler/pathMappingBasedModuleResolution_withExtensionInName.trace.json
new file mode 100644
index 0000000000..72b6bea942
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/pathMappingBasedModuleResolution_withExtensionInName.trace.json
@@ -0,0 +1,46 @@
+======== Resolving module 'zone.js' from '/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+'paths' option is specified, looking for a pattern to match module name 'zone.js'.
+Module name 'zone.js', matched pattern '*'.
+Trying substitution 'foo/*', candidate module location: 'foo/zone.js'.
+Loading module as file / folder, candidate module location '/foo/zone.js', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/foo/zone.js' has a '.js' extension - stripping it.
+File '/foo/zone.ts' does not exist.
+File '/foo/zone.tsx' does not exist.
+File '/foo/zone.d.ts' does not exist.
+File '/foo/zone.js' does not exist.
+File '/foo/zone.jsx' does not exist.
+File '/foo/zone.js.ts' does not exist.
+File '/foo/zone.js.tsx' does not exist.
+File '/foo/zone.js.d.ts' does not exist.
+File '/foo/zone.js.js' does not exist.
+File '/foo/zone.js.jsx' does not exist.
+File '/foo/zone.js/package.json' does not exist.
+File '/foo/zone.js/index.ts' does not exist.
+File '/foo/zone.js/index.tsx' does not exist.
+File '/foo/zone.js/index.d.ts' exists - use it as a name resolution result.
+======== Module name 'zone.js' was successfully resolved to '/foo/zone.js/index.d.ts'. ========
+======== Resolving module 'zone.tsx' from '/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+'paths' option is specified, looking for a pattern to match module name 'zone.tsx'.
+Module name 'zone.tsx', matched pattern '*'.
+Trying substitution 'foo/*', candidate module location: 'foo/zone.tsx'.
+Loading module as file / folder, candidate module location '/foo/zone.tsx', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/foo/zone.tsx' has a '.tsx' extension - stripping it.
+File '/foo/zone.tsx' does not exist.
+File '/foo/zone.ts' does not exist.
+File '/foo/zone.d.ts' does not exist.
+File '/foo/zone.jsx' does not exist.
+File '/foo/zone.js' does not exist.
+File '/foo/zone.tsx.ts' does not exist.
+File '/foo/zone.tsx.tsx' does not exist.
+File '/foo/zone.tsx.d.ts' does not exist.
+File '/foo/zone.tsx.js' does not exist.
+File '/foo/zone.tsx.jsx' does not exist.
+File '/foo/zone.tsx/package.json' does not exist.
+File '/foo/zone.tsx/index.ts' does not exist.
+File '/foo/zone.tsx/index.tsx' does not exist.
+File '/foo/zone.tsx/index.d.ts' exists - use it as a name resolution result.
+======== Module name 'zone.tsx' was successfully resolved to '/foo/zone.tsx/index.d.ts'. ========
diff --git a/testdata/baselines/reference/submodule/compiler/pathMappingBasedModuleResolution_withExtension_MapedToNodeModules.trace.json b/testdata/baselines/reference/submodule/compiler/pathMappingBasedModuleResolution_withExtension_MapedToNodeModules.trace.json
new file mode 100644
index 0000000000..1eeb6b8fee
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/pathMappingBasedModuleResolution_withExtension_MapedToNodeModules.trace.json
@@ -0,0 +1,15 @@
+======== Resolving module 'foo/bar/foobar.js' from '/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+'paths' option is specified, looking for a pattern to match module name 'foo/bar/foobar.js'.
+Module name 'foo/bar/foobar.js', matched pattern '*'.
+Trying substitution 'node_modules/*', candidate module location: 'node_modules/foo/bar/foobar.js'.
+Loading module as file / folder, candidate module location '/node_modules/foo/bar/foobar.js', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/node_modules/foo/bar/foobar.js' has a '.js' extension - stripping it.
+File '/node_modules/foo/bar/foobar.ts' does not exist.
+File '/node_modules/foo/bar/foobar.tsx' does not exist.
+File '/node_modules/foo/bar/foobar.d.ts' does not exist.
+File '/node_modules/foo/bar/foobar.js' exists - use it as a name resolution result.
+File '/node_modules/foo/package.json' does not exist.
+Resolving real path for '/node_modules/foo/bar/foobar.js', result '/node_modules/foo/bar/foobar.js'.
+======== Module name 'foo/bar/foobar.js' was successfully resolved to '/node_modules/foo/bar/foobar.js'. ========
diff --git a/testdata/baselines/reference/submodule/compiler/pathMappingBasedModuleResolution_withExtension_failedLookup.trace.json b/testdata/baselines/reference/submodule/compiler/pathMappingBasedModuleResolution_withExtension_failedLookup.trace.json
new file mode 100644
index 0000000000..7be5ad8451
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/pathMappingBasedModuleResolution_withExtension_failedLookup.trace.json
@@ -0,0 +1,17 @@
+======== Resolving module 'foo' from '/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+'paths' option is specified, looking for a pattern to match module name 'foo'.
+Module name 'foo', matched pattern 'foo'.
+Trying substitution 'foo/foo.ts', candidate module location: 'foo/foo.ts'.
+File '/foo/foo.ts' does not exist.
+Loading module as file / folder, candidate module location '/foo/foo.ts', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/foo/foo.ts' has a '.ts' extension - stripping it.
+File '/package.json' does not exist.
+Loading module 'foo' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript, JSON.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+======== Module name 'foo' was not resolved. ========
diff --git a/testdata/baselines/reference/submodule/compiler/pathsValidation4.trace.json b/testdata/baselines/reference/submodule/compiler/pathsValidation4.trace.json
new file mode 100644
index 0000000000..3e08aef365
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/pathsValidation4.trace.json
@@ -0,0 +1,20 @@
+======== Resolving module 'someModule' from '/.src/src/main.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+'paths' option is specified, looking for a pattern to match module name 'someModule'.
+File '/.src/src/package.json' does not exist.
+File '/.src/package.json' does not exist.
+File '/package.json' does not exist.
+Loading module 'someModule' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Directory '/.src/src/node_modules' does not exist, skipping all lookups in it.
+Directory '/.src/src/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/.src/node_modules' does not exist, skipping all lookups in it.
+Directory '/.src/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript, JSON.
+Directory '/.src/src/node_modules' does not exist, skipping all lookups in it.
+Directory '/.src/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+======== Module name 'someModule' was not resolved. ========
diff --git a/testdata/baselines/reference/submodule/compiler/pathsValidation5.trace.json b/testdata/baselines/reference/submodule/compiler/pathsValidation5.trace.json
new file mode 100644
index 0000000000..3e08aef365
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/pathsValidation5.trace.json
@@ -0,0 +1,20 @@
+======== Resolving module 'someModule' from '/.src/src/main.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+'paths' option is specified, looking for a pattern to match module name 'someModule'.
+File '/.src/src/package.json' does not exist.
+File '/.src/package.json' does not exist.
+File '/package.json' does not exist.
+Loading module 'someModule' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Directory '/.src/src/node_modules' does not exist, skipping all lookups in it.
+Directory '/.src/src/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/.src/node_modules' does not exist, skipping all lookups in it.
+Directory '/.src/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript, JSON.
+Directory '/.src/src/node_modules' does not exist, skipping all lookups in it.
+Directory '/.src/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+======== Module name 'someModule' was not resolved. ========
diff --git a/testdata/baselines/reference/submodule/compiler/reactJsxReactResolvedNodeNext.trace.json b/testdata/baselines/reference/submodule/compiler/reactJsxReactResolvedNodeNext.trace.json
new file mode 100644
index 0000000000..e5848389ef
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/reactJsxReactResolvedNodeNext.trace.json
@@ -0,0 +1,39 @@
+======== Resolving module 'react/jsx-runtime' from '/.src/file.tsx'. ========
+Module resolution kind is not specified, using 'NodeNext'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+File '/.src/package.json' does not exist according to earlier cached lookups.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'react/jsx-runtime' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/.src/node_modules/@types/react/package.json' exists according to earlier cached lookups.
+File '/.src/node_modules/@types/react/jsx-runtime.d.ts' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolving real path for '/.src/node_modules/@types/react/jsx-runtime.d.ts', result '/.src/node_modules/@types/react/jsx-runtime.d.ts'.
+======== Module name 'react/jsx-runtime' was successfully resolved to '/.src/node_modules/@types/react/jsx-runtime.d.ts' with Package ID '@types/react@0.0.1'. ========
+======== Resolving module './' from '/.src/node_modules/@types/react/jsx-runtime.d.ts'. ========
+Module resolution kind is not specified, using 'NodeNext'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+Loading module as file / folder, candidate module location '/.src/node_modules/@types/react/', target file types: TypeScript, JavaScript, Declaration.
+File '/.src/node_modules/@types/react/package.json' exists according to earlier cached lookups.
+'package.json' does not have a 'typings' field.
+'package.json' has 'types' field 'index.d.ts' that references '/.src/node_modules/@types/react/index.d.ts'.
+File '/.src/node_modules/@types/react/index.d.ts' exists - use it as a name resolution result.
+======== Module name './' was successfully resolved to '/.src/node_modules/@types/react/index.d.ts'. ========
+======== Resolving module './' from '/.src/node_modules/@types/react/jsx-dev-runtime.d.ts'. ========
+Module resolution kind is not specified, using 'NodeNext'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+Loading module as file / folder, candidate module location '/.src/node_modules/@types/react/', target file types: TypeScript, JavaScript, Declaration.
+File '/.src/node_modules/@types/react/package.json' exists according to earlier cached lookups.
+'package.json' does not have a 'typings' field.
+'package.json' has 'types' field 'index.d.ts' that references '/.src/node_modules/@types/react/index.d.ts'.
+File '/.src/node_modules/@types/react/index.d.ts' exists - use it as a name resolution result.
+======== Module name './' was successfully resolved to '/.src/node_modules/@types/react/index.d.ts'. ========
+======== Resolving type reference directive 'react', containing file '/.src/__inferred type names__.ts', root directory '/.src/node_modules/@types,/node_modules/@types'. ========
+Resolving with primary search path '/.src/node_modules/@types, /node_modules/@types'.
+Found 'package.json' at '/.src/node_modules/@types/react/package.json'.
+'package.json' does not have a 'typesVersions' field.
+'package.json' does not have a 'typings' field.
+'package.json' has 'types' field 'index.d.ts' that references '/.src/node_modules/@types/react/index.d.ts'.
+File '/.src/node_modules/@types/react/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/.src/node_modules/@types/react/index.d.ts', result '/.src/node_modules/@types/react/index.d.ts'.
+======== Type reference directive 'react' was successfully resolved to '/.src/node_modules/@types/react/index.d.ts', primary: true. ========
diff --git a/testdata/baselines/reference/submodule/compiler/reactJsxReactResolvedNodeNextEsm.trace.json b/testdata/baselines/reference/submodule/compiler/reactJsxReactResolvedNodeNextEsm.trace.json
new file mode 100644
index 0000000000..046195fc86
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/reactJsxReactResolvedNodeNextEsm.trace.json
@@ -0,0 +1,40 @@
+======== Resolving module 'react/jsx-runtime' from '/.src/file.tsx'. ========
+Module resolution kind is not specified, using 'NodeNext'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/.src/package.json' exists according to earlier cached lookups.
+Loading module 'react/jsx-runtime' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/.src/node_modules/@types/react/package.json' exists according to earlier cached lookups.
+Using 'exports' subpath './*' with target './jsx-runtime.js'.
+File name '/.src/node_modules/@types/react/jsx-runtime.js' has a '.js' extension - stripping it.
+File '/.src/node_modules/@types/react/jsx-runtime.d.ts' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolving real path for '/.src/node_modules/@types/react/jsx-runtime.d.ts', result '/.src/node_modules/@types/react/jsx-runtime.d.ts'.
+======== Module name 'react/jsx-runtime' was successfully resolved to '/.src/node_modules/@types/react/jsx-runtime.d.ts' with Package ID '@types/react@0.0.1'. ========
+======== Resolving module './' from '/.src/node_modules/@types/react/jsx-runtime.d.ts'. ========
+Module resolution kind is not specified, using 'NodeNext'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+Loading module as file / folder, candidate module location '/.src/node_modules/@types/react/', target file types: TypeScript, JavaScript, Declaration.
+File '/.src/node_modules/@types/react/package.json' exists according to earlier cached lookups.
+'package.json' does not have a 'typings' field.
+'package.json' has 'types' field 'index.d.ts' that references '/.src/node_modules/@types/react/index.d.ts'.
+File '/.src/node_modules/@types/react/index.d.ts' exists - use it as a name resolution result.
+======== Module name './' was successfully resolved to '/.src/node_modules/@types/react/index.d.ts'. ========
+======== Resolving module './' from '/.src/node_modules/@types/react/jsx-dev-runtime.d.ts'. ========
+Module resolution kind is not specified, using 'NodeNext'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+Loading module as file / folder, candidate module location '/.src/node_modules/@types/react/', target file types: TypeScript, JavaScript, Declaration.
+File '/.src/node_modules/@types/react/package.json' exists according to earlier cached lookups.
+'package.json' does not have a 'typings' field.
+'package.json' has 'types' field 'index.d.ts' that references '/.src/node_modules/@types/react/index.d.ts'.
+File '/.src/node_modules/@types/react/index.d.ts' exists - use it as a name resolution result.
+======== Module name './' was successfully resolved to '/.src/node_modules/@types/react/index.d.ts'. ========
+======== Resolving type reference directive 'react', containing file '/.src/__inferred type names__.ts', root directory '/.src/node_modules/@types,/node_modules/@types'. ========
+Resolving with primary search path '/.src/node_modules/@types, /node_modules/@types'.
+Found 'package.json' at '/.src/node_modules/@types/react/package.json'.
+'package.json' does not have a 'typesVersions' field.
+'package.json' does not have a 'typings' field.
+'package.json' has 'types' field 'index.d.ts' that references '/.src/node_modules/@types/react/index.d.ts'.
+File '/.src/node_modules/@types/react/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/.src/node_modules/@types/react/index.d.ts', result '/.src/node_modules/@types/react/index.d.ts'.
+======== Type reference directive 'react' was successfully resolved to '/.src/node_modules/@types/react/index.d.ts', primary: true. ========
diff --git a/testdata/baselines/reference/submodule/compiler/requireOfJsonFileWithoutResolveJsonModuleAndPathMapping.trace.json b/testdata/baselines/reference/submodule/compiler/requireOfJsonFileWithoutResolveJsonModuleAndPathMapping.trace.json
new file mode 100644
index 0000000000..79637e8ac9
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/requireOfJsonFileWithoutResolveJsonModuleAndPathMapping.trace.json
@@ -0,0 +1,34 @@
+======== Resolving module 'foo/bar/foobar.json' from '/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+'paths' option is specified, looking for a pattern to match module name 'foo/bar/foobar.json'.
+Module name 'foo/bar/foobar.json', matched pattern '*'.
+Trying substitution 'node_modules/*', candidate module location: 'node_modules/foo/bar/foobar.json'.
+Loading module as file / folder, candidate module location '/node_modules/foo/bar/foobar.json', target file types: TypeScript, JavaScript, Declaration.
+File name '/node_modules/foo/bar/foobar.json' has a '.json' extension - stripping it.
+File '/node_modules/foo/bar/foobar.d.json.ts' does not exist.
+File '/node_modules/foo/bar/foobar.json.ts' does not exist.
+File '/node_modules/foo/bar/foobar.json.tsx' does not exist.
+File '/node_modules/foo/bar/foobar.json.d.ts' does not exist.
+File '/node_modules/foo/bar/foobar.json.js' does not exist.
+File '/node_modules/foo/bar/foobar.json.jsx' does not exist.
+Directory '/node_modules/foo/bar/foobar.json' does not exist, skipping all lookups in it.
+Trying substitution 'src/types', candidate module location: 'src/types'.
+Loading module as file / folder, candidate module location '/src/types', target file types: TypeScript, JavaScript, Declaration.
+File '/package.json' does not exist.
+Loading module 'foo/bar/foobar.json' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/node_modules/foo/package.json' does not exist.
+File name '/node_modules/foo/bar/foobar.json' has a '.json' extension - stripping it.
+File '/node_modules/foo/bar/foobar.d.json.ts' does not exist.
+File '/node_modules/foo/bar/foobar.json.ts' does not exist.
+File '/node_modules/foo/bar/foobar.json.tsx' does not exist.
+File '/node_modules/foo/bar/foobar.json.d.ts' does not exist.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+File name '/node_modules/@types/foo/bar/foobar.json' has a '.json' extension - stripping it.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript.
+File '/node_modules/foo/package.json' does not exist according to earlier cached lookups.
+File name '/node_modules/foo/bar/foobar.json' has a '.json' extension - stripping it.
+File '/node_modules/foo/bar/foobar.json.js' does not exist.
+File '/node_modules/foo/bar/foobar.json.jsx' does not exist.
+======== Module name 'foo/bar/foobar.json' was not resolved. ========
diff --git a/testdata/baselines/reference/submodule/compiler/requireOfJsonFile_PathMapping.trace.json b/testdata/baselines/reference/submodule/compiler/requireOfJsonFile_PathMapping.trace.json
new file mode 100644
index 0000000000..1c02ac1083
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/requireOfJsonFile_PathMapping.trace.json
@@ -0,0 +1,13 @@
+======== Resolving module 'foo/bar/foobar.json' from '/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+'paths' option is specified, looking for a pattern to match module name 'foo/bar/foobar.json'.
+Module name 'foo/bar/foobar.json', matched pattern '*'.
+Trying substitution 'node_modules/*', candidate module location: 'node_modules/foo/bar/foobar.json'.
+Loading module as file / folder, candidate module location '/node_modules/foo/bar/foobar.json', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/node_modules/foo/bar/foobar.json' has a '.json' extension - stripping it.
+File '/node_modules/foo/bar/foobar.d.json.ts' does not exist.
+File '/node_modules/foo/bar/foobar.json' exists - use it as a name resolution result.
+File '/node_modules/foo/package.json' does not exist.
+Resolving real path for '/node_modules/foo/bar/foobar.json', result '/node_modules/foo/bar/foobar.json'.
+======== Module name 'foo/bar/foobar.json' was successfully resolved to '/node_modules/foo/bar/foobar.json'. ========
diff --git a/testdata/baselines/reference/submodule/compiler/typeReferenceDirectiveScopedPackageCustomTypeRoot.trace.json b/testdata/baselines/reference/submodule/compiler/typeReferenceDirectiveScopedPackageCustomTypeRoot.trace.json
new file mode 100644
index 0000000000..068e6916b8
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/typeReferenceDirectiveScopedPackageCustomTypeRoot.trace.json
@@ -0,0 +1,19 @@
+======== Resolving type reference directive '@scoped', containing file '/__inferred type names__.ts', root directory '/node_modules/@types'. ========
+Resolving with primary search path '/node_modules/@types'.
+File '/node_modules/@types/@scoped/package.json' does not exist.
+File '/node_modules/@types/@scoped/index.d.ts' does not exist.
+Looking up in 'node_modules' folder, initial location '/'.
+Searching all ancestor node_modules directories for preferred extensions: Declaration.
+File '/node_modules/@scoped/package.json' does not exist.
+File '/node_modules/@scoped.d.ts' does not exist.
+File '/node_modules/@scoped/index.d.ts' does not exist.
+File '/node_modules/@types/@scoped/package.json' does not exist according to earlier cached lookups.
+File '/node_modules/@types/@scoped.d.ts' does not exist.
+File '/node_modules/@types/@scoped/index.d.ts' does not exist.
+======== Type reference directive '@scoped' was not resolved. ========
+======== Resolving type reference directive 'mangled__attypescache', containing file '/__inferred type names__.ts', root directory '/node_modules/@types'. ========
+Resolving with primary search path '/node_modules/@types'.
+File '/node_modules/@types/mangled__attypescache/package.json' does not exist.
+File '/node_modules/@types/mangled__attypescache/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/@types/mangled__attypescache/index.d.ts', result '/node_modules/@types/mangled__attypescache/index.d.ts'.
+======== Type reference directive 'mangled__attypescache' was successfully resolved to '/node_modules/@types/mangled__attypescache/index.d.ts', primary: true. ========
diff --git a/testdata/baselines/reference/submodule/compiler/typeReferenceDirectives1.trace.json b/testdata/baselines/reference/submodule/compiler/typeReferenceDirectives1.trace.json
new file mode 100644
index 0000000000..1e674dc278
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/typeReferenceDirectives1.trace.json
@@ -0,0 +1,8 @@
+======== Resolving type reference directive 'lib', containing file '/app.ts', root directory '/node_modules/@types'. ========
+Resolving with primary search path '/node_modules/@types'.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Looking up in 'node_modules' folder, initial location '/'.
+Searching all ancestor node_modules directories for preferred extensions: Declaration.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+======== Type reference directive 'lib' was not resolved. ========
diff --git a/testdata/baselines/reference/submodule/compiler/typeReferenceDirectives10.trace.json b/testdata/baselines/reference/submodule/compiler/typeReferenceDirectives10.trace.json
new file mode 100644
index 0000000000..7f17b6b7cb
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/typeReferenceDirectives10.trace.json
@@ -0,0 +1,16 @@
+======== Resolving type reference directive 'lib', containing file '/app.ts', root directory '/node_modules/@types'. ========
+Resolving with primary search path '/node_modules/@types'.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Looking up in 'node_modules' folder, initial location '/'.
+Searching all ancestor node_modules directories for preferred extensions: Declaration.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+======== Type reference directive 'lib' was not resolved. ========
+======== Resolving module './ref' from '/app.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+Loading module as file / folder, candidate module location '/ref', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/ref.ts' does not exist.
+File '/ref.tsx' does not exist.
+File '/ref.d.ts' exists - use it as a name resolution result.
+======== Module name './ref' was successfully resolved to '/ref.d.ts'. ========
diff --git a/testdata/baselines/reference/submodule/compiler/typeReferenceDirectives11.trace.json b/testdata/baselines/reference/submodule/compiler/typeReferenceDirectives11.trace.json
new file mode 100644
index 0000000000..6031ac457f
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/typeReferenceDirectives11.trace.json
@@ -0,0 +1,6 @@
+======== Resolving module './mod1' from '/mod2.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+Loading module as file / folder, candidate module location '/mod1', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/mod1.ts' exists - use it as a name resolution result.
+======== Module name './mod1' was successfully resolved to '/mod1.ts'. ========
diff --git a/testdata/baselines/reference/submodule/compiler/typeReferenceDirectives12.trace.json b/testdata/baselines/reference/submodule/compiler/typeReferenceDirectives12.trace.json
new file mode 100644
index 0000000000..9c52ca7fa3
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/typeReferenceDirectives12.trace.json
@@ -0,0 +1,32 @@
+======== Resolving module './main' from '/mod2.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+Loading module as file / folder, candidate module location '/main', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/main.ts' exists - use it as a name resolution result.
+======== Module name './main' was successfully resolved to '/main.ts'. ========
+======== Resolving module './mod1' from '/mod2.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+Loading module as file / folder, candidate module location '/mod1', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/mod1.ts' exists - use it as a name resolution result.
+======== Module name './mod1' was successfully resolved to '/mod1.ts'. ========
+======== Resolving type reference directive 'lib', containing file '/mod1.ts', root directory '/node_modules/@types'. ========
+Resolving with primary search path '/node_modules/@types'.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Looking up in 'node_modules' folder, initial location '/'.
+Searching all ancestor node_modules directories for preferred extensions: Declaration.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+======== Type reference directive 'lib' was not resolved. ========
+======== Resolving module './main' from '/mod1.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+Loading module as file / folder, candidate module location '/main', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/main.ts' exists - use it as a name resolution result.
+======== Module name './main' was successfully resolved to '/main.ts'. ========
+======== Resolving module './main' from '/mod1.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+Loading module as file / folder, candidate module location '/main', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/main.ts' exists - use it as a name resolution result.
+======== Module name './main' was successfully resolved to '/main.ts'. ========
diff --git a/testdata/baselines/reference/submodule/compiler/typeReferenceDirectives13.trace.json b/testdata/baselines/reference/submodule/compiler/typeReferenceDirectives13.trace.json
new file mode 100644
index 0000000000..7f17b6b7cb
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/typeReferenceDirectives13.trace.json
@@ -0,0 +1,16 @@
+======== Resolving type reference directive 'lib', containing file '/app.ts', root directory '/node_modules/@types'. ========
+Resolving with primary search path '/node_modules/@types'.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Looking up in 'node_modules' folder, initial location '/'.
+Searching all ancestor node_modules directories for preferred extensions: Declaration.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+======== Type reference directive 'lib' was not resolved. ========
+======== Resolving module './ref' from '/app.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+Loading module as file / folder, candidate module location '/ref', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/ref.ts' does not exist.
+File '/ref.tsx' does not exist.
+File '/ref.d.ts' exists - use it as a name resolution result.
+======== Module name './ref' was successfully resolved to '/ref.d.ts'. ========
diff --git a/testdata/baselines/reference/submodule/compiler/typeReferenceDirectives3.trace.json b/testdata/baselines/reference/submodule/compiler/typeReferenceDirectives3.trace.json
new file mode 100644
index 0000000000..1e674dc278
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/typeReferenceDirectives3.trace.json
@@ -0,0 +1,8 @@
+======== Resolving type reference directive 'lib', containing file '/app.ts', root directory '/node_modules/@types'. ========
+Resolving with primary search path '/node_modules/@types'.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Looking up in 'node_modules' folder, initial location '/'.
+Searching all ancestor node_modules directories for preferred extensions: Declaration.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+======== Type reference directive 'lib' was not resolved. ========
diff --git a/testdata/baselines/reference/submodule/compiler/typeReferenceDirectives4.trace.json b/testdata/baselines/reference/submodule/compiler/typeReferenceDirectives4.trace.json
new file mode 100644
index 0000000000..1e674dc278
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/typeReferenceDirectives4.trace.json
@@ -0,0 +1,8 @@
+======== Resolving type reference directive 'lib', containing file '/app.ts', root directory '/node_modules/@types'. ========
+Resolving with primary search path '/node_modules/@types'.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Looking up in 'node_modules' folder, initial location '/'.
+Searching all ancestor node_modules directories for preferred extensions: Declaration.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+======== Type reference directive 'lib' was not resolved. ========
diff --git a/testdata/baselines/reference/submodule/compiler/typeReferenceDirectives5.trace.json b/testdata/baselines/reference/submodule/compiler/typeReferenceDirectives5.trace.json
new file mode 100644
index 0000000000..7f17b6b7cb
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/typeReferenceDirectives5.trace.json
@@ -0,0 +1,16 @@
+======== Resolving type reference directive 'lib', containing file '/app.ts', root directory '/node_modules/@types'. ========
+Resolving with primary search path '/node_modules/@types'.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Looking up in 'node_modules' folder, initial location '/'.
+Searching all ancestor node_modules directories for preferred extensions: Declaration.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+======== Type reference directive 'lib' was not resolved. ========
+======== Resolving module './ref' from '/app.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+Loading module as file / folder, candidate module location '/ref', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/ref.ts' does not exist.
+File '/ref.tsx' does not exist.
+File '/ref.d.ts' exists - use it as a name resolution result.
+======== Module name './ref' was successfully resolved to '/ref.d.ts'. ========
diff --git a/testdata/baselines/reference/submodule/compiler/typeReferenceDirectives6.trace.json b/testdata/baselines/reference/submodule/compiler/typeReferenceDirectives6.trace.json
new file mode 100644
index 0000000000..1e674dc278
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/typeReferenceDirectives6.trace.json
@@ -0,0 +1,8 @@
+======== Resolving type reference directive 'lib', containing file '/app.ts', root directory '/node_modules/@types'. ========
+Resolving with primary search path '/node_modules/@types'.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Looking up in 'node_modules' folder, initial location '/'.
+Searching all ancestor node_modules directories for preferred extensions: Declaration.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+======== Type reference directive 'lib' was not resolved. ========
diff --git a/testdata/baselines/reference/submodule/compiler/typeReferenceDirectives7.trace.json b/testdata/baselines/reference/submodule/compiler/typeReferenceDirectives7.trace.json
new file mode 100644
index 0000000000..1e674dc278
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/typeReferenceDirectives7.trace.json
@@ -0,0 +1,8 @@
+======== Resolving type reference directive 'lib', containing file '/app.ts', root directory '/node_modules/@types'. ========
+Resolving with primary search path '/node_modules/@types'.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Looking up in 'node_modules' folder, initial location '/'.
+Searching all ancestor node_modules directories for preferred extensions: Declaration.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+======== Type reference directive 'lib' was not resolved. ========
diff --git a/testdata/baselines/reference/submodule/compiler/typeReferenceDirectives8.trace.json b/testdata/baselines/reference/submodule/compiler/typeReferenceDirectives8.trace.json
new file mode 100644
index 0000000000..6031ac457f
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/typeReferenceDirectives8.trace.json
@@ -0,0 +1,6 @@
+======== Resolving module './mod1' from '/mod2.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+Loading module as file / folder, candidate module location '/mod1', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/mod1.ts' exists - use it as a name resolution result.
+======== Module name './mod1' was successfully resolved to '/mod1.ts'. ========
diff --git a/testdata/baselines/reference/submodule/compiler/typeReferenceDirectives9.trace.json b/testdata/baselines/reference/submodule/compiler/typeReferenceDirectives9.trace.json
new file mode 100644
index 0000000000..9c52ca7fa3
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/typeReferenceDirectives9.trace.json
@@ -0,0 +1,32 @@
+======== Resolving module './main' from '/mod2.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+Loading module as file / folder, candidate module location '/main', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/main.ts' exists - use it as a name resolution result.
+======== Module name './main' was successfully resolved to '/main.ts'. ========
+======== Resolving module './mod1' from '/mod2.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+Loading module as file / folder, candidate module location '/mod1', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/mod1.ts' exists - use it as a name resolution result.
+======== Module name './mod1' was successfully resolved to '/mod1.ts'. ========
+======== Resolving type reference directive 'lib', containing file '/mod1.ts', root directory '/node_modules/@types'. ========
+Resolving with primary search path '/node_modules/@types'.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Looking up in 'node_modules' folder, initial location '/'.
+Searching all ancestor node_modules directories for preferred extensions: Declaration.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+======== Type reference directive 'lib' was not resolved. ========
+======== Resolving module './main' from '/mod1.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+Loading module as file / folder, candidate module location '/main', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/main.ts' exists - use it as a name resolution result.
+======== Module name './main' was successfully resolved to '/main.ts'. ========
+======== Resolving module './main' from '/mod1.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+Loading module as file / folder, candidate module location '/main', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/main.ts' exists - use it as a name resolution result.
+======== Module name './main' was successfully resolved to '/main.ts'. ========
diff --git a/testdata/baselines/reference/submodule/compiler/typeRootsFromMultipleNodeModulesDirectories.trace.json b/testdata/baselines/reference/submodule/compiler/typeRootsFromMultipleNodeModulesDirectories.trace.json
new file mode 100644
index 0000000000..2651c0d11f
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/typeRootsFromMultipleNodeModulesDirectories.trace.json
@@ -0,0 +1,97 @@
+======== Resolving module 'xyz' from '/foo/bar/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/foo/bar/package.json' does not exist.
+File '/foo/package.json' does not exist according to earlier cached lookups.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'xyz' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Directory '/foo/bar/node_modules' does not exist, skipping all lookups in it.
+Directory '/foo/bar/node_modules/@types' does not exist, skipping all lookups in it.
+File '/foo/node_modules/xyz.ts' does not exist.
+File '/foo/node_modules/xyz.tsx' does not exist.
+File '/foo/node_modules/xyz.d.ts' does not exist.
+File '/foo/node_modules/@types/xyz.d.ts' does not exist.
+File '/node_modules/xyz.ts' does not exist.
+File '/node_modules/xyz.tsx' does not exist.
+File '/node_modules/xyz.d.ts' does not exist.
+File '/node_modules/@types/xyz.d.ts' does not exist.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript, JSON.
+Directory '/foo/bar/node_modules' does not exist, skipping all lookups in it.
+File '/foo/node_modules/xyz.js' does not exist.
+File '/foo/node_modules/xyz.jsx' does not exist.
+File '/node_modules/xyz.js' does not exist.
+File '/node_modules/xyz.jsx' does not exist.
+======== Module name 'xyz' was not resolved. ========
+======== Resolving module 'pdq' from '/foo/bar/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/foo/bar/package.json' does not exist according to earlier cached lookups.
+File '/foo/package.json' does not exist according to earlier cached lookups.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'pdq' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Directory '/foo/bar/node_modules' does not exist, skipping all lookups in it.
+Directory '/foo/bar/node_modules/@types' does not exist, skipping all lookups in it.
+File '/foo/node_modules/pdq.ts' does not exist.
+File '/foo/node_modules/pdq.tsx' does not exist.
+File '/foo/node_modules/pdq.d.ts' does not exist.
+File '/foo/node_modules/@types/pdq.d.ts' does not exist.
+File '/node_modules/pdq.ts' does not exist.
+File '/node_modules/pdq.tsx' does not exist.
+File '/node_modules/pdq.d.ts' does not exist.
+File '/node_modules/@types/pdq.d.ts' does not exist.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript, JSON.
+Directory '/foo/bar/node_modules' does not exist, skipping all lookups in it.
+File '/foo/node_modules/pdq.js' does not exist.
+File '/foo/node_modules/pdq.jsx' does not exist.
+File '/node_modules/pdq.js' does not exist.
+File '/node_modules/pdq.jsx' does not exist.
+======== Module name 'pdq' was not resolved. ========
+======== Resolving module 'abc' from '/foo/bar/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/foo/bar/package.json' does not exist according to earlier cached lookups.
+File '/foo/package.json' does not exist according to earlier cached lookups.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'abc' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Directory '/foo/bar/node_modules' does not exist, skipping all lookups in it.
+Directory '/foo/bar/node_modules/@types' does not exist, skipping all lookups in it.
+File '/foo/node_modules/abc.ts' does not exist.
+File '/foo/node_modules/abc.tsx' does not exist.
+File '/foo/node_modules/abc.d.ts' does not exist.
+File '/foo/node_modules/@types/abc.d.ts' does not exist.
+File '/node_modules/abc.ts' does not exist.
+File '/node_modules/abc.tsx' does not exist.
+File '/node_modules/abc.d.ts' does not exist.
+File '/node_modules/@types/abc.d.ts' does not exist.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript, JSON.
+Directory '/foo/bar/node_modules' does not exist, skipping all lookups in it.
+File '/foo/node_modules/abc.js' does not exist.
+File '/foo/node_modules/abc.jsx' does not exist.
+File '/node_modules/abc.js' does not exist.
+File '/node_modules/abc.jsx' does not exist.
+======== Module name 'abc' was not resolved. ========
+======== Resolving type reference directive 'grumpy', containing file '/foo/bar/__inferred type names__.ts', root directory '/foo/bar/node_modules/@types,/foo/node_modules/@types,/node_modules/@types'. ========
+Resolving with primary search path '/foo/bar/node_modules/@types, /foo/node_modules/@types, /node_modules/@types'.
+Directory '/foo/bar/node_modules/@types' does not exist, skipping all lookups in it.
+File '/foo/node_modules/@types/grumpy/package.json' does not exist.
+File '/foo/node_modules/@types/grumpy/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/foo/node_modules/@types/grumpy/index.d.ts', result '/foo/node_modules/@types/grumpy/index.d.ts'.
+======== Type reference directive 'grumpy' was successfully resolved to '/foo/node_modules/@types/grumpy/index.d.ts', primary: true. ========
+======== Resolving type reference directive 'sneezy', containing file '/foo/bar/__inferred type names__.ts', root directory '/foo/bar/node_modules/@types,/foo/node_modules/@types,/node_modules/@types'. ========
+Resolving with primary search path '/foo/bar/node_modules/@types, /foo/node_modules/@types, /node_modules/@types'.
+Directory '/foo/bar/node_modules/@types' does not exist, skipping all lookups in it.
+File '/foo/node_modules/@types/sneezy/package.json' does not exist.
+File '/foo/node_modules/@types/sneezy/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/foo/node_modules/@types/sneezy/index.d.ts', result '/foo/node_modules/@types/sneezy/index.d.ts'.
+======== Type reference directive 'sneezy' was successfully resolved to '/foo/node_modules/@types/sneezy/index.d.ts', primary: true. ========
+======== Resolving type reference directive 'dopey', containing file '/foo/bar/__inferred type names__.ts', root directory '/foo/bar/node_modules/@types,/foo/node_modules/@types,/node_modules/@types'. ========
+Resolving with primary search path '/foo/bar/node_modules/@types, /foo/node_modules/@types, /node_modules/@types'.
+Directory '/foo/bar/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/foo/node_modules/@types' does not exist, skipping all lookups in it.
+File '/node_modules/@types/dopey/package.json' does not exist.
+File '/node_modules/@types/dopey/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/@types/dopey/index.d.ts', result '/node_modules/@types/dopey/index.d.ts'.
+======== Type reference directive 'dopey' was successfully resolved to '/node_modules/@types/dopey/index.d.ts', primary: true. ========
diff --git a/testdata/baselines/reference/submodule/compiler/typeRootsFromNodeModulesInParentDirectory.trace.json b/testdata/baselines/reference/submodule/compiler/typeRootsFromNodeModulesInParentDirectory.trace.json
new file mode 100644
index 0000000000..8fd6c9f25a
--- /dev/null
+++ b/testdata/baselines/reference/submodule/compiler/typeRootsFromNodeModulesInParentDirectory.trace.json
@@ -0,0 +1,25 @@
+======== Resolving module 'xyz' from '/src/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/src/package.json' does not exist.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'xyz' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Directory '/src/node_modules' does not exist, skipping all lookups in it.
+Directory '/src/node_modules/@types' does not exist, skipping all lookups in it.
+File '/node_modules/xyz.ts' does not exist.
+File '/node_modules/xyz.tsx' does not exist.
+File '/node_modules/xyz.d.ts' does not exist.
+File '/node_modules/@types/xyz.d.ts' does not exist.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript, JSON.
+Directory '/src/node_modules' does not exist, skipping all lookups in it.
+File '/node_modules/xyz.js' does not exist.
+File '/node_modules/xyz.jsx' does not exist.
+======== Module name 'xyz' was not resolved. ========
+======== Resolving type reference directive 'foo', containing file '/src/__inferred type names__.ts', root directory '/src/node_modules/@types,/node_modules/@types'. ========
+Resolving with primary search path '/src/node_modules/@types, /node_modules/@types'.
+Directory '/src/node_modules/@types' does not exist, skipping all lookups in it.
+File '/node_modules/@types/foo/package.json' does not exist.
+File '/node_modules/@types/foo/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/@types/foo/index.d.ts', result '/node_modules/@types/foo/index.d.ts'.
+======== Type reference directive 'foo' was successfully resolved to '/node_modules/@types/foo/index.d.ts', primary: true. ========
diff --git a/testdata/baselines/reference/submodule/conformance/bundlerConditionsExcludesNode(module=esnext).trace.json b/testdata/baselines/reference/submodule/conformance/bundlerConditionsExcludesNode(module=esnext).trace.json
new file mode 100644
index 0000000000..da55e998b5
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/bundlerConditionsExcludesNode(module=esnext).trace.json
@@ -0,0 +1,20 @@
+======== Resolving module 'conditions' from '/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+File '/package.json' does not exist.
+Loading module 'conditions' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Found 'package.json' at '/node_modules/conditions/package.json'.
+Entering conditional exports.
+Saw non-matching condition 'node'.
+Matched 'exports' condition 'default'.
+Using 'exports' subpath '.' with target './index.web.js'.
+File name '/node_modules/conditions/index.web.js' has a '.js' extension - stripping it.
+File '/node_modules/conditions/index.web.ts' does not exist.
+File '/node_modules/conditions/index.web.tsx' does not exist.
+File '/node_modules/conditions/index.web.d.ts' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolved under condition 'default'.
+Exiting conditional exports.
+Resolving real path for '/node_modules/conditions/index.web.d.ts', result '/node_modules/conditions/index.web.d.ts'.
+======== Module name 'conditions' was successfully resolved to '/node_modules/conditions/index.web.d.ts' with Package ID 'conditions@1.0.0'. ========
diff --git a/testdata/baselines/reference/submodule/conformance/bundlerConditionsExcludesNode(module=preserve).trace.json b/testdata/baselines/reference/submodule/conformance/bundlerConditionsExcludesNode(module=preserve).trace.json
new file mode 100644
index 0000000000..da55e998b5
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/bundlerConditionsExcludesNode(module=preserve).trace.json
@@ -0,0 +1,20 @@
+======== Resolving module 'conditions' from '/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+File '/package.json' does not exist.
+Loading module 'conditions' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Found 'package.json' at '/node_modules/conditions/package.json'.
+Entering conditional exports.
+Saw non-matching condition 'node'.
+Matched 'exports' condition 'default'.
+Using 'exports' subpath '.' with target './index.web.js'.
+File name '/node_modules/conditions/index.web.js' has a '.js' extension - stripping it.
+File '/node_modules/conditions/index.web.ts' does not exist.
+File '/node_modules/conditions/index.web.tsx' does not exist.
+File '/node_modules/conditions/index.web.d.ts' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolved under condition 'default'.
+Exiting conditional exports.
+Resolving real path for '/node_modules/conditions/index.web.d.ts', result '/node_modules/conditions/index.web.d.ts'.
+======== Module name 'conditions' was successfully resolved to '/node_modules/conditions/index.web.d.ts' with Package ID 'conditions@1.0.0'. ========
diff --git a/testdata/baselines/reference/submodule/conformance/bundlerDirectoryModule(module=node18,moduleresolution=bundler).trace.json b/testdata/baselines/reference/submodule/conformance/bundlerDirectoryModule(module=node18,moduleresolution=bundler).trace.json
new file mode 100644
index 0000000000..b295dae88c
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/bundlerDirectoryModule(module=node18,moduleresolution=bundler).trace.json
@@ -0,0 +1,19 @@
+======== Resolving module '../lib' from '/app/test.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+Loading module as file / folder, candidate module location '/lib', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/lib.ts' does not exist.
+File '/lib.tsx' does not exist.
+File '/lib.d.ts' does not exist.
+File '/lib.js' does not exist.
+File '/lib.jsx' does not exist.
+Found 'package.json' at '/lib/package.json'.
+'package.json' does not have a 'typesVersions' field.
+'package.json' does not have a 'typings' field.
+'package.json' does not have a 'types' field.
+'package.json' has 'main' field './cjs/index.js' that references '/lib/cjs/index.js'.
+File name '/lib/cjs/index.js' has a '.js' extension - stripping it.
+File '/lib/cjs/index.ts' does not exist.
+File '/lib/cjs/index.tsx' does not exist.
+File '/lib/cjs/index.d.ts' exists - use it as a name resolution result.
+======== Module name '../lib' was successfully resolved to '/lib/cjs/index.d.ts'. ========
diff --git a/testdata/baselines/reference/submodule/conformance/bundlerDirectoryModule(module=node18,moduleresolution=nodenext).trace.json b/testdata/baselines/reference/submodule/conformance/bundlerDirectoryModule(module=node18,moduleresolution=nodenext).trace.json
new file mode 100644
index 0000000000..6fb3a0bc62
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/bundlerDirectoryModule(module=node18,moduleresolution=nodenext).trace.json
@@ -0,0 +1,19 @@
+======== Resolving module '../lib' from '/app/test.ts'. ========
+Explicitly specified module resolution kind: 'NodeNext'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+Loading module as file / folder, candidate module location '/lib', target file types: TypeScript, JavaScript, Declaration.
+File '/lib.ts' does not exist.
+File '/lib.tsx' does not exist.
+File '/lib.d.ts' does not exist.
+File '/lib.js' does not exist.
+File '/lib.jsx' does not exist.
+Found 'package.json' at '/lib/package.json'.
+'package.json' does not have a 'typesVersions' field.
+'package.json' does not have a 'typings' field.
+'package.json' does not have a 'types' field.
+'package.json' has 'main' field './cjs/index.js' that references '/lib/cjs/index.js'.
+File name '/lib/cjs/index.js' has a '.js' extension - stripping it.
+File '/lib/cjs/index.ts' does not exist.
+File '/lib/cjs/index.tsx' does not exist.
+File '/lib/cjs/index.d.ts' exists - use it as a name resolution result.
+======== Module name '../lib' was successfully resolved to '/lib/cjs/index.d.ts'. ========
diff --git a/testdata/baselines/reference/submodule/conformance/bundlerDirectoryModule(module=nodenext,moduleresolution=bundler).trace.json b/testdata/baselines/reference/submodule/conformance/bundlerDirectoryModule(module=nodenext,moduleresolution=bundler).trace.json
new file mode 100644
index 0000000000..b295dae88c
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/bundlerDirectoryModule(module=nodenext,moduleresolution=bundler).trace.json
@@ -0,0 +1,19 @@
+======== Resolving module '../lib' from '/app/test.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+Loading module as file / folder, candidate module location '/lib', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/lib.ts' does not exist.
+File '/lib.tsx' does not exist.
+File '/lib.d.ts' does not exist.
+File '/lib.js' does not exist.
+File '/lib.jsx' does not exist.
+Found 'package.json' at '/lib/package.json'.
+'package.json' does not have a 'typesVersions' field.
+'package.json' does not have a 'typings' field.
+'package.json' does not have a 'types' field.
+'package.json' has 'main' field './cjs/index.js' that references '/lib/cjs/index.js'.
+File name '/lib/cjs/index.js' has a '.js' extension - stripping it.
+File '/lib/cjs/index.ts' does not exist.
+File '/lib/cjs/index.tsx' does not exist.
+File '/lib/cjs/index.d.ts' exists - use it as a name resolution result.
+======== Module name '../lib' was successfully resolved to '/lib/cjs/index.d.ts'. ========
diff --git a/testdata/baselines/reference/submodule/conformance/bundlerDirectoryModule(module=nodenext,moduleresolution=nodenext).trace.json b/testdata/baselines/reference/submodule/conformance/bundlerDirectoryModule(module=nodenext,moduleresolution=nodenext).trace.json
new file mode 100644
index 0000000000..6fb3a0bc62
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/bundlerDirectoryModule(module=nodenext,moduleresolution=nodenext).trace.json
@@ -0,0 +1,19 @@
+======== Resolving module '../lib' from '/app/test.ts'. ========
+Explicitly specified module resolution kind: 'NodeNext'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+Loading module as file / folder, candidate module location '/lib', target file types: TypeScript, JavaScript, Declaration.
+File '/lib.ts' does not exist.
+File '/lib.tsx' does not exist.
+File '/lib.d.ts' does not exist.
+File '/lib.js' does not exist.
+File '/lib.jsx' does not exist.
+Found 'package.json' at '/lib/package.json'.
+'package.json' does not have a 'typesVersions' field.
+'package.json' does not have a 'typings' field.
+'package.json' does not have a 'types' field.
+'package.json' has 'main' field './cjs/index.js' that references '/lib/cjs/index.js'.
+File name '/lib/cjs/index.js' has a '.js' extension - stripping it.
+File '/lib/cjs/index.ts' does not exist.
+File '/lib/cjs/index.tsx' does not exist.
+File '/lib/cjs/index.d.ts' exists - use it as a name resolution result.
+======== Module name '../lib' was successfully resolved to '/lib/cjs/index.d.ts'. ========
diff --git a/testdata/baselines/reference/submodule/conformance/bundlerImportTsExtensions(allowimportingtsextensions=false,noemit=false).trace.json b/testdata/baselines/reference/submodule/conformance/bundlerImportTsExtensions(allowimportingtsextensions=false,noemit=false).trace.json
new file mode 100644
index 0000000000..226fcdbbe3
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/bundlerImportTsExtensions(allowimportingtsextensions=false,noemit=false).trace.json
@@ -0,0 +1,128 @@
+======== Resolving module './a' from '/project/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/a', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/project/a.ts' exists - use it as a name resolution result.
+======== Module name './a' was successfully resolved to '/project/a.ts'. ========
+======== Resolving module './a.js' from '/project/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/a.js', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/project/a.js' has a '.js' extension - stripping it.
+File '/project/a.ts' exists - use it as a name resolution result.
+======== Module name './a.js' was successfully resolved to '/project/a.ts'. ========
+======== Resolving module './a.ts' from '/project/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/a.ts', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/project/a.ts' has a '.ts' extension - stripping it.
+File '/project/a.ts' exists - use it as a name resolution result.
+======== Module name './a.ts' was successfully resolved to '/project/a.ts'. ========
+======== Resolving module './b' from '/project/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/b', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/project/b.ts' exists - use it as a name resolution result.
+======== Module name './b' was successfully resolved to '/project/b.ts'. ========
+======== Resolving module './b.js' from '/project/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/b.js', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/project/b.js' has a '.js' extension - stripping it.
+File '/project/b.ts' exists - use it as a name resolution result.
+======== Module name './b.js' was successfully resolved to '/project/b.ts'. ========
+======== Resolving module './b.ts' from '/project/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/b.ts', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/project/b.ts' has a '.ts' extension - stripping it.
+File '/project/b.ts' exists - use it as a name resolution result.
+======== Module name './b.ts' was successfully resolved to '/project/b.ts'. ========
+======== Resolving module './b.d.ts' from '/project/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/b.d.ts', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/project/b.d.ts' has a '.d.ts' extension - stripping it.
+File '/project/b.ts' exists - use it as a name resolution result.
+======== Module name './b.d.ts' was successfully resolved to '/project/b.ts'. ========
+======== Resolving module './b.d.ts' from '/project/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/b.d.ts', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/project/b.d.ts' has a '.d.ts' extension - stripping it.
+File '/project/b.ts' exists - use it as a name resolution result.
+======== Module name './b.d.ts' was successfully resolved to '/project/b.ts'. ========
+======== Resolving module './c.ts' from '/project/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/c.ts', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/project/c.ts' has a '.ts' extension - stripping it.
+File '/project/c.ts' exists - use it as a name resolution result.
+======== Module name './c.ts' was successfully resolved to '/project/c.ts'. ========
+======== Resolving module './c.tsx' from '/project/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/c.tsx', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/project/c.tsx' has a '.tsx' extension - stripping it.
+File '/project/c.tsx' exists - use it as a name resolution result.
+======== Module name './c.tsx' was successfully resolved to '/project/c.tsx'. ========
+======== Resolving module './d' from '/project/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/d', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/project/d.ts' does not exist.
+File '/project/d.tsx' does not exist.
+File '/project/d.d.ts' does not exist.
+File '/project/d.js' does not exist.
+File '/project/d.jsx' does not exist.
+File '/project/d/package.json' does not exist.
+File '/project/d/index.ts' exists - use it as a name resolution result.
+======== Module name './d' was successfully resolved to '/project/d/index.ts'. ========
+======== Resolving module './d/index' from '/project/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/d/index', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/project/d/index.ts' exists - use it as a name resolution result.
+======== Module name './d/index' was successfully resolved to '/project/d/index.ts'. ========
+======== Resolving module './d/index.ts' from '/project/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/d/index.ts', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/project/d/index.ts' has a '.ts' extension - stripping it.
+File '/project/d/index.ts' exists - use it as a name resolution result.
+======== Module name './d/index.ts' was successfully resolved to '/project/d/index.ts'. ========
+======== Resolving module './e' from '/project/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/e', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/project/e.ts' exists - use it as a name resolution result.
+======== Module name './e' was successfully resolved to '/project/e.ts'. ========
+======== Resolving module './e.txt' from '/project/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/e.txt', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/project/e.txt' has a '.txt' extension - stripping it.
+File '/project/e.d.txt.ts' does not exist.
+File '/project/e.txt.ts' exists - use it as a name resolution result.
+======== Module name './e.txt' was successfully resolved to '/project/e.txt.ts'. ========
+======== Resolving module './a.ts' from '/project/types.d.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/a.ts', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/project/a.ts' has a '.ts' extension - stripping it.
+File '/project/a.ts' exists - use it as a name resolution result.
+======== Module name './a.ts' was successfully resolved to '/project/a.ts'. ========
+======== Resolving module './a.d.ts' from '/project/types.d.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/a.d.ts', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/project/a.d.ts' has a '.d.ts' extension - stripping it.
+File '/project/a.ts' exists - use it as a name resolution result.
+======== Module name './a.d.ts' was successfully resolved to '/project/a.ts'. ========
+======== Resolving module './a.d.ts' from '/project/types.d.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/a.d.ts', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/project/a.d.ts' has a '.d.ts' extension - stripping it.
+File '/project/a.ts' exists - use it as a name resolution result.
+======== Module name './a.d.ts' was successfully resolved to '/project/a.ts'. ========
diff --git a/testdata/baselines/reference/submodule/conformance/bundlerImportTsExtensions(allowimportingtsextensions=false,noemit=true).trace.json b/testdata/baselines/reference/submodule/conformance/bundlerImportTsExtensions(allowimportingtsextensions=false,noemit=true).trace.json
new file mode 100644
index 0000000000..226fcdbbe3
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/bundlerImportTsExtensions(allowimportingtsextensions=false,noemit=true).trace.json
@@ -0,0 +1,128 @@
+======== Resolving module './a' from '/project/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/a', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/project/a.ts' exists - use it as a name resolution result.
+======== Module name './a' was successfully resolved to '/project/a.ts'. ========
+======== Resolving module './a.js' from '/project/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/a.js', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/project/a.js' has a '.js' extension - stripping it.
+File '/project/a.ts' exists - use it as a name resolution result.
+======== Module name './a.js' was successfully resolved to '/project/a.ts'. ========
+======== Resolving module './a.ts' from '/project/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/a.ts', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/project/a.ts' has a '.ts' extension - stripping it.
+File '/project/a.ts' exists - use it as a name resolution result.
+======== Module name './a.ts' was successfully resolved to '/project/a.ts'. ========
+======== Resolving module './b' from '/project/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/b', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/project/b.ts' exists - use it as a name resolution result.
+======== Module name './b' was successfully resolved to '/project/b.ts'. ========
+======== Resolving module './b.js' from '/project/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/b.js', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/project/b.js' has a '.js' extension - stripping it.
+File '/project/b.ts' exists - use it as a name resolution result.
+======== Module name './b.js' was successfully resolved to '/project/b.ts'. ========
+======== Resolving module './b.ts' from '/project/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/b.ts', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/project/b.ts' has a '.ts' extension - stripping it.
+File '/project/b.ts' exists - use it as a name resolution result.
+======== Module name './b.ts' was successfully resolved to '/project/b.ts'. ========
+======== Resolving module './b.d.ts' from '/project/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/b.d.ts', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/project/b.d.ts' has a '.d.ts' extension - stripping it.
+File '/project/b.ts' exists - use it as a name resolution result.
+======== Module name './b.d.ts' was successfully resolved to '/project/b.ts'. ========
+======== Resolving module './b.d.ts' from '/project/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/b.d.ts', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/project/b.d.ts' has a '.d.ts' extension - stripping it.
+File '/project/b.ts' exists - use it as a name resolution result.
+======== Module name './b.d.ts' was successfully resolved to '/project/b.ts'. ========
+======== Resolving module './c.ts' from '/project/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/c.ts', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/project/c.ts' has a '.ts' extension - stripping it.
+File '/project/c.ts' exists - use it as a name resolution result.
+======== Module name './c.ts' was successfully resolved to '/project/c.ts'. ========
+======== Resolving module './c.tsx' from '/project/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/c.tsx', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/project/c.tsx' has a '.tsx' extension - stripping it.
+File '/project/c.tsx' exists - use it as a name resolution result.
+======== Module name './c.tsx' was successfully resolved to '/project/c.tsx'. ========
+======== Resolving module './d' from '/project/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/d', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/project/d.ts' does not exist.
+File '/project/d.tsx' does not exist.
+File '/project/d.d.ts' does not exist.
+File '/project/d.js' does not exist.
+File '/project/d.jsx' does not exist.
+File '/project/d/package.json' does not exist.
+File '/project/d/index.ts' exists - use it as a name resolution result.
+======== Module name './d' was successfully resolved to '/project/d/index.ts'. ========
+======== Resolving module './d/index' from '/project/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/d/index', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/project/d/index.ts' exists - use it as a name resolution result.
+======== Module name './d/index' was successfully resolved to '/project/d/index.ts'. ========
+======== Resolving module './d/index.ts' from '/project/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/d/index.ts', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/project/d/index.ts' has a '.ts' extension - stripping it.
+File '/project/d/index.ts' exists - use it as a name resolution result.
+======== Module name './d/index.ts' was successfully resolved to '/project/d/index.ts'. ========
+======== Resolving module './e' from '/project/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/e', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/project/e.ts' exists - use it as a name resolution result.
+======== Module name './e' was successfully resolved to '/project/e.ts'. ========
+======== Resolving module './e.txt' from '/project/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/e.txt', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/project/e.txt' has a '.txt' extension - stripping it.
+File '/project/e.d.txt.ts' does not exist.
+File '/project/e.txt.ts' exists - use it as a name resolution result.
+======== Module name './e.txt' was successfully resolved to '/project/e.txt.ts'. ========
+======== Resolving module './a.ts' from '/project/types.d.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/a.ts', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/project/a.ts' has a '.ts' extension - stripping it.
+File '/project/a.ts' exists - use it as a name resolution result.
+======== Module name './a.ts' was successfully resolved to '/project/a.ts'. ========
+======== Resolving module './a.d.ts' from '/project/types.d.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/a.d.ts', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/project/a.d.ts' has a '.d.ts' extension - stripping it.
+File '/project/a.ts' exists - use it as a name resolution result.
+======== Module name './a.d.ts' was successfully resolved to '/project/a.ts'. ========
+======== Resolving module './a.d.ts' from '/project/types.d.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/a.d.ts', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/project/a.d.ts' has a '.d.ts' extension - stripping it.
+File '/project/a.ts' exists - use it as a name resolution result.
+======== Module name './a.d.ts' was successfully resolved to '/project/a.ts'. ========
diff --git a/testdata/baselines/reference/submodule/conformance/bundlerImportTsExtensions(allowimportingtsextensions=true,noemit=false).trace.json b/testdata/baselines/reference/submodule/conformance/bundlerImportTsExtensions(allowimportingtsextensions=true,noemit=false).trace.json
new file mode 100644
index 0000000000..226fcdbbe3
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/bundlerImportTsExtensions(allowimportingtsextensions=true,noemit=false).trace.json
@@ -0,0 +1,128 @@
+======== Resolving module './a' from '/project/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/a', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/project/a.ts' exists - use it as a name resolution result.
+======== Module name './a' was successfully resolved to '/project/a.ts'. ========
+======== Resolving module './a.js' from '/project/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/a.js', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/project/a.js' has a '.js' extension - stripping it.
+File '/project/a.ts' exists - use it as a name resolution result.
+======== Module name './a.js' was successfully resolved to '/project/a.ts'. ========
+======== Resolving module './a.ts' from '/project/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/a.ts', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/project/a.ts' has a '.ts' extension - stripping it.
+File '/project/a.ts' exists - use it as a name resolution result.
+======== Module name './a.ts' was successfully resolved to '/project/a.ts'. ========
+======== Resolving module './b' from '/project/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/b', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/project/b.ts' exists - use it as a name resolution result.
+======== Module name './b' was successfully resolved to '/project/b.ts'. ========
+======== Resolving module './b.js' from '/project/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/b.js', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/project/b.js' has a '.js' extension - stripping it.
+File '/project/b.ts' exists - use it as a name resolution result.
+======== Module name './b.js' was successfully resolved to '/project/b.ts'. ========
+======== Resolving module './b.ts' from '/project/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/b.ts', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/project/b.ts' has a '.ts' extension - stripping it.
+File '/project/b.ts' exists - use it as a name resolution result.
+======== Module name './b.ts' was successfully resolved to '/project/b.ts'. ========
+======== Resolving module './b.d.ts' from '/project/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/b.d.ts', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/project/b.d.ts' has a '.d.ts' extension - stripping it.
+File '/project/b.ts' exists - use it as a name resolution result.
+======== Module name './b.d.ts' was successfully resolved to '/project/b.ts'. ========
+======== Resolving module './b.d.ts' from '/project/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/b.d.ts', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/project/b.d.ts' has a '.d.ts' extension - stripping it.
+File '/project/b.ts' exists - use it as a name resolution result.
+======== Module name './b.d.ts' was successfully resolved to '/project/b.ts'. ========
+======== Resolving module './c.ts' from '/project/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/c.ts', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/project/c.ts' has a '.ts' extension - stripping it.
+File '/project/c.ts' exists - use it as a name resolution result.
+======== Module name './c.ts' was successfully resolved to '/project/c.ts'. ========
+======== Resolving module './c.tsx' from '/project/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/c.tsx', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/project/c.tsx' has a '.tsx' extension - stripping it.
+File '/project/c.tsx' exists - use it as a name resolution result.
+======== Module name './c.tsx' was successfully resolved to '/project/c.tsx'. ========
+======== Resolving module './d' from '/project/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/d', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/project/d.ts' does not exist.
+File '/project/d.tsx' does not exist.
+File '/project/d.d.ts' does not exist.
+File '/project/d.js' does not exist.
+File '/project/d.jsx' does not exist.
+File '/project/d/package.json' does not exist.
+File '/project/d/index.ts' exists - use it as a name resolution result.
+======== Module name './d' was successfully resolved to '/project/d/index.ts'. ========
+======== Resolving module './d/index' from '/project/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/d/index', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/project/d/index.ts' exists - use it as a name resolution result.
+======== Module name './d/index' was successfully resolved to '/project/d/index.ts'. ========
+======== Resolving module './d/index.ts' from '/project/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/d/index.ts', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/project/d/index.ts' has a '.ts' extension - stripping it.
+File '/project/d/index.ts' exists - use it as a name resolution result.
+======== Module name './d/index.ts' was successfully resolved to '/project/d/index.ts'. ========
+======== Resolving module './e' from '/project/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/e', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/project/e.ts' exists - use it as a name resolution result.
+======== Module name './e' was successfully resolved to '/project/e.ts'. ========
+======== Resolving module './e.txt' from '/project/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/e.txt', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/project/e.txt' has a '.txt' extension - stripping it.
+File '/project/e.d.txt.ts' does not exist.
+File '/project/e.txt.ts' exists - use it as a name resolution result.
+======== Module name './e.txt' was successfully resolved to '/project/e.txt.ts'. ========
+======== Resolving module './a.ts' from '/project/types.d.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/a.ts', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/project/a.ts' has a '.ts' extension - stripping it.
+File '/project/a.ts' exists - use it as a name resolution result.
+======== Module name './a.ts' was successfully resolved to '/project/a.ts'. ========
+======== Resolving module './a.d.ts' from '/project/types.d.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/a.d.ts', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/project/a.d.ts' has a '.d.ts' extension - stripping it.
+File '/project/a.ts' exists - use it as a name resolution result.
+======== Module name './a.d.ts' was successfully resolved to '/project/a.ts'. ========
+======== Resolving module './a.d.ts' from '/project/types.d.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/a.d.ts', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/project/a.d.ts' has a '.d.ts' extension - stripping it.
+File '/project/a.ts' exists - use it as a name resolution result.
+======== Module name './a.d.ts' was successfully resolved to '/project/a.ts'. ========
diff --git a/testdata/baselines/reference/submodule/conformance/bundlerImportTsExtensions(allowimportingtsextensions=true,noemit=true).trace.json b/testdata/baselines/reference/submodule/conformance/bundlerImportTsExtensions(allowimportingtsextensions=true,noemit=true).trace.json
new file mode 100644
index 0000000000..226fcdbbe3
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/bundlerImportTsExtensions(allowimportingtsextensions=true,noemit=true).trace.json
@@ -0,0 +1,128 @@
+======== Resolving module './a' from '/project/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/a', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/project/a.ts' exists - use it as a name resolution result.
+======== Module name './a' was successfully resolved to '/project/a.ts'. ========
+======== Resolving module './a.js' from '/project/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/a.js', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/project/a.js' has a '.js' extension - stripping it.
+File '/project/a.ts' exists - use it as a name resolution result.
+======== Module name './a.js' was successfully resolved to '/project/a.ts'. ========
+======== Resolving module './a.ts' from '/project/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/a.ts', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/project/a.ts' has a '.ts' extension - stripping it.
+File '/project/a.ts' exists - use it as a name resolution result.
+======== Module name './a.ts' was successfully resolved to '/project/a.ts'. ========
+======== Resolving module './b' from '/project/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/b', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/project/b.ts' exists - use it as a name resolution result.
+======== Module name './b' was successfully resolved to '/project/b.ts'. ========
+======== Resolving module './b.js' from '/project/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/b.js', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/project/b.js' has a '.js' extension - stripping it.
+File '/project/b.ts' exists - use it as a name resolution result.
+======== Module name './b.js' was successfully resolved to '/project/b.ts'. ========
+======== Resolving module './b.ts' from '/project/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/b.ts', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/project/b.ts' has a '.ts' extension - stripping it.
+File '/project/b.ts' exists - use it as a name resolution result.
+======== Module name './b.ts' was successfully resolved to '/project/b.ts'. ========
+======== Resolving module './b.d.ts' from '/project/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/b.d.ts', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/project/b.d.ts' has a '.d.ts' extension - stripping it.
+File '/project/b.ts' exists - use it as a name resolution result.
+======== Module name './b.d.ts' was successfully resolved to '/project/b.ts'. ========
+======== Resolving module './b.d.ts' from '/project/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/b.d.ts', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/project/b.d.ts' has a '.d.ts' extension - stripping it.
+File '/project/b.ts' exists - use it as a name resolution result.
+======== Module name './b.d.ts' was successfully resolved to '/project/b.ts'. ========
+======== Resolving module './c.ts' from '/project/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/c.ts', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/project/c.ts' has a '.ts' extension - stripping it.
+File '/project/c.ts' exists - use it as a name resolution result.
+======== Module name './c.ts' was successfully resolved to '/project/c.ts'. ========
+======== Resolving module './c.tsx' from '/project/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/c.tsx', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/project/c.tsx' has a '.tsx' extension - stripping it.
+File '/project/c.tsx' exists - use it as a name resolution result.
+======== Module name './c.tsx' was successfully resolved to '/project/c.tsx'. ========
+======== Resolving module './d' from '/project/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/d', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/project/d.ts' does not exist.
+File '/project/d.tsx' does not exist.
+File '/project/d.d.ts' does not exist.
+File '/project/d.js' does not exist.
+File '/project/d.jsx' does not exist.
+File '/project/d/package.json' does not exist.
+File '/project/d/index.ts' exists - use it as a name resolution result.
+======== Module name './d' was successfully resolved to '/project/d/index.ts'. ========
+======== Resolving module './d/index' from '/project/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/d/index', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/project/d/index.ts' exists - use it as a name resolution result.
+======== Module name './d/index' was successfully resolved to '/project/d/index.ts'. ========
+======== Resolving module './d/index.ts' from '/project/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/d/index.ts', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/project/d/index.ts' has a '.ts' extension - stripping it.
+File '/project/d/index.ts' exists - use it as a name resolution result.
+======== Module name './d/index.ts' was successfully resolved to '/project/d/index.ts'. ========
+======== Resolving module './e' from '/project/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/e', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/project/e.ts' exists - use it as a name resolution result.
+======== Module name './e' was successfully resolved to '/project/e.ts'. ========
+======== Resolving module './e.txt' from '/project/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/e.txt', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/project/e.txt' has a '.txt' extension - stripping it.
+File '/project/e.d.txt.ts' does not exist.
+File '/project/e.txt.ts' exists - use it as a name resolution result.
+======== Module name './e.txt' was successfully resolved to '/project/e.txt.ts'. ========
+======== Resolving module './a.ts' from '/project/types.d.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/a.ts', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/project/a.ts' has a '.ts' extension - stripping it.
+File '/project/a.ts' exists - use it as a name resolution result.
+======== Module name './a.ts' was successfully resolved to '/project/a.ts'. ========
+======== Resolving module './a.d.ts' from '/project/types.d.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/a.d.ts', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/project/a.d.ts' has a '.d.ts' extension - stripping it.
+File '/project/a.ts' exists - use it as a name resolution result.
+======== Module name './a.d.ts' was successfully resolved to '/project/a.ts'. ========
+======== Resolving module './a.d.ts' from '/project/types.d.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/project/a.d.ts', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/project/a.d.ts' has a '.d.ts' extension - stripping it.
+File '/project/a.ts' exists - use it as a name resolution result.
+======== Module name './a.d.ts' was successfully resolved to '/project/a.ts'. ========
diff --git a/testdata/baselines/reference/submodule/conformance/bundlerNodeModules1(module=esnext).trace.json b/testdata/baselines/reference/submodule/conformance/bundlerNodeModules1(module=esnext).trace.json
new file mode 100644
index 0000000000..0e7da888eb
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/bundlerNodeModules1(module=esnext).trace.json
@@ -0,0 +1,57 @@
+======== Resolving module 'dual' from '/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'dual' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/node_modules/dual/package.json' exists according to earlier cached lookups.
+Entering conditional exports.
+Matched 'exports' condition 'import'.
+Using 'exports' subpath '.' with target './index.js'.
+File name '/node_modules/dual/index.js' has a '.js' extension - stripping it.
+File '/node_modules/dual/index.ts' does not exist.
+File '/node_modules/dual/index.tsx' does not exist.
+File '/node_modules/dual/index.d.ts' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolved under condition 'import'.
+Exiting conditional exports.
+Resolving real path for '/node_modules/dual/index.d.ts', result '/node_modules/dual/index.d.ts'.
+======== Module name 'dual' was successfully resolved to '/node_modules/dual/index.d.ts' with Package ID 'dual@1.0.0'. ========
+======== Resolving module 'dual' from '/main.mts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'dual' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/node_modules/dual/package.json' exists according to earlier cached lookups.
+Entering conditional exports.
+Matched 'exports' condition 'import'.
+Using 'exports' subpath '.' with target './index.js'.
+File name '/node_modules/dual/index.js' has a '.js' extension - stripping it.
+File '/node_modules/dual/index.ts' does not exist.
+File '/node_modules/dual/index.tsx' does not exist.
+File '/node_modules/dual/index.d.ts' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolved under condition 'import'.
+Exiting conditional exports.
+Resolving real path for '/node_modules/dual/index.d.ts', result '/node_modules/dual/index.d.ts'.
+======== Module name 'dual' was successfully resolved to '/node_modules/dual/index.d.ts' with Package ID 'dual@1.0.0'. ========
+======== Resolving module 'dual' from '/main.cts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/package.json' does not exist.
+Loading module 'dual' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Found 'package.json' at '/node_modules/dual/package.json'.
+Entering conditional exports.
+Saw non-matching condition 'import'.
+Matched 'exports' condition 'require'.
+Using 'exports' subpath '.' with target './index.cjs'.
+File name '/node_modules/dual/index.cjs' has a '.cjs' extension - stripping it.
+File '/node_modules/dual/index.cts' does not exist.
+File '/node_modules/dual/index.d.cts' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolved under condition 'require'.
+Exiting conditional exports.
+Resolving real path for '/node_modules/dual/index.d.cts', result '/node_modules/dual/index.d.cts'.
+======== Module name 'dual' was successfully resolved to '/node_modules/dual/index.d.cts' with Package ID 'dual@1.0.0'. ========
diff --git a/testdata/baselines/reference/submodule/conformance/bundlerNodeModules1(module=preserve).trace.json b/testdata/baselines/reference/submodule/conformance/bundlerNodeModules1(module=preserve).trace.json
new file mode 100644
index 0000000000..0e7da888eb
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/bundlerNodeModules1(module=preserve).trace.json
@@ -0,0 +1,57 @@
+======== Resolving module 'dual' from '/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'dual' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/node_modules/dual/package.json' exists according to earlier cached lookups.
+Entering conditional exports.
+Matched 'exports' condition 'import'.
+Using 'exports' subpath '.' with target './index.js'.
+File name '/node_modules/dual/index.js' has a '.js' extension - stripping it.
+File '/node_modules/dual/index.ts' does not exist.
+File '/node_modules/dual/index.tsx' does not exist.
+File '/node_modules/dual/index.d.ts' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolved under condition 'import'.
+Exiting conditional exports.
+Resolving real path for '/node_modules/dual/index.d.ts', result '/node_modules/dual/index.d.ts'.
+======== Module name 'dual' was successfully resolved to '/node_modules/dual/index.d.ts' with Package ID 'dual@1.0.0'. ========
+======== Resolving module 'dual' from '/main.mts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'dual' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/node_modules/dual/package.json' exists according to earlier cached lookups.
+Entering conditional exports.
+Matched 'exports' condition 'import'.
+Using 'exports' subpath '.' with target './index.js'.
+File name '/node_modules/dual/index.js' has a '.js' extension - stripping it.
+File '/node_modules/dual/index.ts' does not exist.
+File '/node_modules/dual/index.tsx' does not exist.
+File '/node_modules/dual/index.d.ts' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolved under condition 'import'.
+Exiting conditional exports.
+Resolving real path for '/node_modules/dual/index.d.ts', result '/node_modules/dual/index.d.ts'.
+======== Module name 'dual' was successfully resolved to '/node_modules/dual/index.d.ts' with Package ID 'dual@1.0.0'. ========
+======== Resolving module 'dual' from '/main.cts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/package.json' does not exist.
+Loading module 'dual' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Found 'package.json' at '/node_modules/dual/package.json'.
+Entering conditional exports.
+Saw non-matching condition 'import'.
+Matched 'exports' condition 'require'.
+Using 'exports' subpath '.' with target './index.cjs'.
+File name '/node_modules/dual/index.cjs' has a '.cjs' extension - stripping it.
+File '/node_modules/dual/index.cts' does not exist.
+File '/node_modules/dual/index.d.cts' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolved under condition 'require'.
+Exiting conditional exports.
+Resolving real path for '/node_modules/dual/index.d.cts', result '/node_modules/dual/index.d.cts'.
+======== Module name 'dual' was successfully resolved to '/node_modules/dual/index.d.cts' with Package ID 'dual@1.0.0'. ========
diff --git a/testdata/baselines/reference/submodule/conformance/bundlerRelative1(module=esnext).trace.json b/testdata/baselines/reference/submodule/conformance/bundlerRelative1(module=esnext).trace.json
new file mode 100644
index 0000000000..348f217046
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/bundlerRelative1(module=esnext).trace.json
@@ -0,0 +1,97 @@
+======== Resolving module './dir' from '/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/dir', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/dir.ts' does not exist.
+File '/dir.tsx' does not exist.
+File '/dir.d.ts' does not exist.
+File '/dir.js' does not exist.
+File '/dir.jsx' does not exist.
+File '/dir/package.json' does not exist.
+File '/dir/index.ts' exists - use it as a name resolution result.
+======== Module name './dir' was successfully resolved to '/dir/index.ts'. ========
+======== Resolving module './dir/index' from '/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/dir/index', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/dir/index.ts' exists - use it as a name resolution result.
+======== Module name './dir/index' was successfully resolved to '/dir/index.ts'. ========
+======== Resolving module './dir/index.js' from '/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/dir/index.js', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/dir/index.js' has a '.js' extension - stripping it.
+File '/dir/index.ts' exists - use it as a name resolution result.
+======== Module name './dir/index.js' was successfully resolved to '/dir/index.ts'. ========
+======== Resolving module './dir/index.ts' from '/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/dir/index.ts', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/dir/index.ts' has a '.ts' extension - stripping it.
+File '/dir/index.ts' exists - use it as a name resolution result.
+======== Module name './dir/index.ts' was successfully resolved to '/dir/index.ts'. ========
+======== Resolving module './redirect' from '/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/redirect', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/redirect.ts' does not exist.
+File '/redirect.tsx' does not exist.
+File '/redirect.d.ts' does not exist.
+File '/redirect.js' does not exist.
+File '/redirect.jsx' does not exist.
+Found 'package.json' at '/redirect/package.json'.
+'package.json' does not have a 'typesVersions' field.
+'package.json' does not have a 'typings' field.
+'package.json' does not have a 'types' field.
+'package.json' has 'main' field '../foo' that references '/foo'.
+Loading module as file / folder, candidate module location '/foo', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/foo.ts' does not exist.
+File '/foo.tsx' does not exist.
+File '/foo.d.ts' does not exist.
+File '/foo.js' does not exist.
+File '/foo.jsx' does not exist.
+File '/foo/index.ts' exists - use it as a name resolution result.
+======== Module name './redirect' was successfully resolved to '/foo/index.ts'. ========
+======== Resolving module './redirect/index' from '/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/redirect/index', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/redirect/index.ts' does not exist.
+File '/redirect/index.tsx' does not exist.
+File '/redirect/index.d.ts' does not exist.
+File '/redirect/index.js' does not exist.
+File '/redirect/index.jsx' does not exist.
+Directory '/redirect/index' does not exist, skipping all lookups in it.
+======== Module name './redirect/index' was not resolved. ========
+======== Resolving module './types/esm' from '/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/types/esm', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/types/esm.ts' does not exist.
+File '/types/esm.tsx' does not exist.
+File '/types/esm.d.ts' exists - use it as a name resolution result.
+======== Module name './types/esm' was successfully resolved to '/types/esm.d.ts'. ========
+======== Resolving module './types/esm' from '/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/types/esm', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/types/esm.ts' does not exist.
+File '/types/esm.tsx' does not exist.
+File '/types/esm.d.ts' exists - use it as a name resolution result.
+======== Module name './types/esm' was successfully resolved to '/types/esm.d.ts'. ========
+======== Resolving module './types/cjs' from '/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/types/cjs', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/types/cjs.ts' does not exist.
+File '/types/cjs.tsx' does not exist.
+File '/types/cjs.d.ts' exists - use it as a name resolution result.
+======== Module name './types/cjs' was successfully resolved to '/types/cjs.d.ts'. ========
+======== Resolving module './types/cjs' from '/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/types/cjs', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/types/cjs.ts' does not exist.
+File '/types/cjs.tsx' does not exist.
+File '/types/cjs.d.ts' exists - use it as a name resolution result.
+======== Module name './types/cjs' was successfully resolved to '/types/cjs.d.ts'. ========
diff --git a/testdata/baselines/reference/submodule/conformance/bundlerRelative1(module=preserve).trace.json b/testdata/baselines/reference/submodule/conformance/bundlerRelative1(module=preserve).trace.json
new file mode 100644
index 0000000000..348f217046
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/bundlerRelative1(module=preserve).trace.json
@@ -0,0 +1,97 @@
+======== Resolving module './dir' from '/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/dir', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/dir.ts' does not exist.
+File '/dir.tsx' does not exist.
+File '/dir.d.ts' does not exist.
+File '/dir.js' does not exist.
+File '/dir.jsx' does not exist.
+File '/dir/package.json' does not exist.
+File '/dir/index.ts' exists - use it as a name resolution result.
+======== Module name './dir' was successfully resolved to '/dir/index.ts'. ========
+======== Resolving module './dir/index' from '/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/dir/index', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/dir/index.ts' exists - use it as a name resolution result.
+======== Module name './dir/index' was successfully resolved to '/dir/index.ts'. ========
+======== Resolving module './dir/index.js' from '/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/dir/index.js', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/dir/index.js' has a '.js' extension - stripping it.
+File '/dir/index.ts' exists - use it as a name resolution result.
+======== Module name './dir/index.js' was successfully resolved to '/dir/index.ts'. ========
+======== Resolving module './dir/index.ts' from '/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/dir/index.ts', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/dir/index.ts' has a '.ts' extension - stripping it.
+File '/dir/index.ts' exists - use it as a name resolution result.
+======== Module name './dir/index.ts' was successfully resolved to '/dir/index.ts'. ========
+======== Resolving module './redirect' from '/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/redirect', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/redirect.ts' does not exist.
+File '/redirect.tsx' does not exist.
+File '/redirect.d.ts' does not exist.
+File '/redirect.js' does not exist.
+File '/redirect.jsx' does not exist.
+Found 'package.json' at '/redirect/package.json'.
+'package.json' does not have a 'typesVersions' field.
+'package.json' does not have a 'typings' field.
+'package.json' does not have a 'types' field.
+'package.json' has 'main' field '../foo' that references '/foo'.
+Loading module as file / folder, candidate module location '/foo', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/foo.ts' does not exist.
+File '/foo.tsx' does not exist.
+File '/foo.d.ts' does not exist.
+File '/foo.js' does not exist.
+File '/foo.jsx' does not exist.
+File '/foo/index.ts' exists - use it as a name resolution result.
+======== Module name './redirect' was successfully resolved to '/foo/index.ts'. ========
+======== Resolving module './redirect/index' from '/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/redirect/index', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/redirect/index.ts' does not exist.
+File '/redirect/index.tsx' does not exist.
+File '/redirect/index.d.ts' does not exist.
+File '/redirect/index.js' does not exist.
+File '/redirect/index.jsx' does not exist.
+Directory '/redirect/index' does not exist, skipping all lookups in it.
+======== Module name './redirect/index' was not resolved. ========
+======== Resolving module './types/esm' from '/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/types/esm', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/types/esm.ts' does not exist.
+File '/types/esm.tsx' does not exist.
+File '/types/esm.d.ts' exists - use it as a name resolution result.
+======== Module name './types/esm' was successfully resolved to '/types/esm.d.ts'. ========
+======== Resolving module './types/esm' from '/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/types/esm', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/types/esm.ts' does not exist.
+File '/types/esm.tsx' does not exist.
+File '/types/esm.d.ts' exists - use it as a name resolution result.
+======== Module name './types/esm' was successfully resolved to '/types/esm.d.ts'. ========
+======== Resolving module './types/cjs' from '/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/types/cjs', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/types/cjs.ts' does not exist.
+File '/types/cjs.tsx' does not exist.
+File '/types/cjs.d.ts' exists - use it as a name resolution result.
+======== Module name './types/cjs' was successfully resolved to '/types/cjs.d.ts'. ========
+======== Resolving module './types/cjs' from '/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+Loading module as file / folder, candidate module location '/types/cjs', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/types/cjs.ts' does not exist.
+File '/types/cjs.tsx' does not exist.
+File '/types/cjs.d.ts' exists - use it as a name resolution result.
+======== Module name './types/cjs' was successfully resolved to '/types/cjs.d.ts'. ========
diff --git a/testdata/baselines/reference/submodule/conformance/conditionalExportsResolutionFallback(moduleresolution=bundler).trace.json b/testdata/baselines/reference/submodule/conformance/conditionalExportsResolutionFallback(moduleresolution=bundler).trace.json
new file mode 100644
index 0000000000..6ab1ae8a5f
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/conditionalExportsResolutionFallback(moduleresolution=bundler).trace.json
@@ -0,0 +1,23 @@
+======== Resolving module 'dep' from '/index.mts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+File '/package.json' does not exist.
+Loading module 'dep' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Found 'package.json' at '/node_modules/dep/package.json'.
+Entering conditional exports.
+Matched 'exports' condition 'import'.
+Using 'exports' subpath '.' with target './dist/index.mjs'.
+File name '/node_modules/dep/dist/index.mjs' has a '.mjs' extension - stripping it.
+File '/node_modules/dep/dist/index.mts' does not exist.
+File '/node_modules/dep/dist/index.d.mts' does not exist.
+Failed to resolve under condition 'import'.
+Saw non-matching condition 'require'.
+Matched 'exports' condition 'types'.
+Using 'exports' subpath '.' with target './dist/index.d.ts'.
+File '/node_modules/dep/dist/index.d.ts' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolved under condition 'types'.
+Exiting conditional exports.
+Resolving real path for '/node_modules/dep/dist/index.d.ts', result '/node_modules/dep/dist/index.d.ts'.
+======== Module name 'dep' was successfully resolved to '/node_modules/dep/dist/index.d.ts' with Package ID 'dep@1.0.0'. ========
diff --git a/testdata/baselines/reference/submodule/conformance/conditionalExportsResolutionFallback(moduleresolution=node16).trace.json b/testdata/baselines/reference/submodule/conformance/conditionalExportsResolutionFallback(moduleresolution=node16).trace.json
new file mode 100644
index 0000000000..b6bcab4eb7
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/conditionalExportsResolutionFallback(moduleresolution=node16).trace.json
@@ -0,0 +1,23 @@
+======== Resolving module 'dep' from '/index.mts'. ========
+Explicitly specified module resolution kind: 'Node16'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/package.json' does not exist.
+Loading module 'dep' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Found 'package.json' at '/node_modules/dep/package.json'.
+Entering conditional exports.
+Matched 'exports' condition 'import'.
+Using 'exports' subpath '.' with target './dist/index.mjs'.
+File name '/node_modules/dep/dist/index.mjs' has a '.mjs' extension - stripping it.
+File '/node_modules/dep/dist/index.mts' does not exist.
+File '/node_modules/dep/dist/index.d.mts' does not exist.
+Failed to resolve under condition 'import'.
+Saw non-matching condition 'require'.
+Matched 'exports' condition 'types'.
+Using 'exports' subpath '.' with target './dist/index.d.ts'.
+File '/node_modules/dep/dist/index.d.ts' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolved under condition 'types'.
+Exiting conditional exports.
+Resolving real path for '/node_modules/dep/dist/index.d.ts', result '/node_modules/dep/dist/index.d.ts'.
+======== Module name 'dep' was successfully resolved to '/node_modules/dep/dist/index.d.ts' with Package ID 'dep@1.0.0'. ========
diff --git a/testdata/baselines/reference/submodule/conformance/conditionalExportsResolutionFallback(moduleresolution=nodenext).trace.json b/testdata/baselines/reference/submodule/conformance/conditionalExportsResolutionFallback(moduleresolution=nodenext).trace.json
new file mode 100644
index 0000000000..db9b927d97
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/conditionalExportsResolutionFallback(moduleresolution=nodenext).trace.json
@@ -0,0 +1,23 @@
+======== Resolving module 'dep' from '/index.mts'. ========
+Explicitly specified module resolution kind: 'NodeNext'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/package.json' does not exist.
+Loading module 'dep' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Found 'package.json' at '/node_modules/dep/package.json'.
+Entering conditional exports.
+Matched 'exports' condition 'import'.
+Using 'exports' subpath '.' with target './dist/index.mjs'.
+File name '/node_modules/dep/dist/index.mjs' has a '.mjs' extension - stripping it.
+File '/node_modules/dep/dist/index.mts' does not exist.
+File '/node_modules/dep/dist/index.d.mts' does not exist.
+Failed to resolve under condition 'import'.
+Saw non-matching condition 'require'.
+Matched 'exports' condition 'types'.
+Using 'exports' subpath '.' with target './dist/index.d.ts'.
+File '/node_modules/dep/dist/index.d.ts' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolved under condition 'types'.
+Exiting conditional exports.
+Resolving real path for '/node_modules/dep/dist/index.d.ts', result '/node_modules/dep/dist/index.d.ts'.
+======== Module name 'dep' was successfully resolved to '/node_modules/dep/dist/index.d.ts' with Package ID 'dep@1.0.0'. ========
diff --git a/testdata/baselines/reference/submodule/conformance/customConditions(resolvepackagejsonexports=false).trace.json b/testdata/baselines/reference/submodule/conformance/customConditions(resolvepackagejsonexports=false).trace.json
new file mode 100644
index 0000000000..a8379a790b
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/customConditions(resolvepackagejsonexports=false).trace.json
@@ -0,0 +1,21 @@
+======== Resolving module 'lodash' from '/index.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+File '/package.json' does not exist.
+Loading module 'lodash' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Found 'package.json' at '/node_modules/lodash/package.json'.
+File '/node_modules/lodash.ts' does not exist.
+File '/node_modules/lodash.tsx' does not exist.
+File '/node_modules/lodash.d.ts' does not exist.
+'package.json' does not have a 'typesVersions' field.
+'package.json' does not have a 'typings' field.
+'package.json' does not have a 'types' field.
+'package.json' has 'main' field 'index.js' that references '/node_modules/lodash/index.js'.
+File name '/node_modules/lodash/index.js' has a '.js' extension - stripping it.
+File '/node_modules/lodash/index.ts' does not exist.
+File '/node_modules/lodash/index.tsx' does not exist.
+File '/node_modules/lodash/index.d.ts' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolving real path for '/node_modules/lodash/index.d.ts', result '/node_modules/lodash/index.d.ts'.
+======== Module name 'lodash' was successfully resolved to '/node_modules/lodash/index.d.ts' with Package ID 'lodash@1.0.0'. ========
diff --git a/testdata/baselines/reference/submodule/conformance/customConditions(resolvepackagejsonexports=true).trace.json b/testdata/baselines/reference/submodule/conformance/customConditions(resolvepackagejsonexports=true).trace.json
new file mode 100644
index 0000000000..91a2907b8a
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/customConditions(resolvepackagejsonexports=true).trace.json
@@ -0,0 +1,21 @@
+======== Resolving module 'lodash' from '/index.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+File '/package.json' does not exist.
+Loading module 'lodash' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Found 'package.json' at '/node_modules/lodash/package.json'.
+Entering conditional exports.
+Saw non-matching condition 'browser'.
+Saw non-matching condition 'webpack'.
+Matched 'exports' condition 'default'.
+Using 'exports' subpath '.' with target './index.js'.
+File name '/node_modules/lodash/index.js' has a '.js' extension - stripping it.
+File '/node_modules/lodash/index.ts' does not exist.
+File '/node_modules/lodash/index.tsx' does not exist.
+File '/node_modules/lodash/index.d.ts' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolved under condition 'default'.
+Exiting conditional exports.
+Resolving real path for '/node_modules/lodash/index.d.ts', result '/node_modules/lodash/index.d.ts'.
+======== Module name 'lodash' was successfully resolved to '/node_modules/lodash/index.d.ts' with Package ID 'lodash@1.0.0'. ========
diff --git a/testdata/baselines/reference/submodule/conformance/library-reference-1.trace.json b/testdata/baselines/reference/submodule/conformance/library-reference-1.trace.json
new file mode 100644
index 0000000000..81c5a2b48a
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/library-reference-1.trace.json
@@ -0,0 +1,11 @@
+======== Resolving type reference directive 'jquery', containing file '/src/consumer.ts', root directory '/.src/node_modules/@types,/node_modules/@types'. ========
+Resolving with primary search path '/.src/node_modules/@types, /node_modules/@types'.
+Directory '/.src/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Looking up in 'node_modules' folder, initial location '/src'.
+Searching all ancestor node_modules directories for preferred extensions: Declaration.
+Directory '/src/node_modules' does not exist, skipping all lookups in it.
+Directory '/src/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+======== Type reference directive 'jquery' was not resolved. ========
diff --git a/testdata/baselines/reference/submodule/conformance/library-reference-10.trace.json b/testdata/baselines/reference/submodule/conformance/library-reference-10.trace.json
new file mode 100644
index 0000000000..4430d19bf0
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/library-reference-10.trace.json
@@ -0,0 +1,11 @@
+======== Resolving type reference directive 'jquery', containing file '/foo/consumer.ts', root directory '/.src/node_modules/@types,/node_modules/@types'. ========
+Resolving with primary search path '/.src/node_modules/@types, /node_modules/@types'.
+Directory '/.src/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Looking up in 'node_modules' folder, initial location '/foo'.
+Searching all ancestor node_modules directories for preferred extensions: Declaration.
+Directory '/foo/node_modules' does not exist, skipping all lookups in it.
+Directory '/foo/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+======== Type reference directive 'jquery' was not resolved. ========
diff --git a/testdata/baselines/reference/submodule/conformance/library-reference-11.trace.json b/testdata/baselines/reference/submodule/conformance/library-reference-11.trace.json
new file mode 100644
index 0000000000..29e08ea81f
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/library-reference-11.trace.json
@@ -0,0 +1,14 @@
+======== Resolving type reference directive 'jquery', containing file '/a/b/consumer.ts', root directory '/node_modules/@types'. ========
+Resolving with primary search path '/node_modules/@types'.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Looking up in 'node_modules' folder, initial location '/a/b'.
+Searching all ancestor node_modules directories for preferred extensions: Declaration.
+Directory '/a/b/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/node_modules/@types' does not exist, skipping all lookups in it.
+Found 'package.json' at '/a/node_modules/jquery/package.json'.
+File '/a/node_modules/jquery.d.ts' does not exist.
+'package.json' does not have a 'typesVersions' field.
+'package.json' has 'typings' field 'jquery.d.ts' that references '/a/node_modules/jquery/jquery.d.ts'.
+File '/a/node_modules/jquery/jquery.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/a/node_modules/jquery/jquery.d.ts', result '/a/node_modules/jquery/jquery.d.ts'.
+======== Type reference directive 'jquery' was successfully resolved to '/a/node_modules/jquery/jquery.d.ts', primary: false. ========
diff --git a/testdata/baselines/reference/submodule/conformance/library-reference-12.trace.json b/testdata/baselines/reference/submodule/conformance/library-reference-12.trace.json
new file mode 100644
index 0000000000..c36ef8d0ab
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/library-reference-12.trace.json
@@ -0,0 +1,15 @@
+======== Resolving type reference directive 'jquery', containing file '/a/b/consumer.ts', root directory '/node_modules/@types'. ========
+Resolving with primary search path '/node_modules/@types'.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Looking up in 'node_modules' folder, initial location '/a/b'.
+Searching all ancestor node_modules directories for preferred extensions: Declaration.
+Directory '/a/b/node_modules' does not exist, skipping all lookups in it.
+Directory '/a/b/node_modules/@types' does not exist, skipping all lookups in it.
+Found 'package.json' at '/a/node_modules/jquery/package.json'.
+File '/a/node_modules/jquery.d.ts' does not exist.
+'package.json' does not have a 'typesVersions' field.
+'package.json' does not have a 'typings' field.
+'package.json' has 'types' field 'dist/jquery.d.ts' that references '/a/node_modules/jquery/dist/jquery.d.ts'.
+File '/a/node_modules/jquery/dist/jquery.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/a/node_modules/jquery/dist/jquery.d.ts', result '/a/node_modules/jquery/dist/jquery.d.ts'.
+======== Type reference directive 'jquery' was successfully resolved to '/a/node_modules/jquery/dist/jquery.d.ts', primary: false. ========
diff --git a/testdata/baselines/reference/submodule/conformance/library-reference-13.trace.json b/testdata/baselines/reference/submodule/conformance/library-reference-13.trace.json
new file mode 100644
index 0000000000..cdc64d65fc
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/library-reference-13.trace.json
@@ -0,0 +1,7 @@
+======== Resolving type reference directive 'jquery', containing file '/a/__inferred type names__.ts', root directory '/a/types'. ========
+Resolving with primary search path '/a/types'.
+File '/a/types/jquery.d.ts' does not exist.
+File '/a/types/jquery/package.json' does not exist.
+File '/a/types/jquery/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/a/types/jquery/index.d.ts', result '/a/types/jquery/index.d.ts'.
+======== Type reference directive 'jquery' was successfully resolved to '/a/types/jquery/index.d.ts', primary: true. ========
diff --git a/testdata/baselines/reference/submodule/conformance/library-reference-2.trace.json b/testdata/baselines/reference/submodule/conformance/library-reference-2.trace.json
new file mode 100644
index 0000000000..0f38836cae
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/library-reference-2.trace.json
@@ -0,0 +1,9 @@
+======== Resolving type reference directive 'jquery', containing file '/consumer.ts', root directory '/test/node_modules/@types,/node_modules/@types'. ========
+Resolving with primary search path '/test/node_modules/@types, /node_modules/@types'.
+Directory '/test/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Looking up in 'node_modules' folder, initial location '/'.
+Searching all ancestor node_modules directories for preferred extensions: Declaration.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+======== Type reference directive 'jquery' was not resolved. ========
diff --git a/testdata/baselines/reference/submodule/conformance/library-reference-3.trace.json b/testdata/baselines/reference/submodule/conformance/library-reference-3.trace.json
new file mode 100644
index 0000000000..deaa485e43
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/library-reference-3.trace.json
@@ -0,0 +1,11 @@
+======== Resolving type reference directive 'jquery', containing file '/src/consumer.ts', root directory '/src/node_modules/@types,/node_modules/@types'. ========
+Resolving with primary search path '/src/node_modules/@types, /node_modules/@types'.
+Directory '/src/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Looking up in 'node_modules' folder, initial location '/src'.
+Searching all ancestor node_modules directories for preferred extensions: Declaration.
+File '/src/node_modules/jquery/package.json' does not exist.
+File '/src/node_modules/jquery.d.ts' does not exist.
+File '/src/node_modules/jquery/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/src/node_modules/jquery/index.d.ts', result '/src/node_modules/jquery/index.d.ts'.
+======== Type reference directive 'jquery' was successfully resolved to '/src/node_modules/jquery/index.d.ts', primary: false. ========
diff --git a/testdata/baselines/reference/submodule/conformance/library-reference-4.trace.json b/testdata/baselines/reference/submodule/conformance/library-reference-4.trace.json
new file mode 100644
index 0000000000..084081bfd1
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/library-reference-4.trace.json
@@ -0,0 +1,52 @@
+======== Resolving type reference directive 'foo', containing file '/src/root.ts', root directory '/.src/test/node_modules/@types,/.src/node_modules/@types,/node_modules/@types'. ========
+Resolving with primary search path '/.src/test/node_modules/@types, /.src/node_modules/@types, /node_modules/@types'.
+Directory '/.src/test/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/.src/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Looking up in 'node_modules' folder, initial location '/src'.
+Searching all ancestor node_modules directories for preferred extensions: Declaration.
+Directory '/src/node_modules' does not exist, skipping all lookups in it.
+Directory '/src/node_modules/@types' does not exist, skipping all lookups in it.
+File '/node_modules/foo/package.json' does not exist.
+File '/node_modules/foo.d.ts' does not exist.
+File '/node_modules/foo/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/foo/index.d.ts', result '/node_modules/foo/index.d.ts'.
+======== Type reference directive 'foo' was successfully resolved to '/node_modules/foo/index.d.ts', primary: false. ========
+======== Resolving type reference directive 'bar', containing file '/src/root.ts', root directory '/.src/test/node_modules/@types,/.src/node_modules/@types,/node_modules/@types'. ========
+Resolving with primary search path '/.src/test/node_modules/@types, /.src/node_modules/@types, /node_modules/@types'.
+Directory '/.src/test/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/.src/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Looking up in 'node_modules' folder, initial location '/src'.
+Searching all ancestor node_modules directories for preferred extensions: Declaration.
+Directory '/src/node_modules' does not exist, skipping all lookups in it.
+Directory '/src/node_modules/@types' does not exist, skipping all lookups in it.
+File '/node_modules/bar/package.json' does not exist.
+File '/node_modules/bar.d.ts' does not exist.
+File '/node_modules/bar/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/bar/index.d.ts', result '/node_modules/bar/index.d.ts'.
+======== Type reference directive 'bar' was successfully resolved to '/node_modules/bar/index.d.ts', primary: false. ========
+======== Resolving type reference directive 'alpha', containing file '/node_modules/foo/index.d.ts', root directory '/.src/test/node_modules/@types,/.src/node_modules/@types,/node_modules/@types'. ========
+Resolving with primary search path '/.src/test/node_modules/@types, /.src/node_modules/@types, /node_modules/@types'.
+Directory '/.src/test/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/.src/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Looking up in 'node_modules' folder, initial location '/node_modules/foo'.
+Searching all ancestor node_modules directories for preferred extensions: Declaration.
+File '/node_modules/foo/node_modules/alpha/package.json' does not exist.
+File '/node_modules/foo/node_modules/alpha.d.ts' does not exist.
+File '/node_modules/foo/node_modules/alpha/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/foo/node_modules/alpha/index.d.ts', result '/node_modules/foo/node_modules/alpha/index.d.ts'.
+======== Type reference directive 'alpha' was successfully resolved to '/node_modules/foo/node_modules/alpha/index.d.ts', primary: false. ========
+======== Resolving type reference directive 'alpha', containing file '/node_modules/bar/index.d.ts', root directory '/.src/test/node_modules/@types,/.src/node_modules/@types,/node_modules/@types'. ========
+Resolving with primary search path '/.src/test/node_modules/@types, /.src/node_modules/@types, /node_modules/@types'.
+Directory '/.src/test/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/.src/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Looking up in 'node_modules' folder, initial location '/node_modules/bar'.
+Searching all ancestor node_modules directories for preferred extensions: Declaration.
+File '/node_modules/bar/node_modules/alpha/package.json' does not exist.
+File '/node_modules/bar/node_modules/alpha.d.ts' does not exist.
+File '/node_modules/bar/node_modules/alpha/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/bar/node_modules/alpha/index.d.ts', result '/node_modules/bar/node_modules/alpha/index.d.ts'.
+======== Type reference directive 'alpha' was successfully resolved to '/node_modules/bar/node_modules/alpha/index.d.ts', primary: false. ========
diff --git a/testdata/baselines/reference/submodule/conformance/library-reference-5.trace.json b/testdata/baselines/reference/submodule/conformance/library-reference-5.trace.json
new file mode 100644
index 0000000000..77d8a02569
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/library-reference-5.trace.json
@@ -0,0 +1,44 @@
+======== Resolving type reference directive 'foo', containing file '/src/root.ts', root directory '/node_modules/@types'. ========
+Resolving with primary search path '/node_modules/@types'.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Looking up in 'node_modules' folder, initial location '/src'.
+Searching all ancestor node_modules directories for preferred extensions: Declaration.
+Directory '/src/node_modules' does not exist, skipping all lookups in it.
+Directory '/src/node_modules/@types' does not exist, skipping all lookups in it.
+File '/node_modules/foo/package.json' does not exist.
+File '/node_modules/foo.d.ts' does not exist.
+File '/node_modules/foo/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/foo/index.d.ts', result '/node_modules/foo/index.d.ts'.
+======== Type reference directive 'foo' was successfully resolved to '/node_modules/foo/index.d.ts', primary: false. ========
+======== Resolving type reference directive 'bar', containing file '/src/root.ts', root directory '/node_modules/@types'. ========
+Resolving with primary search path '/node_modules/@types'.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Looking up in 'node_modules' folder, initial location '/src'.
+Searching all ancestor node_modules directories for preferred extensions: Declaration.
+Directory '/src/node_modules' does not exist, skipping all lookups in it.
+Directory '/src/node_modules/@types' does not exist, skipping all lookups in it.
+File '/node_modules/bar/package.json' does not exist.
+File '/node_modules/bar.d.ts' does not exist.
+File '/node_modules/bar/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/bar/index.d.ts', result '/node_modules/bar/index.d.ts'.
+======== Type reference directive 'bar' was successfully resolved to '/node_modules/bar/index.d.ts', primary: false. ========
+======== Resolving type reference directive 'alpha', containing file '/node_modules/foo/index.d.ts', root directory '/node_modules/@types'. ========
+Resolving with primary search path '/node_modules/@types'.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Looking up in 'node_modules' folder, initial location '/node_modules/foo'.
+Searching all ancestor node_modules directories for preferred extensions: Declaration.
+File '/node_modules/foo/node_modules/alpha/package.json' does not exist.
+File '/node_modules/foo/node_modules/alpha.d.ts' does not exist.
+File '/node_modules/foo/node_modules/alpha/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/foo/node_modules/alpha/index.d.ts', result '/node_modules/foo/node_modules/alpha/index.d.ts'.
+======== Type reference directive 'alpha' was successfully resolved to '/node_modules/foo/node_modules/alpha/index.d.ts', primary: false. ========
+======== Resolving type reference directive 'alpha', containing file '/node_modules/bar/index.d.ts', root directory '/node_modules/@types'. ========
+Resolving with primary search path '/node_modules/@types'.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Looking up in 'node_modules' folder, initial location '/node_modules/bar'.
+Searching all ancestor node_modules directories for preferred extensions: Declaration.
+File '/node_modules/bar/node_modules/alpha/package.json' does not exist.
+File '/node_modules/bar/node_modules/alpha.d.ts' does not exist.
+File '/node_modules/bar/node_modules/alpha/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/bar/node_modules/alpha/index.d.ts', result '/node_modules/bar/node_modules/alpha/index.d.ts'.
+======== Type reference directive 'alpha' was successfully resolved to '/node_modules/bar/node_modules/alpha/index.d.ts', primary: false. ========
diff --git a/testdata/baselines/reference/submodule/conformance/library-reference-6.trace.json b/testdata/baselines/reference/submodule/conformance/library-reference-6.trace.json
new file mode 100644
index 0000000000..422db93453
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/library-reference-6.trace.json
@@ -0,0 +1,12 @@
+======== Resolving type reference directive 'alpha', containing file '/src/foo.ts', root directory '/node_modules/@types'. ========
+Resolving with primary search path '/node_modules/@types'.
+File '/node_modules/@types/alpha/package.json' does not exist according to earlier cached lookups.
+File '/node_modules/@types/alpha/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/@types/alpha/index.d.ts', result '/node_modules/@types/alpha/index.d.ts'.
+======== Type reference directive 'alpha' was successfully resolved to '/node_modules/@types/alpha/index.d.ts', primary: true. ========
+======== Resolving type reference directive 'alpha', containing file '/__inferred type names__.ts', root directory '/node_modules/@types'. ========
+Resolving with primary search path '/node_modules/@types'.
+File '/node_modules/@types/alpha/package.json' does not exist.
+File '/node_modules/@types/alpha/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/@types/alpha/index.d.ts', result '/node_modules/@types/alpha/index.d.ts'.
+======== Type reference directive 'alpha' was successfully resolved to '/node_modules/@types/alpha/index.d.ts', primary: true. ========
diff --git a/testdata/baselines/reference/submodule/conformance/library-reference-7.trace.json b/testdata/baselines/reference/submodule/conformance/library-reference-7.trace.json
new file mode 100644
index 0000000000..a213a97694
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/library-reference-7.trace.json
@@ -0,0 +1,10 @@
+======== Resolving type reference directive 'jquery', containing file '/src/consumer.ts', root directory '/node_modules/@types'. ========
+Resolving with primary search path '/node_modules/@types'.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Looking up in 'node_modules' folder, initial location '/src'.
+Searching all ancestor node_modules directories for preferred extensions: Declaration.
+File '/src/node_modules/jquery/package.json' does not exist.
+File '/src/node_modules/jquery.d.ts' does not exist.
+File '/src/node_modules/jquery/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/src/node_modules/jquery/index.d.ts', result '/src/node_modules/jquery/index.d.ts'.
+======== Type reference directive 'jquery' was successfully resolved to '/src/node_modules/jquery/index.d.ts', primary: false. ========
diff --git a/testdata/baselines/reference/submodule/conformance/library-reference-8.trace.json b/testdata/baselines/reference/submodule/conformance/library-reference-8.trace.json
new file mode 100644
index 0000000000..b27bc84028
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/library-reference-8.trace.json
@@ -0,0 +1,22 @@
+======== Resolving type reference directive 'alpha', containing file '/test/foo.ts', root directory '/test/node_modules/@types,/node_modules/@types'. ========
+Resolving with primary search path '/test/node_modules/@types, /node_modules/@types'.
+Directory '/test/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Looking up in 'node_modules' folder, initial location '/test'.
+Searching all ancestor node_modules directories for preferred extensions: Declaration.
+Directory '/test/node_modules' does not exist, skipping all lookups in it.
+Directory '/test/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+======== Type reference directive 'alpha' was not resolved. ========
+======== Resolving type reference directive 'beta', containing file '/test/foo.ts', root directory '/test/node_modules/@types,/node_modules/@types'. ========
+Resolving with primary search path '/test/node_modules/@types, /node_modules/@types'.
+Directory '/test/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Looking up in 'node_modules' folder, initial location '/test'.
+Searching all ancestor node_modules directories for preferred extensions: Declaration.
+Directory '/test/node_modules' does not exist, skipping all lookups in it.
+Directory '/test/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+======== Type reference directive 'beta' was not resolved. ========
diff --git a/testdata/baselines/reference/submodule/conformance/library-reference-scoped-packages.trace.json b/testdata/baselines/reference/submodule/conformance/library-reference-scoped-packages.trace.json
new file mode 100644
index 0000000000..5c8b96b752
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/library-reference-scoped-packages.trace.json
@@ -0,0 +1,16 @@
+======== Resolving type reference directive '@beep/boop', containing file '/a.ts', root directory '/.src/node_modules/@types,/node_modules/@types'. ========
+Resolving with primary search path '/.src/node_modules/@types, /node_modules/@types'.
+Scoped package detected, looking in 'beep__boop'
+Directory '/.src/node_modules/@types' does not exist, skipping all lookups in it.
+Scoped package detected, looking in 'beep__boop'
+File '/node_modules/@types/beep__boop/package.json' does not exist according to earlier cached lookups.
+File '/node_modules/@types/beep__boop/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/@types/beep__boop/index.d.ts', result '/node_modules/@types/beep__boop/index.d.ts'.
+======== Type reference directive '@beep/boop' was successfully resolved to '/node_modules/@types/beep__boop/index.d.ts', primary: true. ========
+======== Resolving type reference directive 'beep__boop', containing file '/.src/__inferred type names__.ts', root directory '/.src/node_modules/@types,/node_modules/@types'. ========
+Resolving with primary search path '/.src/node_modules/@types, /node_modules/@types'.
+Directory '/.src/node_modules/@types' does not exist, skipping all lookups in it.
+File '/node_modules/@types/beep__boop/package.json' does not exist.
+File '/node_modules/@types/beep__boop/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/@types/beep__boop/index.d.ts', result '/node_modules/@types/beep__boop/index.d.ts'.
+======== Type reference directive 'beep__boop' was successfully resolved to '/node_modules/@types/beep__boop/index.d.ts', primary: true. ========
diff --git a/testdata/baselines/reference/submodule/conformance/moduleResolutionWithExtensions.trace.json b/testdata/baselines/reference/submodule/conformance/moduleResolutionWithExtensions.trace.json
new file mode 100644
index 0000000000..c91bfb320e
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/moduleResolutionWithExtensions.trace.json
@@ -0,0 +1,22 @@
+======== Resolving module './a' from '/src/b.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+Loading module as file / folder, candidate module location '/src/a', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/src/a.ts' exists - use it as a name resolution result.
+======== Module name './a' was successfully resolved to '/src/a.ts'. ========
+======== Resolving module './a.js' from '/src/d.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+Loading module as file / folder, candidate module location '/src/a.js', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/src/a.js' has a '.js' extension - stripping it.
+File '/src/a.ts' exists - use it as a name resolution result.
+======== Module name './a.js' was successfully resolved to '/src/a.ts'. ========
+======== Resolving module './jquery.js' from '/src/jquery_user_1.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+Loading module as file / folder, candidate module location '/src/jquery.js', target file types: TypeScript, JavaScript, Declaration, JSON.
+File name '/src/jquery.js' has a '.js' extension - stripping it.
+File '/src/jquery.ts' does not exist.
+File '/src/jquery.tsx' does not exist.
+File '/src/jquery.d.ts' exists - use it as a name resolution result.
+======== Module name './jquery.js' was successfully resolved to '/src/jquery.d.ts'. ========
diff --git a/testdata/baselines/reference/submodule/conformance/nestedPackageJsonRedirect(moduleresolution=bundler).trace.json b/testdata/baselines/reference/submodule/conformance/nestedPackageJsonRedirect(moduleresolution=bundler).trace.json
new file mode 100644
index 0000000000..5393d839b3
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/nestedPackageJsonRedirect(moduleresolution=bundler).trace.json
@@ -0,0 +1,17 @@
+======== Resolving module '@restart/hooks/useMergedRefs' from '/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/package.json' does not exist.
+Loading module '@restart/hooks/useMergedRefs' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Found 'package.json' at '/node_modules/@restart/hooks/useMergedRefs/package.json'.
+Found 'package.json' at '/node_modules/@restart/hooks/package.json'.
+File '/node_modules/@restart/hooks/useMergedRefs.ts' does not exist.
+File '/node_modules/@restart/hooks/useMergedRefs.tsx' does not exist.
+File '/node_modules/@restart/hooks/useMergedRefs.d.ts' does not exist.
+'package.json' does not have a 'typesVersions' field.
+'package.json' does not have a 'typings' field.
+'package.json' has 'types' field '../esm/useMergedRefs.d.ts' that references '/node_modules/@restart/hooks/esm/useMergedRefs.d.ts'.
+File '/node_modules/@restart/hooks/esm/useMergedRefs.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/@restart/hooks/esm/useMergedRefs.d.ts', result '/node_modules/@restart/hooks/esm/useMergedRefs.d.ts'.
+======== Module name '@restart/hooks/useMergedRefs' was successfully resolved to '/node_modules/@restart/hooks/esm/useMergedRefs.d.ts'. ========
diff --git a/testdata/baselines/reference/submodule/conformance/nestedPackageJsonRedirect(moduleresolution=node16).trace.json b/testdata/baselines/reference/submodule/conformance/nestedPackageJsonRedirect(moduleresolution=node16).trace.json
new file mode 100644
index 0000000000..a6aac5151e
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/nestedPackageJsonRedirect(moduleresolution=node16).trace.json
@@ -0,0 +1,17 @@
+======== Resolving module '@restart/hooks/useMergedRefs' from '/main.ts'. ========
+Explicitly specified module resolution kind: 'Node16'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module '@restart/hooks/useMergedRefs' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Found 'package.json' at '/node_modules/@restart/hooks/useMergedRefs/package.json'.
+Found 'package.json' at '/node_modules/@restart/hooks/package.json'.
+File '/node_modules/@restart/hooks/useMergedRefs.ts' does not exist.
+File '/node_modules/@restart/hooks/useMergedRefs.tsx' does not exist.
+File '/node_modules/@restart/hooks/useMergedRefs.d.ts' does not exist.
+'package.json' does not have a 'typesVersions' field.
+'package.json' does not have a 'typings' field.
+'package.json' has 'types' field '../esm/useMergedRefs.d.ts' that references '/node_modules/@restart/hooks/esm/useMergedRefs.d.ts'.
+File '/node_modules/@restart/hooks/esm/useMergedRefs.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/@restart/hooks/esm/useMergedRefs.d.ts', result '/node_modules/@restart/hooks/esm/useMergedRefs.d.ts'.
+======== Module name '@restart/hooks/useMergedRefs' was successfully resolved to '/node_modules/@restart/hooks/esm/useMergedRefs.d.ts'. ========
diff --git a/testdata/baselines/reference/submodule/conformance/nestedPackageJsonRedirect(moduleresolution=nodenext).trace.json b/testdata/baselines/reference/submodule/conformance/nestedPackageJsonRedirect(moduleresolution=nodenext).trace.json
new file mode 100644
index 0000000000..f85fe49da0
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/nestedPackageJsonRedirect(moduleresolution=nodenext).trace.json
@@ -0,0 +1,17 @@
+======== Resolving module '@restart/hooks/useMergedRefs' from '/main.ts'. ========
+Explicitly specified module resolution kind: 'NodeNext'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module '@restart/hooks/useMergedRefs' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Found 'package.json' at '/node_modules/@restart/hooks/useMergedRefs/package.json'.
+Found 'package.json' at '/node_modules/@restart/hooks/package.json'.
+File '/node_modules/@restart/hooks/useMergedRefs.ts' does not exist.
+File '/node_modules/@restart/hooks/useMergedRefs.tsx' does not exist.
+File '/node_modules/@restart/hooks/useMergedRefs.d.ts' does not exist.
+'package.json' does not have a 'typesVersions' field.
+'package.json' does not have a 'typings' field.
+'package.json' has 'types' field '../esm/useMergedRefs.d.ts' that references '/node_modules/@restart/hooks/esm/useMergedRefs.d.ts'.
+File '/node_modules/@restart/hooks/esm/useMergedRefs.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/@restart/hooks/esm/useMergedRefs.d.ts', result '/node_modules/@restart/hooks/esm/useMergedRefs.d.ts'.
+======== Module name '@restart/hooks/useMergedRefs' was successfully resolved to '/node_modules/@restart/hooks/esm/useMergedRefs.d.ts'. ========
diff --git a/testdata/baselines/reference/submodule/conformance/node10AlternateResult_noResolution.trace.json b/testdata/baselines/reference/submodule/conformance/node10AlternateResult_noResolution.trace.json
new file mode 100644
index 0000000000..fd231b2be0
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/node10AlternateResult_noResolution.trace.json
@@ -0,0 +1,15 @@
+======== Resolving module 'pkg' from '/index.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/package.json' does not exist.
+Loading module 'pkg' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Found 'package.json' at '/node_modules/pkg/package.json'.
+Using 'exports' subpath '.' with target './definitely-not-index.js'.
+File name '/node_modules/pkg/definitely-not-index.js' has a '.js' extension - stripping it.
+File '/node_modules/pkg/definitely-not-index.ts' does not exist.
+File '/node_modules/pkg/definitely-not-index.tsx' does not exist.
+File '/node_modules/pkg/definitely-not-index.d.ts' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolving real path for '/node_modules/pkg/definitely-not-index.d.ts', result '/node_modules/pkg/definitely-not-index.d.ts'.
+======== Module name 'pkg' was successfully resolved to '/node_modules/pkg/definitely-not-index.d.ts' with Package ID 'pkg@1.0.0'. ========
diff --git a/testdata/baselines/reference/submodule/conformance/node10Alternateresult_noTypes.trace.json b/testdata/baselines/reference/submodule/conformance/node10Alternateresult_noTypes.trace.json
new file mode 100644
index 0000000000..fd231b2be0
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/node10Alternateresult_noTypes.trace.json
@@ -0,0 +1,15 @@
+======== Resolving module 'pkg' from '/index.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/package.json' does not exist.
+Loading module 'pkg' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Found 'package.json' at '/node_modules/pkg/package.json'.
+Using 'exports' subpath '.' with target './definitely-not-index.js'.
+File name '/node_modules/pkg/definitely-not-index.js' has a '.js' extension - stripping it.
+File '/node_modules/pkg/definitely-not-index.ts' does not exist.
+File '/node_modules/pkg/definitely-not-index.tsx' does not exist.
+File '/node_modules/pkg/definitely-not-index.d.ts' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolving real path for '/node_modules/pkg/definitely-not-index.d.ts', result '/node_modules/pkg/definitely-not-index.d.ts'.
+======== Module name 'pkg' was successfully resolved to '/node_modules/pkg/definitely-not-index.d.ts' with Package ID 'pkg@1.0.0'. ========
diff --git a/testdata/baselines/reference/submodule/conformance/node10IsNode_node.trace.json b/testdata/baselines/reference/submodule/conformance/node10IsNode_node.trace.json
new file mode 100644
index 0000000000..e62dd092f1
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/node10IsNode_node.trace.json
@@ -0,0 +1,15 @@
+======== Resolving module 'fancy-lib' from '/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/package.json' does not exist.
+Loading module 'fancy-lib' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Found 'package.json' at '/node_modules/fancy-lib/package.json'.
+Using 'exports' subpath '.' with target './definitely-not-index.js'.
+File name '/node_modules/fancy-lib/definitely-not-index.js' has a '.js' extension - stripping it.
+File '/node_modules/fancy-lib/definitely-not-index.ts' does not exist.
+File '/node_modules/fancy-lib/definitely-not-index.tsx' does not exist.
+File '/node_modules/fancy-lib/definitely-not-index.d.ts' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolving real path for '/node_modules/fancy-lib/definitely-not-index.d.ts', result '/node_modules/fancy-lib/definitely-not-index.d.ts'.
+======== Module name 'fancy-lib' was successfully resolved to '/node_modules/fancy-lib/definitely-not-index.d.ts' with Package ID 'fancy-lib@1.0.0'. ========
diff --git a/testdata/baselines/reference/submodule/conformance/node10IsNode_node10.trace.json b/testdata/baselines/reference/submodule/conformance/node10IsNode_node10.trace.json
new file mode 100644
index 0000000000..e62dd092f1
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/node10IsNode_node10.trace.json
@@ -0,0 +1,15 @@
+======== Resolving module 'fancy-lib' from '/main.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/package.json' does not exist.
+Loading module 'fancy-lib' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Found 'package.json' at '/node_modules/fancy-lib/package.json'.
+Using 'exports' subpath '.' with target './definitely-not-index.js'.
+File name '/node_modules/fancy-lib/definitely-not-index.js' has a '.js' extension - stripping it.
+File '/node_modules/fancy-lib/definitely-not-index.ts' does not exist.
+File '/node_modules/fancy-lib/definitely-not-index.tsx' does not exist.
+File '/node_modules/fancy-lib/definitely-not-index.d.ts' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolving real path for '/node_modules/fancy-lib/definitely-not-index.d.ts', result '/node_modules/fancy-lib/definitely-not-index.d.ts'.
+======== Module name 'fancy-lib' was successfully resolved to '/node_modules/fancy-lib/definitely-not-index.d.ts' with Package ID 'fancy-lib@1.0.0'. ========
diff --git a/testdata/baselines/reference/submodule/conformance/nodeModulesAtTypesPriority.trace.json b/testdata/baselines/reference/submodule/conformance/nodeModulesAtTypesPriority.trace.json
new file mode 100644
index 0000000000..98969b7f08
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/nodeModulesAtTypesPriority.trace.json
@@ -0,0 +1,57 @@
+======== Resolving module 'react' from '/packages/a/index.ts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+File '/packages/a/package.json' does not exist according to earlier cached lookups.
+File '/packages/package.json' does not exist according to earlier cached lookups.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'react' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/packages/a/node_modules/react/package.json' does not exist.
+File '/packages/a/node_modules/react.ts' does not exist.
+File '/packages/a/node_modules/react.tsx' does not exist.
+File '/packages/a/node_modules/react.d.ts' does not exist.
+File '/packages/a/node_modules/react/index.ts' does not exist.
+File '/packages/a/node_modules/react/index.tsx' does not exist.
+File '/packages/a/node_modules/react/index.d.ts' does not exist.
+Directory '/packages/a/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/packages/node_modules' does not exist, skipping all lookups in it.
+Directory '/packages/node_modules/@types' does not exist, skipping all lookups in it.
+File '/node_modules/react.ts' does not exist.
+File '/node_modules/react.tsx' does not exist.
+File '/node_modules/react.d.ts' does not exist.
+File '/node_modules/@types/react/package.json' does not exist according to earlier cached lookups.
+File '/node_modules/@types/react.d.ts' does not exist.
+File '/node_modules/@types/react/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/@types/react/index.d.ts', result '/node_modules/@types/react/index.d.ts'.
+======== Module name 'react' was successfully resolved to '/node_modules/@types/react/index.d.ts'. ========
+======== Resolving module 'redux' from '/packages/a/index.ts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+File '/packages/a/package.json' does not exist according to earlier cached lookups.
+File '/packages/package.json' does not exist according to earlier cached lookups.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'redux' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/packages/a/node_modules/redux/package.json' does not exist.
+File '/packages/a/node_modules/redux.ts' does not exist.
+File '/packages/a/node_modules/redux.tsx' does not exist.
+File '/packages/a/node_modules/redux.d.ts' does not exist.
+File '/packages/a/node_modules/redux/index.ts' does not exist.
+File '/packages/a/node_modules/redux/index.tsx' does not exist.
+File '/packages/a/node_modules/redux/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/packages/a/node_modules/redux/index.d.ts', result '/packages/a/node_modules/redux/index.d.ts'.
+======== Module name 'redux' was successfully resolved to '/packages/a/node_modules/redux/index.d.ts'. ========
+======== Resolving type reference directive 'react', containing file '/.src/__inferred type names__.ts', root directory '/.src/node_modules/@types,/node_modules/@types'. ========
+Resolving with primary search path '/.src/node_modules/@types, /node_modules/@types'.
+Directory '/.src/node_modules/@types' does not exist, skipping all lookups in it.
+File '/node_modules/@types/react/package.json' does not exist.
+File '/node_modules/@types/react/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/@types/react/index.d.ts', result '/node_modules/@types/react/index.d.ts'.
+======== Type reference directive 'react' was successfully resolved to '/node_modules/@types/react/index.d.ts', primary: true. ========
+======== Resolving type reference directive 'redux', containing file '/.src/__inferred type names__.ts', root directory '/.src/node_modules/@types,/node_modules/@types'. ========
+Resolving with primary search path '/.src/node_modules/@types, /node_modules/@types'.
+Directory '/.src/node_modules/@types' does not exist, skipping all lookups in it.
+File '/node_modules/@types/redux/package.json' does not exist.
+File '/node_modules/@types/redux/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/@types/redux/index.d.ts', result '/node_modules/@types/redux/index.d.ts'.
+======== Type reference directive 'redux' was successfully resolved to '/node_modules/@types/redux/index.d.ts', primary: true. ========
diff --git a/testdata/baselines/reference/submodule/conformance/nodeModulesExportsBlocksTypesVersions(module=node16).trace.json b/testdata/baselines/reference/submodule/conformance/nodeModulesExportsBlocksTypesVersions(module=node16).trace.json
new file mode 100644
index 0000000000..cdf5b6df2d
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/nodeModulesExportsBlocksTypesVersions(module=node16).trace.json
@@ -0,0 +1,210 @@
+======== Resolving module 'exports-and-types-versions/foo' from '/main.cts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'exports-and-types-versions/foo' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/node_modules/exports-and-types-versions/package.json' exists according to earlier cached lookups.
+Using 'exports' subpath './foo' with target './dist/foo.js'.
+File name '/node_modules/exports-and-types-versions/dist/foo.js' has a '.js' extension - stripping it.
+File '/node_modules/exports-and-types-versions/dist/foo.ts' does not exist.
+File '/node_modules/exports-and-types-versions/dist/foo.tsx' does not exist.
+File '/node_modules/exports-and-types-versions/dist/foo.d.ts' does not exist.
+Export specifier './foo' does not exist in package.json scope at path '/node_modules/exports-and-types-versions'.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript.
+File '/node_modules/exports-and-types-versions/package.json' exists according to earlier cached lookups.
+Using 'exports' subpath './foo' with target './dist/foo.js'.
+File name '/node_modules/exports-and-types-versions/dist/foo.js' has a '.js' extension - stripping it.
+File '/node_modules/exports-and-types-versions/dist/foo.js' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolving real path for '/node_modules/exports-and-types-versions/dist/foo.js', result '/node_modules/exports-and-types-versions/dist/foo.js'.
+======== Module name 'exports-and-types-versions/foo' was successfully resolved to '/node_modules/exports-and-types-versions/dist/foo.js' with Package ID 'exports-and-types-versions@1.0.0'. ========
+======== Resolving module 'exports-and-types-versions/nope' from '/main.cts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'exports-and-types-versions/nope' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/node_modules/exports-and-types-versions/package.json' exists according to earlier cached lookups.
+Export specifier './nope' does not exist in package.json scope at path '/node_modules/exports-and-types-versions'.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript.
+File '/node_modules/exports-and-types-versions/package.json' exists according to earlier cached lookups.
+Export specifier './nope' does not exist in package.json scope at path '/node_modules/exports-and-types-versions'.
+======== Module name 'exports-and-types-versions/nope' was not resolved. ========
+======== Resolving module 'exports-and-types-versions/yep' from '/main.cts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'exports-and-types-versions/yep' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/node_modules/exports-and-types-versions/package.json' exists according to earlier cached lookups.
+Entering conditional exports.
+Matched 'exports' condition 'types'.
+Using 'exports' subpath './yep' with target './types/foo.d.ts'.
+File '/node_modules/exports-and-types-versions/types/foo.d.ts' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolved under condition 'types'.
+Exiting conditional exports.
+Resolving real path for '/node_modules/exports-and-types-versions/types/foo.d.ts', result '/node_modules/exports-and-types-versions/types/foo.d.ts'.
+======== Module name 'exports-and-types-versions/yep' was successfully resolved to '/node_modules/exports-and-types-versions/types/foo.d.ts' with Package ID 'exports-and-types-versions@1.0.0'. ========
+======== Resolving module 'exports-and-types-versions/versioned-yep' from '/main.cts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'exports-and-types-versions/versioned-yep' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/node_modules/exports-and-types-versions/package.json' exists according to earlier cached lookups.
+Entering conditional exports.
+Matched 'exports' condition 'types@>=4'.
+Using 'exports' subpath './versioned-yep' with target './types/foo.d.ts'.
+File '/node_modules/exports-and-types-versions/types/foo.d.ts' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolved under condition 'types@>=4'.
+Exiting conditional exports.
+Resolving real path for '/node_modules/exports-and-types-versions/types/foo.d.ts', result '/node_modules/exports-and-types-versions/types/foo.d.ts'.
+======== Module name 'exports-and-types-versions/versioned-yep' was successfully resolved to '/node_modules/exports-and-types-versions/types/foo.d.ts' with Package ID 'exports-and-types-versions@1.0.0'. ========
+======== Resolving module 'exports-and-types-versions/versioned-nah' from '/main.cts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'exports-and-types-versions/versioned-nah' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/node_modules/exports-and-types-versions/package.json' exists according to earlier cached lookups.
+Entering conditional exports.
+Saw non-matching condition 'types@<4'.
+Exiting conditional exports.
+Export specifier './versioned-nah' does not exist in package.json scope at path '/node_modules/exports-and-types-versions'.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript.
+File '/node_modules/exports-and-types-versions/package.json' exists according to earlier cached lookups.
+Entering conditional exports.
+Saw non-matching condition 'types@<4'.
+Exiting conditional exports.
+Export specifier './versioned-nah' does not exist in package.json scope at path '/node_modules/exports-and-types-versions'.
+======== Module name 'exports-and-types-versions/versioned-nah' was not resolved. ========
+======== Resolving module 'just-types-versions/foo' from '/main.cts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'just-types-versions/foo' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/node_modules/just-types-versions/package.json' exists according to earlier cached lookups.
+'package.json' has a 'typesVersions' entry '*' that matches compiler version '7.0.0-dev', looking for a pattern to match module name 'foo'.
+Module name 'foo', matched pattern 'foo'.
+Trying substitution './types/foo.d.ts', candidate module location: './types/foo.d.ts'.
+File '/node_modules/just-types-versions/types/foo.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/just-types-versions/types/foo.d.ts', result '/node_modules/just-types-versions/types/foo.d.ts'.
+======== Module name 'just-types-versions/foo' was successfully resolved to '/node_modules/just-types-versions/types/foo.d.ts'. ========
+======== Resolving module 'exports-and-types-versions/foo' from '/main.mts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/package.json' does not exist.
+Loading module 'exports-and-types-versions/foo' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Found 'package.json' at '/node_modules/exports-and-types-versions/package.json'.
+Using 'exports' subpath './foo' with target './dist/foo.js'.
+File name '/node_modules/exports-and-types-versions/dist/foo.js' has a '.js' extension - stripping it.
+File '/node_modules/exports-and-types-versions/dist/foo.ts' does not exist.
+File '/node_modules/exports-and-types-versions/dist/foo.tsx' does not exist.
+File '/node_modules/exports-and-types-versions/dist/foo.d.ts' does not exist.
+Export specifier './foo' does not exist in package.json scope at path '/node_modules/exports-and-types-versions'.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript.
+File '/node_modules/exports-and-types-versions/package.json' exists according to earlier cached lookups.
+Using 'exports' subpath './foo' with target './dist/foo.js'.
+File name '/node_modules/exports-and-types-versions/dist/foo.js' has a '.js' extension - stripping it.
+File '/node_modules/exports-and-types-versions/dist/foo.js' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolving real path for '/node_modules/exports-and-types-versions/dist/foo.js', result '/node_modules/exports-and-types-versions/dist/foo.js'.
+Resolution of non-relative name failed; trying with modern Node resolution features disabled to see if npm library needs configuration update.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'exports-and-types-versions/foo' from 'node_modules' folder, target file types: TypeScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/node_modules/exports-and-types-versions/package.json' exists according to earlier cached lookups.
+'package.json' has a 'typesVersions' field with version-specific path mappings.
+'package.json' has a 'typesVersions' entry '*' that matches compiler version '7.0.0-dev', looking for a pattern to match module name 'foo'.
+Module name 'foo', matched pattern 'foo'.
+Trying substitution './types/foo.d.ts', candidate module location: './types/foo.d.ts'.
+File '/node_modules/exports-and-types-versions/types/foo.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/exports-and-types-versions/types/foo.d.ts', result '/node_modules/exports-and-types-versions/types/foo.d.ts'.
+======== Module name 'exports-and-types-versions/foo' was successfully resolved to '/node_modules/exports-and-types-versions/dist/foo.js' with Package ID 'exports-and-types-versions@1.0.0'. ========
+======== Resolving module 'exports-and-types-versions/nope' from '/main.mts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'exports-and-types-versions/nope' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/node_modules/exports-and-types-versions/package.json' exists according to earlier cached lookups.
+Export specifier './nope' does not exist in package.json scope at path '/node_modules/exports-and-types-versions'.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript.
+File '/node_modules/exports-and-types-versions/package.json' exists according to earlier cached lookups.
+Export specifier './nope' does not exist in package.json scope at path '/node_modules/exports-and-types-versions'.
+======== Module name 'exports-and-types-versions/nope' was not resolved. ========
+======== Resolving module 'exports-and-types-versions/yep' from '/main.mts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'exports-and-types-versions/yep' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/node_modules/exports-and-types-versions/package.json' exists according to earlier cached lookups.
+Entering conditional exports.
+Matched 'exports' condition 'types'.
+Using 'exports' subpath './yep' with target './types/foo.d.ts'.
+File '/node_modules/exports-and-types-versions/types/foo.d.ts' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolved under condition 'types'.
+Exiting conditional exports.
+Resolving real path for '/node_modules/exports-and-types-versions/types/foo.d.ts', result '/node_modules/exports-and-types-versions/types/foo.d.ts'.
+======== Module name 'exports-and-types-versions/yep' was successfully resolved to '/node_modules/exports-and-types-versions/types/foo.d.ts' with Package ID 'exports-and-types-versions@1.0.0'. ========
+======== Resolving module 'exports-and-types-versions/versioned-yep' from '/main.mts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'exports-and-types-versions/versioned-yep' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/node_modules/exports-and-types-versions/package.json' exists according to earlier cached lookups.
+Entering conditional exports.
+Matched 'exports' condition 'types@>=4'.
+Using 'exports' subpath './versioned-yep' with target './types/foo.d.ts'.
+File '/node_modules/exports-and-types-versions/types/foo.d.ts' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolved under condition 'types@>=4'.
+Exiting conditional exports.
+Resolving real path for '/node_modules/exports-and-types-versions/types/foo.d.ts', result '/node_modules/exports-and-types-versions/types/foo.d.ts'.
+======== Module name 'exports-and-types-versions/versioned-yep' was successfully resolved to '/node_modules/exports-and-types-versions/types/foo.d.ts' with Package ID 'exports-and-types-versions@1.0.0'. ========
+======== Resolving module 'exports-and-types-versions/versioned-nah' from '/main.mts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'exports-and-types-versions/versioned-nah' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/node_modules/exports-and-types-versions/package.json' exists according to earlier cached lookups.
+Entering conditional exports.
+Saw non-matching condition 'types@<4'.
+Exiting conditional exports.
+Export specifier './versioned-nah' does not exist in package.json scope at path '/node_modules/exports-and-types-versions'.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript.
+File '/node_modules/exports-and-types-versions/package.json' exists according to earlier cached lookups.
+Entering conditional exports.
+Saw non-matching condition 'types@<4'.
+Exiting conditional exports.
+Export specifier './versioned-nah' does not exist in package.json scope at path '/node_modules/exports-and-types-versions'.
+======== Module name 'exports-and-types-versions/versioned-nah' was not resolved. ========
+======== Resolving module 'just-types-versions/foo' from '/main.mts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'just-types-versions/foo' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Found 'package.json' at '/node_modules/just-types-versions/package.json'.
+'package.json' has a 'typesVersions' field with version-specific path mappings.
+'package.json' has a 'typesVersions' entry '*' that matches compiler version '7.0.0-dev', looking for a pattern to match module name 'foo'.
+Module name 'foo', matched pattern 'foo'.
+Trying substitution './types/foo.d.ts', candidate module location: './types/foo.d.ts'.
+File '/node_modules/just-types-versions/types/foo.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/just-types-versions/types/foo.d.ts', result '/node_modules/just-types-versions/types/foo.d.ts'.
+======== Module name 'just-types-versions/foo' was successfully resolved to '/node_modules/just-types-versions/types/foo.d.ts'. ========
diff --git a/testdata/baselines/reference/submodule/conformance/nodeModulesExportsBlocksTypesVersions(module=node18).trace.json b/testdata/baselines/reference/submodule/conformance/nodeModulesExportsBlocksTypesVersions(module=node18).trace.json
new file mode 100644
index 0000000000..cdf5b6df2d
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/nodeModulesExportsBlocksTypesVersions(module=node18).trace.json
@@ -0,0 +1,210 @@
+======== Resolving module 'exports-and-types-versions/foo' from '/main.cts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'exports-and-types-versions/foo' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/node_modules/exports-and-types-versions/package.json' exists according to earlier cached lookups.
+Using 'exports' subpath './foo' with target './dist/foo.js'.
+File name '/node_modules/exports-and-types-versions/dist/foo.js' has a '.js' extension - stripping it.
+File '/node_modules/exports-and-types-versions/dist/foo.ts' does not exist.
+File '/node_modules/exports-and-types-versions/dist/foo.tsx' does not exist.
+File '/node_modules/exports-and-types-versions/dist/foo.d.ts' does not exist.
+Export specifier './foo' does not exist in package.json scope at path '/node_modules/exports-and-types-versions'.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript.
+File '/node_modules/exports-and-types-versions/package.json' exists according to earlier cached lookups.
+Using 'exports' subpath './foo' with target './dist/foo.js'.
+File name '/node_modules/exports-and-types-versions/dist/foo.js' has a '.js' extension - stripping it.
+File '/node_modules/exports-and-types-versions/dist/foo.js' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolving real path for '/node_modules/exports-and-types-versions/dist/foo.js', result '/node_modules/exports-and-types-versions/dist/foo.js'.
+======== Module name 'exports-and-types-versions/foo' was successfully resolved to '/node_modules/exports-and-types-versions/dist/foo.js' with Package ID 'exports-and-types-versions@1.0.0'. ========
+======== Resolving module 'exports-and-types-versions/nope' from '/main.cts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'exports-and-types-versions/nope' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/node_modules/exports-and-types-versions/package.json' exists according to earlier cached lookups.
+Export specifier './nope' does not exist in package.json scope at path '/node_modules/exports-and-types-versions'.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript.
+File '/node_modules/exports-and-types-versions/package.json' exists according to earlier cached lookups.
+Export specifier './nope' does not exist in package.json scope at path '/node_modules/exports-and-types-versions'.
+======== Module name 'exports-and-types-versions/nope' was not resolved. ========
+======== Resolving module 'exports-and-types-versions/yep' from '/main.cts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'exports-and-types-versions/yep' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/node_modules/exports-and-types-versions/package.json' exists according to earlier cached lookups.
+Entering conditional exports.
+Matched 'exports' condition 'types'.
+Using 'exports' subpath './yep' with target './types/foo.d.ts'.
+File '/node_modules/exports-and-types-versions/types/foo.d.ts' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolved under condition 'types'.
+Exiting conditional exports.
+Resolving real path for '/node_modules/exports-and-types-versions/types/foo.d.ts', result '/node_modules/exports-and-types-versions/types/foo.d.ts'.
+======== Module name 'exports-and-types-versions/yep' was successfully resolved to '/node_modules/exports-and-types-versions/types/foo.d.ts' with Package ID 'exports-and-types-versions@1.0.0'. ========
+======== Resolving module 'exports-and-types-versions/versioned-yep' from '/main.cts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'exports-and-types-versions/versioned-yep' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/node_modules/exports-and-types-versions/package.json' exists according to earlier cached lookups.
+Entering conditional exports.
+Matched 'exports' condition 'types@>=4'.
+Using 'exports' subpath './versioned-yep' with target './types/foo.d.ts'.
+File '/node_modules/exports-and-types-versions/types/foo.d.ts' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolved under condition 'types@>=4'.
+Exiting conditional exports.
+Resolving real path for '/node_modules/exports-and-types-versions/types/foo.d.ts', result '/node_modules/exports-and-types-versions/types/foo.d.ts'.
+======== Module name 'exports-and-types-versions/versioned-yep' was successfully resolved to '/node_modules/exports-and-types-versions/types/foo.d.ts' with Package ID 'exports-and-types-versions@1.0.0'. ========
+======== Resolving module 'exports-and-types-versions/versioned-nah' from '/main.cts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'exports-and-types-versions/versioned-nah' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/node_modules/exports-and-types-versions/package.json' exists according to earlier cached lookups.
+Entering conditional exports.
+Saw non-matching condition 'types@<4'.
+Exiting conditional exports.
+Export specifier './versioned-nah' does not exist in package.json scope at path '/node_modules/exports-and-types-versions'.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript.
+File '/node_modules/exports-and-types-versions/package.json' exists according to earlier cached lookups.
+Entering conditional exports.
+Saw non-matching condition 'types@<4'.
+Exiting conditional exports.
+Export specifier './versioned-nah' does not exist in package.json scope at path '/node_modules/exports-and-types-versions'.
+======== Module name 'exports-and-types-versions/versioned-nah' was not resolved. ========
+======== Resolving module 'just-types-versions/foo' from '/main.cts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'just-types-versions/foo' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/node_modules/just-types-versions/package.json' exists according to earlier cached lookups.
+'package.json' has a 'typesVersions' entry '*' that matches compiler version '7.0.0-dev', looking for a pattern to match module name 'foo'.
+Module name 'foo', matched pattern 'foo'.
+Trying substitution './types/foo.d.ts', candidate module location: './types/foo.d.ts'.
+File '/node_modules/just-types-versions/types/foo.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/just-types-versions/types/foo.d.ts', result '/node_modules/just-types-versions/types/foo.d.ts'.
+======== Module name 'just-types-versions/foo' was successfully resolved to '/node_modules/just-types-versions/types/foo.d.ts'. ========
+======== Resolving module 'exports-and-types-versions/foo' from '/main.mts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/package.json' does not exist.
+Loading module 'exports-and-types-versions/foo' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Found 'package.json' at '/node_modules/exports-and-types-versions/package.json'.
+Using 'exports' subpath './foo' with target './dist/foo.js'.
+File name '/node_modules/exports-and-types-versions/dist/foo.js' has a '.js' extension - stripping it.
+File '/node_modules/exports-and-types-versions/dist/foo.ts' does not exist.
+File '/node_modules/exports-and-types-versions/dist/foo.tsx' does not exist.
+File '/node_modules/exports-and-types-versions/dist/foo.d.ts' does not exist.
+Export specifier './foo' does not exist in package.json scope at path '/node_modules/exports-and-types-versions'.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript.
+File '/node_modules/exports-and-types-versions/package.json' exists according to earlier cached lookups.
+Using 'exports' subpath './foo' with target './dist/foo.js'.
+File name '/node_modules/exports-and-types-versions/dist/foo.js' has a '.js' extension - stripping it.
+File '/node_modules/exports-and-types-versions/dist/foo.js' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolving real path for '/node_modules/exports-and-types-versions/dist/foo.js', result '/node_modules/exports-and-types-versions/dist/foo.js'.
+Resolution of non-relative name failed; trying with modern Node resolution features disabled to see if npm library needs configuration update.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'exports-and-types-versions/foo' from 'node_modules' folder, target file types: TypeScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/node_modules/exports-and-types-versions/package.json' exists according to earlier cached lookups.
+'package.json' has a 'typesVersions' field with version-specific path mappings.
+'package.json' has a 'typesVersions' entry '*' that matches compiler version '7.0.0-dev', looking for a pattern to match module name 'foo'.
+Module name 'foo', matched pattern 'foo'.
+Trying substitution './types/foo.d.ts', candidate module location: './types/foo.d.ts'.
+File '/node_modules/exports-and-types-versions/types/foo.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/exports-and-types-versions/types/foo.d.ts', result '/node_modules/exports-and-types-versions/types/foo.d.ts'.
+======== Module name 'exports-and-types-versions/foo' was successfully resolved to '/node_modules/exports-and-types-versions/dist/foo.js' with Package ID 'exports-and-types-versions@1.0.0'. ========
+======== Resolving module 'exports-and-types-versions/nope' from '/main.mts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'exports-and-types-versions/nope' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/node_modules/exports-and-types-versions/package.json' exists according to earlier cached lookups.
+Export specifier './nope' does not exist in package.json scope at path '/node_modules/exports-and-types-versions'.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript.
+File '/node_modules/exports-and-types-versions/package.json' exists according to earlier cached lookups.
+Export specifier './nope' does not exist in package.json scope at path '/node_modules/exports-and-types-versions'.
+======== Module name 'exports-and-types-versions/nope' was not resolved. ========
+======== Resolving module 'exports-and-types-versions/yep' from '/main.mts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'exports-and-types-versions/yep' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/node_modules/exports-and-types-versions/package.json' exists according to earlier cached lookups.
+Entering conditional exports.
+Matched 'exports' condition 'types'.
+Using 'exports' subpath './yep' with target './types/foo.d.ts'.
+File '/node_modules/exports-and-types-versions/types/foo.d.ts' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolved under condition 'types'.
+Exiting conditional exports.
+Resolving real path for '/node_modules/exports-and-types-versions/types/foo.d.ts', result '/node_modules/exports-and-types-versions/types/foo.d.ts'.
+======== Module name 'exports-and-types-versions/yep' was successfully resolved to '/node_modules/exports-and-types-versions/types/foo.d.ts' with Package ID 'exports-and-types-versions@1.0.0'. ========
+======== Resolving module 'exports-and-types-versions/versioned-yep' from '/main.mts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'exports-and-types-versions/versioned-yep' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/node_modules/exports-and-types-versions/package.json' exists according to earlier cached lookups.
+Entering conditional exports.
+Matched 'exports' condition 'types@>=4'.
+Using 'exports' subpath './versioned-yep' with target './types/foo.d.ts'.
+File '/node_modules/exports-and-types-versions/types/foo.d.ts' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolved under condition 'types@>=4'.
+Exiting conditional exports.
+Resolving real path for '/node_modules/exports-and-types-versions/types/foo.d.ts', result '/node_modules/exports-and-types-versions/types/foo.d.ts'.
+======== Module name 'exports-and-types-versions/versioned-yep' was successfully resolved to '/node_modules/exports-and-types-versions/types/foo.d.ts' with Package ID 'exports-and-types-versions@1.0.0'. ========
+======== Resolving module 'exports-and-types-versions/versioned-nah' from '/main.mts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'exports-and-types-versions/versioned-nah' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/node_modules/exports-and-types-versions/package.json' exists according to earlier cached lookups.
+Entering conditional exports.
+Saw non-matching condition 'types@<4'.
+Exiting conditional exports.
+Export specifier './versioned-nah' does not exist in package.json scope at path '/node_modules/exports-and-types-versions'.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript.
+File '/node_modules/exports-and-types-versions/package.json' exists according to earlier cached lookups.
+Entering conditional exports.
+Saw non-matching condition 'types@<4'.
+Exiting conditional exports.
+Export specifier './versioned-nah' does not exist in package.json scope at path '/node_modules/exports-and-types-versions'.
+======== Module name 'exports-and-types-versions/versioned-nah' was not resolved. ========
+======== Resolving module 'just-types-versions/foo' from '/main.mts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'just-types-versions/foo' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Found 'package.json' at '/node_modules/just-types-versions/package.json'.
+'package.json' has a 'typesVersions' field with version-specific path mappings.
+'package.json' has a 'typesVersions' entry '*' that matches compiler version '7.0.0-dev', looking for a pattern to match module name 'foo'.
+Module name 'foo', matched pattern 'foo'.
+Trying substitution './types/foo.d.ts', candidate module location: './types/foo.d.ts'.
+File '/node_modules/just-types-versions/types/foo.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/just-types-versions/types/foo.d.ts', result '/node_modules/just-types-versions/types/foo.d.ts'.
+======== Module name 'just-types-versions/foo' was successfully resolved to '/node_modules/just-types-versions/types/foo.d.ts'. ========
diff --git a/testdata/baselines/reference/submodule/conformance/nodeModulesExportsBlocksTypesVersions(module=nodenext).trace.json b/testdata/baselines/reference/submodule/conformance/nodeModulesExportsBlocksTypesVersions(module=nodenext).trace.json
new file mode 100644
index 0000000000..851e28cb88
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/nodeModulesExportsBlocksTypesVersions(module=nodenext).trace.json
@@ -0,0 +1,210 @@
+======== Resolving module 'exports-and-types-versions/foo' from '/main.cts'. ========
+Module resolution kind is not specified, using 'NodeNext'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'exports-and-types-versions/foo' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/node_modules/exports-and-types-versions/package.json' exists according to earlier cached lookups.
+Using 'exports' subpath './foo' with target './dist/foo.js'.
+File name '/node_modules/exports-and-types-versions/dist/foo.js' has a '.js' extension - stripping it.
+File '/node_modules/exports-and-types-versions/dist/foo.ts' does not exist.
+File '/node_modules/exports-and-types-versions/dist/foo.tsx' does not exist.
+File '/node_modules/exports-and-types-versions/dist/foo.d.ts' does not exist.
+Export specifier './foo' does not exist in package.json scope at path '/node_modules/exports-and-types-versions'.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript.
+File '/node_modules/exports-and-types-versions/package.json' exists according to earlier cached lookups.
+Using 'exports' subpath './foo' with target './dist/foo.js'.
+File name '/node_modules/exports-and-types-versions/dist/foo.js' has a '.js' extension - stripping it.
+File '/node_modules/exports-and-types-versions/dist/foo.js' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolving real path for '/node_modules/exports-and-types-versions/dist/foo.js', result '/node_modules/exports-and-types-versions/dist/foo.js'.
+======== Module name 'exports-and-types-versions/foo' was successfully resolved to '/node_modules/exports-and-types-versions/dist/foo.js' with Package ID 'exports-and-types-versions@1.0.0'. ========
+======== Resolving module 'exports-and-types-versions/nope' from '/main.cts'. ========
+Module resolution kind is not specified, using 'NodeNext'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'exports-and-types-versions/nope' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/node_modules/exports-and-types-versions/package.json' exists according to earlier cached lookups.
+Export specifier './nope' does not exist in package.json scope at path '/node_modules/exports-and-types-versions'.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript.
+File '/node_modules/exports-and-types-versions/package.json' exists according to earlier cached lookups.
+Export specifier './nope' does not exist in package.json scope at path '/node_modules/exports-and-types-versions'.
+======== Module name 'exports-and-types-versions/nope' was not resolved. ========
+======== Resolving module 'exports-and-types-versions/yep' from '/main.cts'. ========
+Module resolution kind is not specified, using 'NodeNext'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'exports-and-types-versions/yep' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/node_modules/exports-and-types-versions/package.json' exists according to earlier cached lookups.
+Entering conditional exports.
+Matched 'exports' condition 'types'.
+Using 'exports' subpath './yep' with target './types/foo.d.ts'.
+File '/node_modules/exports-and-types-versions/types/foo.d.ts' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolved under condition 'types'.
+Exiting conditional exports.
+Resolving real path for '/node_modules/exports-and-types-versions/types/foo.d.ts', result '/node_modules/exports-and-types-versions/types/foo.d.ts'.
+======== Module name 'exports-and-types-versions/yep' was successfully resolved to '/node_modules/exports-and-types-versions/types/foo.d.ts' with Package ID 'exports-and-types-versions@1.0.0'. ========
+======== Resolving module 'exports-and-types-versions/versioned-yep' from '/main.cts'. ========
+Module resolution kind is not specified, using 'NodeNext'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'exports-and-types-versions/versioned-yep' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/node_modules/exports-and-types-versions/package.json' exists according to earlier cached lookups.
+Entering conditional exports.
+Matched 'exports' condition 'types@>=4'.
+Using 'exports' subpath './versioned-yep' with target './types/foo.d.ts'.
+File '/node_modules/exports-and-types-versions/types/foo.d.ts' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolved under condition 'types@>=4'.
+Exiting conditional exports.
+Resolving real path for '/node_modules/exports-and-types-versions/types/foo.d.ts', result '/node_modules/exports-and-types-versions/types/foo.d.ts'.
+======== Module name 'exports-and-types-versions/versioned-yep' was successfully resolved to '/node_modules/exports-and-types-versions/types/foo.d.ts' with Package ID 'exports-and-types-versions@1.0.0'. ========
+======== Resolving module 'exports-and-types-versions/versioned-nah' from '/main.cts'. ========
+Module resolution kind is not specified, using 'NodeNext'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'exports-and-types-versions/versioned-nah' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/node_modules/exports-and-types-versions/package.json' exists according to earlier cached lookups.
+Entering conditional exports.
+Saw non-matching condition 'types@<4'.
+Exiting conditional exports.
+Export specifier './versioned-nah' does not exist in package.json scope at path '/node_modules/exports-and-types-versions'.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript.
+File '/node_modules/exports-and-types-versions/package.json' exists according to earlier cached lookups.
+Entering conditional exports.
+Saw non-matching condition 'types@<4'.
+Exiting conditional exports.
+Export specifier './versioned-nah' does not exist in package.json scope at path '/node_modules/exports-and-types-versions'.
+======== Module name 'exports-and-types-versions/versioned-nah' was not resolved. ========
+======== Resolving module 'just-types-versions/foo' from '/main.cts'. ========
+Module resolution kind is not specified, using 'NodeNext'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'just-types-versions/foo' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/node_modules/just-types-versions/package.json' exists according to earlier cached lookups.
+'package.json' has a 'typesVersions' entry '*' that matches compiler version '7.0.0-dev', looking for a pattern to match module name 'foo'.
+Module name 'foo', matched pattern 'foo'.
+Trying substitution './types/foo.d.ts', candidate module location: './types/foo.d.ts'.
+File '/node_modules/just-types-versions/types/foo.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/just-types-versions/types/foo.d.ts', result '/node_modules/just-types-versions/types/foo.d.ts'.
+======== Module name 'just-types-versions/foo' was successfully resolved to '/node_modules/just-types-versions/types/foo.d.ts'. ========
+======== Resolving module 'exports-and-types-versions/foo' from '/main.mts'. ========
+Module resolution kind is not specified, using 'NodeNext'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/package.json' does not exist.
+Loading module 'exports-and-types-versions/foo' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Found 'package.json' at '/node_modules/exports-and-types-versions/package.json'.
+Using 'exports' subpath './foo' with target './dist/foo.js'.
+File name '/node_modules/exports-and-types-versions/dist/foo.js' has a '.js' extension - stripping it.
+File '/node_modules/exports-and-types-versions/dist/foo.ts' does not exist.
+File '/node_modules/exports-and-types-versions/dist/foo.tsx' does not exist.
+File '/node_modules/exports-and-types-versions/dist/foo.d.ts' does not exist.
+Export specifier './foo' does not exist in package.json scope at path '/node_modules/exports-and-types-versions'.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript.
+File '/node_modules/exports-and-types-versions/package.json' exists according to earlier cached lookups.
+Using 'exports' subpath './foo' with target './dist/foo.js'.
+File name '/node_modules/exports-and-types-versions/dist/foo.js' has a '.js' extension - stripping it.
+File '/node_modules/exports-and-types-versions/dist/foo.js' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolving real path for '/node_modules/exports-and-types-versions/dist/foo.js', result '/node_modules/exports-and-types-versions/dist/foo.js'.
+Resolution of non-relative name failed; trying with modern Node resolution features disabled to see if npm library needs configuration update.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'exports-and-types-versions/foo' from 'node_modules' folder, target file types: TypeScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/node_modules/exports-and-types-versions/package.json' exists according to earlier cached lookups.
+'package.json' has a 'typesVersions' field with version-specific path mappings.
+'package.json' has a 'typesVersions' entry '*' that matches compiler version '7.0.0-dev', looking for a pattern to match module name 'foo'.
+Module name 'foo', matched pattern 'foo'.
+Trying substitution './types/foo.d.ts', candidate module location: './types/foo.d.ts'.
+File '/node_modules/exports-and-types-versions/types/foo.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/exports-and-types-versions/types/foo.d.ts', result '/node_modules/exports-and-types-versions/types/foo.d.ts'.
+======== Module name 'exports-and-types-versions/foo' was successfully resolved to '/node_modules/exports-and-types-versions/dist/foo.js' with Package ID 'exports-and-types-versions@1.0.0'. ========
+======== Resolving module 'exports-and-types-versions/nope' from '/main.mts'. ========
+Module resolution kind is not specified, using 'NodeNext'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'exports-and-types-versions/nope' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/node_modules/exports-and-types-versions/package.json' exists according to earlier cached lookups.
+Export specifier './nope' does not exist in package.json scope at path '/node_modules/exports-and-types-versions'.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript.
+File '/node_modules/exports-and-types-versions/package.json' exists according to earlier cached lookups.
+Export specifier './nope' does not exist in package.json scope at path '/node_modules/exports-and-types-versions'.
+======== Module name 'exports-and-types-versions/nope' was not resolved. ========
+======== Resolving module 'exports-and-types-versions/yep' from '/main.mts'. ========
+Module resolution kind is not specified, using 'NodeNext'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'exports-and-types-versions/yep' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/node_modules/exports-and-types-versions/package.json' exists according to earlier cached lookups.
+Entering conditional exports.
+Matched 'exports' condition 'types'.
+Using 'exports' subpath './yep' with target './types/foo.d.ts'.
+File '/node_modules/exports-and-types-versions/types/foo.d.ts' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolved under condition 'types'.
+Exiting conditional exports.
+Resolving real path for '/node_modules/exports-and-types-versions/types/foo.d.ts', result '/node_modules/exports-and-types-versions/types/foo.d.ts'.
+======== Module name 'exports-and-types-versions/yep' was successfully resolved to '/node_modules/exports-and-types-versions/types/foo.d.ts' with Package ID 'exports-and-types-versions@1.0.0'. ========
+======== Resolving module 'exports-and-types-versions/versioned-yep' from '/main.mts'. ========
+Module resolution kind is not specified, using 'NodeNext'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'exports-and-types-versions/versioned-yep' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/node_modules/exports-and-types-versions/package.json' exists according to earlier cached lookups.
+Entering conditional exports.
+Matched 'exports' condition 'types@>=4'.
+Using 'exports' subpath './versioned-yep' with target './types/foo.d.ts'.
+File '/node_modules/exports-and-types-versions/types/foo.d.ts' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolved under condition 'types@>=4'.
+Exiting conditional exports.
+Resolving real path for '/node_modules/exports-and-types-versions/types/foo.d.ts', result '/node_modules/exports-and-types-versions/types/foo.d.ts'.
+======== Module name 'exports-and-types-versions/versioned-yep' was successfully resolved to '/node_modules/exports-and-types-versions/types/foo.d.ts' with Package ID 'exports-and-types-versions@1.0.0'. ========
+======== Resolving module 'exports-and-types-versions/versioned-nah' from '/main.mts'. ========
+Module resolution kind is not specified, using 'NodeNext'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'exports-and-types-versions/versioned-nah' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/node_modules/exports-and-types-versions/package.json' exists according to earlier cached lookups.
+Entering conditional exports.
+Saw non-matching condition 'types@<4'.
+Exiting conditional exports.
+Export specifier './versioned-nah' does not exist in package.json scope at path '/node_modules/exports-and-types-versions'.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript.
+File '/node_modules/exports-and-types-versions/package.json' exists according to earlier cached lookups.
+Entering conditional exports.
+Saw non-matching condition 'types@<4'.
+Exiting conditional exports.
+Export specifier './versioned-nah' does not exist in package.json scope at path '/node_modules/exports-and-types-versions'.
+======== Module name 'exports-and-types-versions/versioned-nah' was not resolved. ========
+======== Resolving module 'just-types-versions/foo' from '/main.mts'. ========
+Module resolution kind is not specified, using 'NodeNext'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'just-types-versions/foo' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Found 'package.json' at '/node_modules/just-types-versions/package.json'.
+'package.json' has a 'typesVersions' field with version-specific path mappings.
+'package.json' has a 'typesVersions' entry '*' that matches compiler version '7.0.0-dev', looking for a pattern to match module name 'foo'.
+Module name 'foo', matched pattern 'foo'.
+Trying substitution './types/foo.d.ts', candidate module location: './types/foo.d.ts'.
+File '/node_modules/just-types-versions/types/foo.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/just-types-versions/types/foo.d.ts', result '/node_modules/just-types-versions/types/foo.d.ts'.
+======== Module name 'just-types-versions/foo' was successfully resolved to '/node_modules/just-types-versions/types/foo.d.ts'. ========
diff --git a/testdata/baselines/reference/submodule/conformance/nodeModulesPackageImports(module=node16).trace.json b/testdata/baselines/reference/submodule/conformance/nodeModulesPackageImports(module=node16).trace.json
new file mode 100644
index 0000000000..cc02d686fa
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/nodeModulesPackageImports(module=node16).trace.json
@@ -0,0 +1,72 @@
+======== Resolving module '#cjs' from '/.src/index.ts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/.src/package.json' exists according to earlier cached lookups.
+Using 'imports' subpath '#cjs' with target './index.cjs'.
+File name '/.src/index.cjs' has a '.cjs' extension - stripping it.
+File '/.src/index.cts' exists - use it as a name resolution result.
+======== Module name '#cjs' was successfully resolved to '/.src/index.cts'. ========
+======== Resolving module '#mjs' from '/.src/index.ts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/.src/package.json' exists according to earlier cached lookups.
+Using 'imports' subpath '#mjs' with target './index.mjs'.
+File name '/.src/index.mjs' has a '.mjs' extension - stripping it.
+File '/.src/index.mts' exists - use it as a name resolution result.
+======== Module name '#mjs' was successfully resolved to '/.src/index.mts'. ========
+======== Resolving module '#type' from '/.src/index.ts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/.src/package.json' exists according to earlier cached lookups.
+Using 'imports' subpath '#type' with target './index.js'.
+File name '/.src/index.js' has a '.js' extension - stripping it.
+File '/.src/index.ts' exists - use it as a name resolution result.
+======== Module name '#type' was successfully resolved to '/.src/index.ts'. ========
+======== Resolving module '#cjs' from '/.src/index.cts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+Found 'package.json' at '/.src/package.json'.
+Using 'imports' subpath '#cjs' with target './index.cjs'.
+File name '/.src/index.cjs' has a '.cjs' extension - stripping it.
+File '/.src/index.cts' exists - use it as a name resolution result.
+======== Module name '#cjs' was successfully resolved to '/.src/index.cts'. ========
+======== Resolving module '#mjs' from '/.src/index.cts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+File '/.src/package.json' exists according to earlier cached lookups.
+Using 'imports' subpath '#mjs' with target './index.mjs'.
+File name '/.src/index.mjs' has a '.mjs' extension - stripping it.
+File '/.src/index.mts' exists - use it as a name resolution result.
+======== Module name '#mjs' was successfully resolved to '/.src/index.mts'. ========
+======== Resolving module '#type' from '/.src/index.cts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+File '/.src/package.json' exists according to earlier cached lookups.
+Using 'imports' subpath '#type' with target './index.js'.
+File name '/.src/index.js' has a '.js' extension - stripping it.
+File '/.src/index.ts' exists - use it as a name resolution result.
+======== Module name '#type' was successfully resolved to '/.src/index.ts'. ========
+======== Resolving module '#cjs' from '/.src/index.mts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/.src/package.json' exists according to earlier cached lookups.
+Using 'imports' subpath '#cjs' with target './index.cjs'.
+File name '/.src/index.cjs' has a '.cjs' extension - stripping it.
+File '/.src/index.cts' exists - use it as a name resolution result.
+======== Module name '#cjs' was successfully resolved to '/.src/index.cts'. ========
+======== Resolving module '#mjs' from '/.src/index.mts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/.src/package.json' exists according to earlier cached lookups.
+Using 'imports' subpath '#mjs' with target './index.mjs'.
+File name '/.src/index.mjs' has a '.mjs' extension - stripping it.
+File '/.src/index.mts' exists - use it as a name resolution result.
+======== Module name '#mjs' was successfully resolved to '/.src/index.mts'. ========
+======== Resolving module '#type' from '/.src/index.mts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/.src/package.json' exists according to earlier cached lookups.
+Using 'imports' subpath '#type' with target './index.js'.
+File name '/.src/index.js' has a '.js' extension - stripping it.
+File '/.src/index.ts' exists - use it as a name resolution result.
+======== Module name '#type' was successfully resolved to '/.src/index.ts'. ========
diff --git a/testdata/baselines/reference/submodule/conformance/nodeModulesPackageImports(module=node18).trace.json b/testdata/baselines/reference/submodule/conformance/nodeModulesPackageImports(module=node18).trace.json
new file mode 100644
index 0000000000..cc02d686fa
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/nodeModulesPackageImports(module=node18).trace.json
@@ -0,0 +1,72 @@
+======== Resolving module '#cjs' from '/.src/index.ts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/.src/package.json' exists according to earlier cached lookups.
+Using 'imports' subpath '#cjs' with target './index.cjs'.
+File name '/.src/index.cjs' has a '.cjs' extension - stripping it.
+File '/.src/index.cts' exists - use it as a name resolution result.
+======== Module name '#cjs' was successfully resolved to '/.src/index.cts'. ========
+======== Resolving module '#mjs' from '/.src/index.ts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/.src/package.json' exists according to earlier cached lookups.
+Using 'imports' subpath '#mjs' with target './index.mjs'.
+File name '/.src/index.mjs' has a '.mjs' extension - stripping it.
+File '/.src/index.mts' exists - use it as a name resolution result.
+======== Module name '#mjs' was successfully resolved to '/.src/index.mts'. ========
+======== Resolving module '#type' from '/.src/index.ts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/.src/package.json' exists according to earlier cached lookups.
+Using 'imports' subpath '#type' with target './index.js'.
+File name '/.src/index.js' has a '.js' extension - stripping it.
+File '/.src/index.ts' exists - use it as a name resolution result.
+======== Module name '#type' was successfully resolved to '/.src/index.ts'. ========
+======== Resolving module '#cjs' from '/.src/index.cts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+Found 'package.json' at '/.src/package.json'.
+Using 'imports' subpath '#cjs' with target './index.cjs'.
+File name '/.src/index.cjs' has a '.cjs' extension - stripping it.
+File '/.src/index.cts' exists - use it as a name resolution result.
+======== Module name '#cjs' was successfully resolved to '/.src/index.cts'. ========
+======== Resolving module '#mjs' from '/.src/index.cts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+File '/.src/package.json' exists according to earlier cached lookups.
+Using 'imports' subpath '#mjs' with target './index.mjs'.
+File name '/.src/index.mjs' has a '.mjs' extension - stripping it.
+File '/.src/index.mts' exists - use it as a name resolution result.
+======== Module name '#mjs' was successfully resolved to '/.src/index.mts'. ========
+======== Resolving module '#type' from '/.src/index.cts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+File '/.src/package.json' exists according to earlier cached lookups.
+Using 'imports' subpath '#type' with target './index.js'.
+File name '/.src/index.js' has a '.js' extension - stripping it.
+File '/.src/index.ts' exists - use it as a name resolution result.
+======== Module name '#type' was successfully resolved to '/.src/index.ts'. ========
+======== Resolving module '#cjs' from '/.src/index.mts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/.src/package.json' exists according to earlier cached lookups.
+Using 'imports' subpath '#cjs' with target './index.cjs'.
+File name '/.src/index.cjs' has a '.cjs' extension - stripping it.
+File '/.src/index.cts' exists - use it as a name resolution result.
+======== Module name '#cjs' was successfully resolved to '/.src/index.cts'. ========
+======== Resolving module '#mjs' from '/.src/index.mts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/.src/package.json' exists according to earlier cached lookups.
+Using 'imports' subpath '#mjs' with target './index.mjs'.
+File name '/.src/index.mjs' has a '.mjs' extension - stripping it.
+File '/.src/index.mts' exists - use it as a name resolution result.
+======== Module name '#mjs' was successfully resolved to '/.src/index.mts'. ========
+======== Resolving module '#type' from '/.src/index.mts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/.src/package.json' exists according to earlier cached lookups.
+Using 'imports' subpath '#type' with target './index.js'.
+File name '/.src/index.js' has a '.js' extension - stripping it.
+File '/.src/index.ts' exists - use it as a name resolution result.
+======== Module name '#type' was successfully resolved to '/.src/index.ts'. ========
diff --git a/testdata/baselines/reference/submodule/conformance/nodeModulesPackageImports(module=nodenext).trace.json b/testdata/baselines/reference/submodule/conformance/nodeModulesPackageImports(module=nodenext).trace.json
new file mode 100644
index 0000000000..6e070a05d0
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/nodeModulesPackageImports(module=nodenext).trace.json
@@ -0,0 +1,72 @@
+======== Resolving module '#cjs' from '/.src/index.ts'. ========
+Module resolution kind is not specified, using 'NodeNext'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/.src/package.json' exists according to earlier cached lookups.
+Using 'imports' subpath '#cjs' with target './index.cjs'.
+File name '/.src/index.cjs' has a '.cjs' extension - stripping it.
+File '/.src/index.cts' exists - use it as a name resolution result.
+======== Module name '#cjs' was successfully resolved to '/.src/index.cts'. ========
+======== Resolving module '#mjs' from '/.src/index.ts'. ========
+Module resolution kind is not specified, using 'NodeNext'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/.src/package.json' exists according to earlier cached lookups.
+Using 'imports' subpath '#mjs' with target './index.mjs'.
+File name '/.src/index.mjs' has a '.mjs' extension - stripping it.
+File '/.src/index.mts' exists - use it as a name resolution result.
+======== Module name '#mjs' was successfully resolved to '/.src/index.mts'. ========
+======== Resolving module '#type' from '/.src/index.ts'. ========
+Module resolution kind is not specified, using 'NodeNext'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/.src/package.json' exists according to earlier cached lookups.
+Using 'imports' subpath '#type' with target './index.js'.
+File name '/.src/index.js' has a '.js' extension - stripping it.
+File '/.src/index.ts' exists - use it as a name resolution result.
+======== Module name '#type' was successfully resolved to '/.src/index.ts'. ========
+======== Resolving module '#cjs' from '/.src/index.cts'. ========
+Module resolution kind is not specified, using 'NodeNext'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+Found 'package.json' at '/.src/package.json'.
+Using 'imports' subpath '#cjs' with target './index.cjs'.
+File name '/.src/index.cjs' has a '.cjs' extension - stripping it.
+File '/.src/index.cts' exists - use it as a name resolution result.
+======== Module name '#cjs' was successfully resolved to '/.src/index.cts'. ========
+======== Resolving module '#mjs' from '/.src/index.cts'. ========
+Module resolution kind is not specified, using 'NodeNext'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+File '/.src/package.json' exists according to earlier cached lookups.
+Using 'imports' subpath '#mjs' with target './index.mjs'.
+File name '/.src/index.mjs' has a '.mjs' extension - stripping it.
+File '/.src/index.mts' exists - use it as a name resolution result.
+======== Module name '#mjs' was successfully resolved to '/.src/index.mts'. ========
+======== Resolving module '#type' from '/.src/index.cts'. ========
+Module resolution kind is not specified, using 'NodeNext'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+File '/.src/package.json' exists according to earlier cached lookups.
+Using 'imports' subpath '#type' with target './index.js'.
+File name '/.src/index.js' has a '.js' extension - stripping it.
+File '/.src/index.ts' exists - use it as a name resolution result.
+======== Module name '#type' was successfully resolved to '/.src/index.ts'. ========
+======== Resolving module '#cjs' from '/.src/index.mts'. ========
+Module resolution kind is not specified, using 'NodeNext'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/.src/package.json' exists according to earlier cached lookups.
+Using 'imports' subpath '#cjs' with target './index.cjs'.
+File name '/.src/index.cjs' has a '.cjs' extension - stripping it.
+File '/.src/index.cts' exists - use it as a name resolution result.
+======== Module name '#cjs' was successfully resolved to '/.src/index.cts'. ========
+======== Resolving module '#mjs' from '/.src/index.mts'. ========
+Module resolution kind is not specified, using 'NodeNext'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/.src/package.json' exists according to earlier cached lookups.
+Using 'imports' subpath '#mjs' with target './index.mjs'.
+File name '/.src/index.mjs' has a '.mjs' extension - stripping it.
+File '/.src/index.mts' exists - use it as a name resolution result.
+======== Module name '#mjs' was successfully resolved to '/.src/index.mts'. ========
+======== Resolving module '#type' from '/.src/index.mts'. ========
+Module resolution kind is not specified, using 'NodeNext'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/.src/package.json' exists according to earlier cached lookups.
+Using 'imports' subpath '#type' with target './index.js'.
+File name '/.src/index.js' has a '.js' extension - stripping it.
+File '/.src/index.ts' exists - use it as a name resolution result.
+======== Module name '#type' was successfully resolved to '/.src/index.ts'. ========
diff --git a/testdata/baselines/reference/submodule/conformance/nodeModulesPackagePatternExportsTrailers(module=node16).trace.json b/testdata/baselines/reference/submodule/conformance/nodeModulesPackagePatternExportsTrailers(module=node16).trace.json
new file mode 100644
index 0000000000..4ee363b110
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/nodeModulesPackagePatternExportsTrailers(module=node16).trace.json
@@ -0,0 +1,213 @@
+======== Resolving module 'inner/cjs/index.cjs' from '/.src/index.ts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/.src/package.json' exists according to earlier cached lookups.
+Loading module 'inner/cjs/index.cjs' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/.src/node_modules/inner/package.json' exists according to earlier cached lookups.
+Using 'exports' subpath './cjs/*.cjs' with target './index.cjs'.
+File name '/.src/node_modules/inner/index.cjs' has a '.cjs' extension - stripping it.
+File '/.src/node_modules/inner/index.cts' does not exist.
+File '/.src/node_modules/inner/index.d.cts' exists - use it as a name resolution result.
+Resolving real path for '/.src/node_modules/inner/index.d.cts', result '/.src/node_modules/inner/index.d.cts'.
+======== Module name 'inner/cjs/index.cjs' was successfully resolved to '/.src/node_modules/inner/index.d.cts'. ========
+======== Resolving module 'inner/mjs/index.mjs' from '/.src/index.ts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/.src/package.json' exists according to earlier cached lookups.
+Loading module 'inner/mjs/index.mjs' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/.src/node_modules/inner/package.json' exists according to earlier cached lookups.
+Using 'exports' subpath './mjs/*.mjs' with target './index.mjs'.
+File name '/.src/node_modules/inner/index.mjs' has a '.mjs' extension - stripping it.
+File '/.src/node_modules/inner/index.mts' does not exist.
+File '/.src/node_modules/inner/index.d.mts' exists - use it as a name resolution result.
+Resolving real path for '/.src/node_modules/inner/index.d.mts', result '/.src/node_modules/inner/index.d.mts'.
+======== Module name 'inner/mjs/index.mjs' was successfully resolved to '/.src/node_modules/inner/index.d.mts'. ========
+======== Resolving module 'inner/js/index.js' from '/.src/index.ts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/.src/package.json' exists according to earlier cached lookups.
+Loading module 'inner/js/index.js' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/.src/node_modules/inner/package.json' exists according to earlier cached lookups.
+Using 'exports' subpath './js/*.js' with target './index.js'.
+File name '/.src/node_modules/inner/index.js' has a '.js' extension - stripping it.
+File '/.src/node_modules/inner/index.ts' does not exist.
+File '/.src/node_modules/inner/index.tsx' does not exist.
+File '/.src/node_modules/inner/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/.src/node_modules/inner/index.d.ts', result '/.src/node_modules/inner/index.d.ts'.
+======== Module name 'inner/js/index.js' was successfully resolved to '/.src/node_modules/inner/index.d.ts'. ========
+======== Resolving module 'inner/cjs/index.cjs' from '/.src/node_modules/inner/index.d.cts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+Found 'package.json' at '/.src/node_modules/inner/package.json'.
+Using 'exports' subpath './cjs/*.cjs' with target './index.cjs'.
+File name '/.src/node_modules/inner/index.cjs' has a '.cjs' extension - stripping it.
+File '/.src/node_modules/inner/index.cts' does not exist.
+File '/.src/node_modules/inner/index.d.cts' exists - use it as a name resolution result.
+Resolving real path for '/.src/node_modules/inner/index.d.cts', result '/.src/node_modules/inner/index.d.cts'.
+======== Module name 'inner/cjs/index.cjs' was successfully resolved to '/.src/node_modules/inner/index.d.cts'. ========
+======== Resolving module 'inner/mjs/index.mjs' from '/.src/node_modules/inner/index.d.cts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+File '/.src/node_modules/inner/package.json' exists according to earlier cached lookups.
+Using 'exports' subpath './mjs/*.mjs' with target './index.mjs'.
+File name '/.src/node_modules/inner/index.mjs' has a '.mjs' extension - stripping it.
+File '/.src/node_modules/inner/index.mts' does not exist.
+File '/.src/node_modules/inner/index.d.mts' exists - use it as a name resolution result.
+Resolving real path for '/.src/node_modules/inner/index.d.mts', result '/.src/node_modules/inner/index.d.mts'.
+======== Module name 'inner/mjs/index.mjs' was successfully resolved to '/.src/node_modules/inner/index.d.mts'. ========
+======== Resolving module 'inner/js/index.js' from '/.src/node_modules/inner/index.d.cts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+File '/.src/node_modules/inner/package.json' exists according to earlier cached lookups.
+Using 'exports' subpath './js/*.js' with target './index.js'.
+File name '/.src/node_modules/inner/index.js' has a '.js' extension - stripping it.
+File '/.src/node_modules/inner/index.ts' does not exist.
+File '/.src/node_modules/inner/index.tsx' does not exist.
+File '/.src/node_modules/inner/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/.src/node_modules/inner/index.d.ts', result '/.src/node_modules/inner/index.d.ts'.
+======== Module name 'inner/js/index.js' was successfully resolved to '/.src/node_modules/inner/index.d.ts'. ========
+======== Resolving module 'inner/cjs/index.cjs' from '/.src/node_modules/inner/index.d.mts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/.src/node_modules/inner/package.json' exists according to earlier cached lookups.
+Using 'exports' subpath './cjs/*.cjs' with target './index.cjs'.
+File name '/.src/node_modules/inner/index.cjs' has a '.cjs' extension - stripping it.
+File '/.src/node_modules/inner/index.cts' does not exist.
+File '/.src/node_modules/inner/index.d.cts' exists - use it as a name resolution result.
+Resolving real path for '/.src/node_modules/inner/index.d.cts', result '/.src/node_modules/inner/index.d.cts'.
+======== Module name 'inner/cjs/index.cjs' was successfully resolved to '/.src/node_modules/inner/index.d.cts'. ========
+======== Resolving module 'inner/mjs/index.mjs' from '/.src/node_modules/inner/index.d.mts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/.src/node_modules/inner/package.json' exists according to earlier cached lookups.
+Using 'exports' subpath './mjs/*.mjs' with target './index.mjs'.
+File name '/.src/node_modules/inner/index.mjs' has a '.mjs' extension - stripping it.
+File '/.src/node_modules/inner/index.mts' does not exist.
+File '/.src/node_modules/inner/index.d.mts' exists - use it as a name resolution result.
+Resolving real path for '/.src/node_modules/inner/index.d.mts', result '/.src/node_modules/inner/index.d.mts'.
+======== Module name 'inner/mjs/index.mjs' was successfully resolved to '/.src/node_modules/inner/index.d.mts'. ========
+======== Resolving module 'inner/js/index.js' from '/.src/node_modules/inner/index.d.mts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/.src/node_modules/inner/package.json' exists according to earlier cached lookups.
+Using 'exports' subpath './js/*.js' with target './index.js'.
+File name '/.src/node_modules/inner/index.js' has a '.js' extension - stripping it.
+File '/.src/node_modules/inner/index.ts' does not exist.
+File '/.src/node_modules/inner/index.tsx' does not exist.
+File '/.src/node_modules/inner/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/.src/node_modules/inner/index.d.ts', result '/.src/node_modules/inner/index.d.ts'.
+======== Module name 'inner/js/index.js' was successfully resolved to '/.src/node_modules/inner/index.d.ts'. ========
+======== Resolving module 'inner/cjs/index.cjs' from '/.src/node_modules/inner/index.d.ts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+File '/.src/node_modules/inner/package.json' exists according to earlier cached lookups.
+Using 'exports' subpath './cjs/*.cjs' with target './index.cjs'.
+File name '/.src/node_modules/inner/index.cjs' has a '.cjs' extension - stripping it.
+File '/.src/node_modules/inner/index.cts' does not exist.
+File '/.src/node_modules/inner/index.d.cts' exists - use it as a name resolution result.
+Resolving real path for '/.src/node_modules/inner/index.d.cts', result '/.src/node_modules/inner/index.d.cts'.
+======== Module name 'inner/cjs/index.cjs' was successfully resolved to '/.src/node_modules/inner/index.d.cts'. ========
+======== Resolving module 'inner/mjs/index.mjs' from '/.src/node_modules/inner/index.d.ts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+File '/.src/node_modules/inner/package.json' exists according to earlier cached lookups.
+Using 'exports' subpath './mjs/*.mjs' with target './index.mjs'.
+File name '/.src/node_modules/inner/index.mjs' has a '.mjs' extension - stripping it.
+File '/.src/node_modules/inner/index.mts' does not exist.
+File '/.src/node_modules/inner/index.d.mts' exists - use it as a name resolution result.
+Resolving real path for '/.src/node_modules/inner/index.d.mts', result '/.src/node_modules/inner/index.d.mts'.
+======== Module name 'inner/mjs/index.mjs' was successfully resolved to '/.src/node_modules/inner/index.d.mts'. ========
+======== Resolving module 'inner/js/index.js' from '/.src/node_modules/inner/index.d.ts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+File '/.src/node_modules/inner/package.json' exists according to earlier cached lookups.
+Using 'exports' subpath './js/*.js' with target './index.js'.
+File name '/.src/node_modules/inner/index.js' has a '.js' extension - stripping it.
+File '/.src/node_modules/inner/index.ts' does not exist.
+File '/.src/node_modules/inner/index.tsx' does not exist.
+File '/.src/node_modules/inner/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/.src/node_modules/inner/index.d.ts', result '/.src/node_modules/inner/index.d.ts'.
+======== Module name 'inner/js/index.js' was successfully resolved to '/.src/node_modules/inner/index.d.ts'. ========
+======== Resolving module 'inner/cjs/index.cjs' from '/.src/index.mts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/.src/package.json' exists according to earlier cached lookups.
+Loading module 'inner/cjs/index.cjs' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/.src/node_modules/inner/package.json' exists according to earlier cached lookups.
+Using 'exports' subpath './cjs/*.cjs' with target './index.cjs'.
+File name '/.src/node_modules/inner/index.cjs' has a '.cjs' extension - stripping it.
+File '/.src/node_modules/inner/index.cts' does not exist.
+File '/.src/node_modules/inner/index.d.cts' exists - use it as a name resolution result.
+Resolving real path for '/.src/node_modules/inner/index.d.cts', result '/.src/node_modules/inner/index.d.cts'.
+======== Module name 'inner/cjs/index.cjs' was successfully resolved to '/.src/node_modules/inner/index.d.cts'. ========
+======== Resolving module 'inner/mjs/index.mjs' from '/.src/index.mts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/.src/package.json' exists according to earlier cached lookups.
+Loading module 'inner/mjs/index.mjs' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/.src/node_modules/inner/package.json' exists according to earlier cached lookups.
+Using 'exports' subpath './mjs/*.mjs' with target './index.mjs'.
+File name '/.src/node_modules/inner/index.mjs' has a '.mjs' extension - stripping it.
+File '/.src/node_modules/inner/index.mts' does not exist.
+File '/.src/node_modules/inner/index.d.mts' exists - use it as a name resolution result.
+Resolving real path for '/.src/node_modules/inner/index.d.mts', result '/.src/node_modules/inner/index.d.mts'.
+======== Module name 'inner/mjs/index.mjs' was successfully resolved to '/.src/node_modules/inner/index.d.mts'. ========
+======== Resolving module 'inner/js/index.js' from '/.src/index.mts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/.src/package.json' exists according to earlier cached lookups.
+Loading module 'inner/js/index.js' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/.src/node_modules/inner/package.json' exists according to earlier cached lookups.
+Using 'exports' subpath './js/*.js' with target './index.js'.
+File name '/.src/node_modules/inner/index.js' has a '.js' extension - stripping it.
+File '/.src/node_modules/inner/index.ts' does not exist.
+File '/.src/node_modules/inner/index.tsx' does not exist.
+File '/.src/node_modules/inner/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/.src/node_modules/inner/index.d.ts', result '/.src/node_modules/inner/index.d.ts'.
+======== Module name 'inner/js/index.js' was successfully resolved to '/.src/node_modules/inner/index.d.ts'. ========
+======== Resolving module 'inner/cjs/index.cjs' from '/.src/index.cts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+Found 'package.json' at '/.src/package.json'.
+Loading module 'inner/cjs/index.cjs' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/.src/node_modules/inner/package.json' exists according to earlier cached lookups.
+Using 'exports' subpath './cjs/*.cjs' with target './index.cjs'.
+File name '/.src/node_modules/inner/index.cjs' has a '.cjs' extension - stripping it.
+File '/.src/node_modules/inner/index.cts' does not exist.
+File '/.src/node_modules/inner/index.d.cts' exists - use it as a name resolution result.
+Resolving real path for '/.src/node_modules/inner/index.d.cts', result '/.src/node_modules/inner/index.d.cts'.
+======== Module name 'inner/cjs/index.cjs' was successfully resolved to '/.src/node_modules/inner/index.d.cts'. ========
+======== Resolving module 'inner/mjs/index.mjs' from '/.src/index.cts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+File '/.src/package.json' exists according to earlier cached lookups.
+Loading module 'inner/mjs/index.mjs' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/.src/node_modules/inner/package.json' exists according to earlier cached lookups.
+Using 'exports' subpath './mjs/*.mjs' with target './index.mjs'.
+File name '/.src/node_modules/inner/index.mjs' has a '.mjs' extension - stripping it.
+File '/.src/node_modules/inner/index.mts' does not exist.
+File '/.src/node_modules/inner/index.d.mts' exists - use it as a name resolution result.
+Resolving real path for '/.src/node_modules/inner/index.d.mts', result '/.src/node_modules/inner/index.d.mts'.
+======== Module name 'inner/mjs/index.mjs' was successfully resolved to '/.src/node_modules/inner/index.d.mts'. ========
+======== Resolving module 'inner/js/index.js' from '/.src/index.cts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+File '/.src/package.json' exists according to earlier cached lookups.
+Loading module 'inner/js/index.js' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/.src/node_modules/inner/package.json' exists according to earlier cached lookups.
+Using 'exports' subpath './js/*.js' with target './index.js'.
+File name '/.src/node_modules/inner/index.js' has a '.js' extension - stripping it.
+File '/.src/node_modules/inner/index.ts' does not exist.
+File '/.src/node_modules/inner/index.tsx' does not exist.
+File '/.src/node_modules/inner/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/.src/node_modules/inner/index.d.ts', result '/.src/node_modules/inner/index.d.ts'.
+======== Module name 'inner/js/index.js' was successfully resolved to '/.src/node_modules/inner/index.d.ts'. ========
diff --git a/testdata/baselines/reference/submodule/conformance/nodeModulesPackagePatternExportsTrailers(module=node18).trace.json b/testdata/baselines/reference/submodule/conformance/nodeModulesPackagePatternExportsTrailers(module=node18).trace.json
new file mode 100644
index 0000000000..4ee363b110
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/nodeModulesPackagePatternExportsTrailers(module=node18).trace.json
@@ -0,0 +1,213 @@
+======== Resolving module 'inner/cjs/index.cjs' from '/.src/index.ts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/.src/package.json' exists according to earlier cached lookups.
+Loading module 'inner/cjs/index.cjs' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/.src/node_modules/inner/package.json' exists according to earlier cached lookups.
+Using 'exports' subpath './cjs/*.cjs' with target './index.cjs'.
+File name '/.src/node_modules/inner/index.cjs' has a '.cjs' extension - stripping it.
+File '/.src/node_modules/inner/index.cts' does not exist.
+File '/.src/node_modules/inner/index.d.cts' exists - use it as a name resolution result.
+Resolving real path for '/.src/node_modules/inner/index.d.cts', result '/.src/node_modules/inner/index.d.cts'.
+======== Module name 'inner/cjs/index.cjs' was successfully resolved to '/.src/node_modules/inner/index.d.cts'. ========
+======== Resolving module 'inner/mjs/index.mjs' from '/.src/index.ts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/.src/package.json' exists according to earlier cached lookups.
+Loading module 'inner/mjs/index.mjs' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/.src/node_modules/inner/package.json' exists according to earlier cached lookups.
+Using 'exports' subpath './mjs/*.mjs' with target './index.mjs'.
+File name '/.src/node_modules/inner/index.mjs' has a '.mjs' extension - stripping it.
+File '/.src/node_modules/inner/index.mts' does not exist.
+File '/.src/node_modules/inner/index.d.mts' exists - use it as a name resolution result.
+Resolving real path for '/.src/node_modules/inner/index.d.mts', result '/.src/node_modules/inner/index.d.mts'.
+======== Module name 'inner/mjs/index.mjs' was successfully resolved to '/.src/node_modules/inner/index.d.mts'. ========
+======== Resolving module 'inner/js/index.js' from '/.src/index.ts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/.src/package.json' exists according to earlier cached lookups.
+Loading module 'inner/js/index.js' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/.src/node_modules/inner/package.json' exists according to earlier cached lookups.
+Using 'exports' subpath './js/*.js' with target './index.js'.
+File name '/.src/node_modules/inner/index.js' has a '.js' extension - stripping it.
+File '/.src/node_modules/inner/index.ts' does not exist.
+File '/.src/node_modules/inner/index.tsx' does not exist.
+File '/.src/node_modules/inner/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/.src/node_modules/inner/index.d.ts', result '/.src/node_modules/inner/index.d.ts'.
+======== Module name 'inner/js/index.js' was successfully resolved to '/.src/node_modules/inner/index.d.ts'. ========
+======== Resolving module 'inner/cjs/index.cjs' from '/.src/node_modules/inner/index.d.cts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+Found 'package.json' at '/.src/node_modules/inner/package.json'.
+Using 'exports' subpath './cjs/*.cjs' with target './index.cjs'.
+File name '/.src/node_modules/inner/index.cjs' has a '.cjs' extension - stripping it.
+File '/.src/node_modules/inner/index.cts' does not exist.
+File '/.src/node_modules/inner/index.d.cts' exists - use it as a name resolution result.
+Resolving real path for '/.src/node_modules/inner/index.d.cts', result '/.src/node_modules/inner/index.d.cts'.
+======== Module name 'inner/cjs/index.cjs' was successfully resolved to '/.src/node_modules/inner/index.d.cts'. ========
+======== Resolving module 'inner/mjs/index.mjs' from '/.src/node_modules/inner/index.d.cts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+File '/.src/node_modules/inner/package.json' exists according to earlier cached lookups.
+Using 'exports' subpath './mjs/*.mjs' with target './index.mjs'.
+File name '/.src/node_modules/inner/index.mjs' has a '.mjs' extension - stripping it.
+File '/.src/node_modules/inner/index.mts' does not exist.
+File '/.src/node_modules/inner/index.d.mts' exists - use it as a name resolution result.
+Resolving real path for '/.src/node_modules/inner/index.d.mts', result '/.src/node_modules/inner/index.d.mts'.
+======== Module name 'inner/mjs/index.mjs' was successfully resolved to '/.src/node_modules/inner/index.d.mts'. ========
+======== Resolving module 'inner/js/index.js' from '/.src/node_modules/inner/index.d.cts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+File '/.src/node_modules/inner/package.json' exists according to earlier cached lookups.
+Using 'exports' subpath './js/*.js' with target './index.js'.
+File name '/.src/node_modules/inner/index.js' has a '.js' extension - stripping it.
+File '/.src/node_modules/inner/index.ts' does not exist.
+File '/.src/node_modules/inner/index.tsx' does not exist.
+File '/.src/node_modules/inner/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/.src/node_modules/inner/index.d.ts', result '/.src/node_modules/inner/index.d.ts'.
+======== Module name 'inner/js/index.js' was successfully resolved to '/.src/node_modules/inner/index.d.ts'. ========
+======== Resolving module 'inner/cjs/index.cjs' from '/.src/node_modules/inner/index.d.mts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/.src/node_modules/inner/package.json' exists according to earlier cached lookups.
+Using 'exports' subpath './cjs/*.cjs' with target './index.cjs'.
+File name '/.src/node_modules/inner/index.cjs' has a '.cjs' extension - stripping it.
+File '/.src/node_modules/inner/index.cts' does not exist.
+File '/.src/node_modules/inner/index.d.cts' exists - use it as a name resolution result.
+Resolving real path for '/.src/node_modules/inner/index.d.cts', result '/.src/node_modules/inner/index.d.cts'.
+======== Module name 'inner/cjs/index.cjs' was successfully resolved to '/.src/node_modules/inner/index.d.cts'. ========
+======== Resolving module 'inner/mjs/index.mjs' from '/.src/node_modules/inner/index.d.mts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/.src/node_modules/inner/package.json' exists according to earlier cached lookups.
+Using 'exports' subpath './mjs/*.mjs' with target './index.mjs'.
+File name '/.src/node_modules/inner/index.mjs' has a '.mjs' extension - stripping it.
+File '/.src/node_modules/inner/index.mts' does not exist.
+File '/.src/node_modules/inner/index.d.mts' exists - use it as a name resolution result.
+Resolving real path for '/.src/node_modules/inner/index.d.mts', result '/.src/node_modules/inner/index.d.mts'.
+======== Module name 'inner/mjs/index.mjs' was successfully resolved to '/.src/node_modules/inner/index.d.mts'. ========
+======== Resolving module 'inner/js/index.js' from '/.src/node_modules/inner/index.d.mts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/.src/node_modules/inner/package.json' exists according to earlier cached lookups.
+Using 'exports' subpath './js/*.js' with target './index.js'.
+File name '/.src/node_modules/inner/index.js' has a '.js' extension - stripping it.
+File '/.src/node_modules/inner/index.ts' does not exist.
+File '/.src/node_modules/inner/index.tsx' does not exist.
+File '/.src/node_modules/inner/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/.src/node_modules/inner/index.d.ts', result '/.src/node_modules/inner/index.d.ts'.
+======== Module name 'inner/js/index.js' was successfully resolved to '/.src/node_modules/inner/index.d.ts'. ========
+======== Resolving module 'inner/cjs/index.cjs' from '/.src/node_modules/inner/index.d.ts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+File '/.src/node_modules/inner/package.json' exists according to earlier cached lookups.
+Using 'exports' subpath './cjs/*.cjs' with target './index.cjs'.
+File name '/.src/node_modules/inner/index.cjs' has a '.cjs' extension - stripping it.
+File '/.src/node_modules/inner/index.cts' does not exist.
+File '/.src/node_modules/inner/index.d.cts' exists - use it as a name resolution result.
+Resolving real path for '/.src/node_modules/inner/index.d.cts', result '/.src/node_modules/inner/index.d.cts'.
+======== Module name 'inner/cjs/index.cjs' was successfully resolved to '/.src/node_modules/inner/index.d.cts'. ========
+======== Resolving module 'inner/mjs/index.mjs' from '/.src/node_modules/inner/index.d.ts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+File '/.src/node_modules/inner/package.json' exists according to earlier cached lookups.
+Using 'exports' subpath './mjs/*.mjs' with target './index.mjs'.
+File name '/.src/node_modules/inner/index.mjs' has a '.mjs' extension - stripping it.
+File '/.src/node_modules/inner/index.mts' does not exist.
+File '/.src/node_modules/inner/index.d.mts' exists - use it as a name resolution result.
+Resolving real path for '/.src/node_modules/inner/index.d.mts', result '/.src/node_modules/inner/index.d.mts'.
+======== Module name 'inner/mjs/index.mjs' was successfully resolved to '/.src/node_modules/inner/index.d.mts'. ========
+======== Resolving module 'inner/js/index.js' from '/.src/node_modules/inner/index.d.ts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+File '/.src/node_modules/inner/package.json' exists according to earlier cached lookups.
+Using 'exports' subpath './js/*.js' with target './index.js'.
+File name '/.src/node_modules/inner/index.js' has a '.js' extension - stripping it.
+File '/.src/node_modules/inner/index.ts' does not exist.
+File '/.src/node_modules/inner/index.tsx' does not exist.
+File '/.src/node_modules/inner/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/.src/node_modules/inner/index.d.ts', result '/.src/node_modules/inner/index.d.ts'.
+======== Module name 'inner/js/index.js' was successfully resolved to '/.src/node_modules/inner/index.d.ts'. ========
+======== Resolving module 'inner/cjs/index.cjs' from '/.src/index.mts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/.src/package.json' exists according to earlier cached lookups.
+Loading module 'inner/cjs/index.cjs' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/.src/node_modules/inner/package.json' exists according to earlier cached lookups.
+Using 'exports' subpath './cjs/*.cjs' with target './index.cjs'.
+File name '/.src/node_modules/inner/index.cjs' has a '.cjs' extension - stripping it.
+File '/.src/node_modules/inner/index.cts' does not exist.
+File '/.src/node_modules/inner/index.d.cts' exists - use it as a name resolution result.
+Resolving real path for '/.src/node_modules/inner/index.d.cts', result '/.src/node_modules/inner/index.d.cts'.
+======== Module name 'inner/cjs/index.cjs' was successfully resolved to '/.src/node_modules/inner/index.d.cts'. ========
+======== Resolving module 'inner/mjs/index.mjs' from '/.src/index.mts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/.src/package.json' exists according to earlier cached lookups.
+Loading module 'inner/mjs/index.mjs' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/.src/node_modules/inner/package.json' exists according to earlier cached lookups.
+Using 'exports' subpath './mjs/*.mjs' with target './index.mjs'.
+File name '/.src/node_modules/inner/index.mjs' has a '.mjs' extension - stripping it.
+File '/.src/node_modules/inner/index.mts' does not exist.
+File '/.src/node_modules/inner/index.d.mts' exists - use it as a name resolution result.
+Resolving real path for '/.src/node_modules/inner/index.d.mts', result '/.src/node_modules/inner/index.d.mts'.
+======== Module name 'inner/mjs/index.mjs' was successfully resolved to '/.src/node_modules/inner/index.d.mts'. ========
+======== Resolving module 'inner/js/index.js' from '/.src/index.mts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/.src/package.json' exists according to earlier cached lookups.
+Loading module 'inner/js/index.js' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/.src/node_modules/inner/package.json' exists according to earlier cached lookups.
+Using 'exports' subpath './js/*.js' with target './index.js'.
+File name '/.src/node_modules/inner/index.js' has a '.js' extension - stripping it.
+File '/.src/node_modules/inner/index.ts' does not exist.
+File '/.src/node_modules/inner/index.tsx' does not exist.
+File '/.src/node_modules/inner/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/.src/node_modules/inner/index.d.ts', result '/.src/node_modules/inner/index.d.ts'.
+======== Module name 'inner/js/index.js' was successfully resolved to '/.src/node_modules/inner/index.d.ts'. ========
+======== Resolving module 'inner/cjs/index.cjs' from '/.src/index.cts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+Found 'package.json' at '/.src/package.json'.
+Loading module 'inner/cjs/index.cjs' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/.src/node_modules/inner/package.json' exists according to earlier cached lookups.
+Using 'exports' subpath './cjs/*.cjs' with target './index.cjs'.
+File name '/.src/node_modules/inner/index.cjs' has a '.cjs' extension - stripping it.
+File '/.src/node_modules/inner/index.cts' does not exist.
+File '/.src/node_modules/inner/index.d.cts' exists - use it as a name resolution result.
+Resolving real path for '/.src/node_modules/inner/index.d.cts', result '/.src/node_modules/inner/index.d.cts'.
+======== Module name 'inner/cjs/index.cjs' was successfully resolved to '/.src/node_modules/inner/index.d.cts'. ========
+======== Resolving module 'inner/mjs/index.mjs' from '/.src/index.cts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+File '/.src/package.json' exists according to earlier cached lookups.
+Loading module 'inner/mjs/index.mjs' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/.src/node_modules/inner/package.json' exists according to earlier cached lookups.
+Using 'exports' subpath './mjs/*.mjs' with target './index.mjs'.
+File name '/.src/node_modules/inner/index.mjs' has a '.mjs' extension - stripping it.
+File '/.src/node_modules/inner/index.mts' does not exist.
+File '/.src/node_modules/inner/index.d.mts' exists - use it as a name resolution result.
+Resolving real path for '/.src/node_modules/inner/index.d.mts', result '/.src/node_modules/inner/index.d.mts'.
+======== Module name 'inner/mjs/index.mjs' was successfully resolved to '/.src/node_modules/inner/index.d.mts'. ========
+======== Resolving module 'inner/js/index.js' from '/.src/index.cts'. ========
+Module resolution kind is not specified, using 'Node16'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+File '/.src/package.json' exists according to earlier cached lookups.
+Loading module 'inner/js/index.js' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/.src/node_modules/inner/package.json' exists according to earlier cached lookups.
+Using 'exports' subpath './js/*.js' with target './index.js'.
+File name '/.src/node_modules/inner/index.js' has a '.js' extension - stripping it.
+File '/.src/node_modules/inner/index.ts' does not exist.
+File '/.src/node_modules/inner/index.tsx' does not exist.
+File '/.src/node_modules/inner/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/.src/node_modules/inner/index.d.ts', result '/.src/node_modules/inner/index.d.ts'.
+======== Module name 'inner/js/index.js' was successfully resolved to '/.src/node_modules/inner/index.d.ts'. ========
diff --git a/testdata/baselines/reference/submodule/conformance/nodeModulesPackagePatternExportsTrailers(module=nodenext).trace.json b/testdata/baselines/reference/submodule/conformance/nodeModulesPackagePatternExportsTrailers(module=nodenext).trace.json
new file mode 100644
index 0000000000..07a1a40899
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/nodeModulesPackagePatternExportsTrailers(module=nodenext).trace.json
@@ -0,0 +1,213 @@
+======== Resolving module 'inner/cjs/index.cjs' from '/.src/index.ts'. ========
+Module resolution kind is not specified, using 'NodeNext'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/.src/package.json' exists according to earlier cached lookups.
+Loading module 'inner/cjs/index.cjs' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/.src/node_modules/inner/package.json' exists according to earlier cached lookups.
+Using 'exports' subpath './cjs/*.cjs' with target './index.cjs'.
+File name '/.src/node_modules/inner/index.cjs' has a '.cjs' extension - stripping it.
+File '/.src/node_modules/inner/index.cts' does not exist.
+File '/.src/node_modules/inner/index.d.cts' exists - use it as a name resolution result.
+Resolving real path for '/.src/node_modules/inner/index.d.cts', result '/.src/node_modules/inner/index.d.cts'.
+======== Module name 'inner/cjs/index.cjs' was successfully resolved to '/.src/node_modules/inner/index.d.cts'. ========
+======== Resolving module 'inner/mjs/index.mjs' from '/.src/index.ts'. ========
+Module resolution kind is not specified, using 'NodeNext'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/.src/package.json' exists according to earlier cached lookups.
+Loading module 'inner/mjs/index.mjs' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/.src/node_modules/inner/package.json' exists according to earlier cached lookups.
+Using 'exports' subpath './mjs/*.mjs' with target './index.mjs'.
+File name '/.src/node_modules/inner/index.mjs' has a '.mjs' extension - stripping it.
+File '/.src/node_modules/inner/index.mts' does not exist.
+File '/.src/node_modules/inner/index.d.mts' exists - use it as a name resolution result.
+Resolving real path for '/.src/node_modules/inner/index.d.mts', result '/.src/node_modules/inner/index.d.mts'.
+======== Module name 'inner/mjs/index.mjs' was successfully resolved to '/.src/node_modules/inner/index.d.mts'. ========
+======== Resolving module 'inner/js/index.js' from '/.src/index.ts'. ========
+Module resolution kind is not specified, using 'NodeNext'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/.src/package.json' exists according to earlier cached lookups.
+Loading module 'inner/js/index.js' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/.src/node_modules/inner/package.json' exists according to earlier cached lookups.
+Using 'exports' subpath './js/*.js' with target './index.js'.
+File name '/.src/node_modules/inner/index.js' has a '.js' extension - stripping it.
+File '/.src/node_modules/inner/index.ts' does not exist.
+File '/.src/node_modules/inner/index.tsx' does not exist.
+File '/.src/node_modules/inner/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/.src/node_modules/inner/index.d.ts', result '/.src/node_modules/inner/index.d.ts'.
+======== Module name 'inner/js/index.js' was successfully resolved to '/.src/node_modules/inner/index.d.ts'. ========
+======== Resolving module 'inner/cjs/index.cjs' from '/.src/node_modules/inner/index.d.cts'. ========
+Module resolution kind is not specified, using 'NodeNext'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+Found 'package.json' at '/.src/node_modules/inner/package.json'.
+Using 'exports' subpath './cjs/*.cjs' with target './index.cjs'.
+File name '/.src/node_modules/inner/index.cjs' has a '.cjs' extension - stripping it.
+File '/.src/node_modules/inner/index.cts' does not exist.
+File '/.src/node_modules/inner/index.d.cts' exists - use it as a name resolution result.
+Resolving real path for '/.src/node_modules/inner/index.d.cts', result '/.src/node_modules/inner/index.d.cts'.
+======== Module name 'inner/cjs/index.cjs' was successfully resolved to '/.src/node_modules/inner/index.d.cts'. ========
+======== Resolving module 'inner/mjs/index.mjs' from '/.src/node_modules/inner/index.d.cts'. ========
+Module resolution kind is not specified, using 'NodeNext'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+File '/.src/node_modules/inner/package.json' exists according to earlier cached lookups.
+Using 'exports' subpath './mjs/*.mjs' with target './index.mjs'.
+File name '/.src/node_modules/inner/index.mjs' has a '.mjs' extension - stripping it.
+File '/.src/node_modules/inner/index.mts' does not exist.
+File '/.src/node_modules/inner/index.d.mts' exists - use it as a name resolution result.
+Resolving real path for '/.src/node_modules/inner/index.d.mts', result '/.src/node_modules/inner/index.d.mts'.
+======== Module name 'inner/mjs/index.mjs' was successfully resolved to '/.src/node_modules/inner/index.d.mts'. ========
+======== Resolving module 'inner/js/index.js' from '/.src/node_modules/inner/index.d.cts'. ========
+Module resolution kind is not specified, using 'NodeNext'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+File '/.src/node_modules/inner/package.json' exists according to earlier cached lookups.
+Using 'exports' subpath './js/*.js' with target './index.js'.
+File name '/.src/node_modules/inner/index.js' has a '.js' extension - stripping it.
+File '/.src/node_modules/inner/index.ts' does not exist.
+File '/.src/node_modules/inner/index.tsx' does not exist.
+File '/.src/node_modules/inner/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/.src/node_modules/inner/index.d.ts', result '/.src/node_modules/inner/index.d.ts'.
+======== Module name 'inner/js/index.js' was successfully resolved to '/.src/node_modules/inner/index.d.ts'. ========
+======== Resolving module 'inner/cjs/index.cjs' from '/.src/node_modules/inner/index.d.mts'. ========
+Module resolution kind is not specified, using 'NodeNext'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/.src/node_modules/inner/package.json' exists according to earlier cached lookups.
+Using 'exports' subpath './cjs/*.cjs' with target './index.cjs'.
+File name '/.src/node_modules/inner/index.cjs' has a '.cjs' extension - stripping it.
+File '/.src/node_modules/inner/index.cts' does not exist.
+File '/.src/node_modules/inner/index.d.cts' exists - use it as a name resolution result.
+Resolving real path for '/.src/node_modules/inner/index.d.cts', result '/.src/node_modules/inner/index.d.cts'.
+======== Module name 'inner/cjs/index.cjs' was successfully resolved to '/.src/node_modules/inner/index.d.cts'. ========
+======== Resolving module 'inner/mjs/index.mjs' from '/.src/node_modules/inner/index.d.mts'. ========
+Module resolution kind is not specified, using 'NodeNext'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/.src/node_modules/inner/package.json' exists according to earlier cached lookups.
+Using 'exports' subpath './mjs/*.mjs' with target './index.mjs'.
+File name '/.src/node_modules/inner/index.mjs' has a '.mjs' extension - stripping it.
+File '/.src/node_modules/inner/index.mts' does not exist.
+File '/.src/node_modules/inner/index.d.mts' exists - use it as a name resolution result.
+Resolving real path for '/.src/node_modules/inner/index.d.mts', result '/.src/node_modules/inner/index.d.mts'.
+======== Module name 'inner/mjs/index.mjs' was successfully resolved to '/.src/node_modules/inner/index.d.mts'. ========
+======== Resolving module 'inner/js/index.js' from '/.src/node_modules/inner/index.d.mts'. ========
+Module resolution kind is not specified, using 'NodeNext'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/.src/node_modules/inner/package.json' exists according to earlier cached lookups.
+Using 'exports' subpath './js/*.js' with target './index.js'.
+File name '/.src/node_modules/inner/index.js' has a '.js' extension - stripping it.
+File '/.src/node_modules/inner/index.ts' does not exist.
+File '/.src/node_modules/inner/index.tsx' does not exist.
+File '/.src/node_modules/inner/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/.src/node_modules/inner/index.d.ts', result '/.src/node_modules/inner/index.d.ts'.
+======== Module name 'inner/js/index.js' was successfully resolved to '/.src/node_modules/inner/index.d.ts'. ========
+======== Resolving module 'inner/cjs/index.cjs' from '/.src/node_modules/inner/index.d.ts'. ========
+Module resolution kind is not specified, using 'NodeNext'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+File '/.src/node_modules/inner/package.json' exists according to earlier cached lookups.
+Using 'exports' subpath './cjs/*.cjs' with target './index.cjs'.
+File name '/.src/node_modules/inner/index.cjs' has a '.cjs' extension - stripping it.
+File '/.src/node_modules/inner/index.cts' does not exist.
+File '/.src/node_modules/inner/index.d.cts' exists - use it as a name resolution result.
+Resolving real path for '/.src/node_modules/inner/index.d.cts', result '/.src/node_modules/inner/index.d.cts'.
+======== Module name 'inner/cjs/index.cjs' was successfully resolved to '/.src/node_modules/inner/index.d.cts'. ========
+======== Resolving module 'inner/mjs/index.mjs' from '/.src/node_modules/inner/index.d.ts'. ========
+Module resolution kind is not specified, using 'NodeNext'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+File '/.src/node_modules/inner/package.json' exists according to earlier cached lookups.
+Using 'exports' subpath './mjs/*.mjs' with target './index.mjs'.
+File name '/.src/node_modules/inner/index.mjs' has a '.mjs' extension - stripping it.
+File '/.src/node_modules/inner/index.mts' does not exist.
+File '/.src/node_modules/inner/index.d.mts' exists - use it as a name resolution result.
+Resolving real path for '/.src/node_modules/inner/index.d.mts', result '/.src/node_modules/inner/index.d.mts'.
+======== Module name 'inner/mjs/index.mjs' was successfully resolved to '/.src/node_modules/inner/index.d.mts'. ========
+======== Resolving module 'inner/js/index.js' from '/.src/node_modules/inner/index.d.ts'. ========
+Module resolution kind is not specified, using 'NodeNext'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+File '/.src/node_modules/inner/package.json' exists according to earlier cached lookups.
+Using 'exports' subpath './js/*.js' with target './index.js'.
+File name '/.src/node_modules/inner/index.js' has a '.js' extension - stripping it.
+File '/.src/node_modules/inner/index.ts' does not exist.
+File '/.src/node_modules/inner/index.tsx' does not exist.
+File '/.src/node_modules/inner/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/.src/node_modules/inner/index.d.ts', result '/.src/node_modules/inner/index.d.ts'.
+======== Module name 'inner/js/index.js' was successfully resolved to '/.src/node_modules/inner/index.d.ts'. ========
+======== Resolving module 'inner/cjs/index.cjs' from '/.src/index.mts'. ========
+Module resolution kind is not specified, using 'NodeNext'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/.src/package.json' exists according to earlier cached lookups.
+Loading module 'inner/cjs/index.cjs' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/.src/node_modules/inner/package.json' exists according to earlier cached lookups.
+Using 'exports' subpath './cjs/*.cjs' with target './index.cjs'.
+File name '/.src/node_modules/inner/index.cjs' has a '.cjs' extension - stripping it.
+File '/.src/node_modules/inner/index.cts' does not exist.
+File '/.src/node_modules/inner/index.d.cts' exists - use it as a name resolution result.
+Resolving real path for '/.src/node_modules/inner/index.d.cts', result '/.src/node_modules/inner/index.d.cts'.
+======== Module name 'inner/cjs/index.cjs' was successfully resolved to '/.src/node_modules/inner/index.d.cts'. ========
+======== Resolving module 'inner/mjs/index.mjs' from '/.src/index.mts'. ========
+Module resolution kind is not specified, using 'NodeNext'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/.src/package.json' exists according to earlier cached lookups.
+Loading module 'inner/mjs/index.mjs' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/.src/node_modules/inner/package.json' exists according to earlier cached lookups.
+Using 'exports' subpath './mjs/*.mjs' with target './index.mjs'.
+File name '/.src/node_modules/inner/index.mjs' has a '.mjs' extension - stripping it.
+File '/.src/node_modules/inner/index.mts' does not exist.
+File '/.src/node_modules/inner/index.d.mts' exists - use it as a name resolution result.
+Resolving real path for '/.src/node_modules/inner/index.d.mts', result '/.src/node_modules/inner/index.d.mts'.
+======== Module name 'inner/mjs/index.mjs' was successfully resolved to '/.src/node_modules/inner/index.d.mts'. ========
+======== Resolving module 'inner/js/index.js' from '/.src/index.mts'. ========
+Module resolution kind is not specified, using 'NodeNext'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/.src/package.json' exists according to earlier cached lookups.
+Loading module 'inner/js/index.js' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/.src/node_modules/inner/package.json' exists according to earlier cached lookups.
+Using 'exports' subpath './js/*.js' with target './index.js'.
+File name '/.src/node_modules/inner/index.js' has a '.js' extension - stripping it.
+File '/.src/node_modules/inner/index.ts' does not exist.
+File '/.src/node_modules/inner/index.tsx' does not exist.
+File '/.src/node_modules/inner/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/.src/node_modules/inner/index.d.ts', result '/.src/node_modules/inner/index.d.ts'.
+======== Module name 'inner/js/index.js' was successfully resolved to '/.src/node_modules/inner/index.d.ts'. ========
+======== Resolving module 'inner/cjs/index.cjs' from '/.src/index.cts'. ========
+Module resolution kind is not specified, using 'NodeNext'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+Found 'package.json' at '/.src/package.json'.
+Loading module 'inner/cjs/index.cjs' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/.src/node_modules/inner/package.json' exists according to earlier cached lookups.
+Using 'exports' subpath './cjs/*.cjs' with target './index.cjs'.
+File name '/.src/node_modules/inner/index.cjs' has a '.cjs' extension - stripping it.
+File '/.src/node_modules/inner/index.cts' does not exist.
+File '/.src/node_modules/inner/index.d.cts' exists - use it as a name resolution result.
+Resolving real path for '/.src/node_modules/inner/index.d.cts', result '/.src/node_modules/inner/index.d.cts'.
+======== Module name 'inner/cjs/index.cjs' was successfully resolved to '/.src/node_modules/inner/index.d.cts'. ========
+======== Resolving module 'inner/mjs/index.mjs' from '/.src/index.cts'. ========
+Module resolution kind is not specified, using 'NodeNext'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+File '/.src/package.json' exists according to earlier cached lookups.
+Loading module 'inner/mjs/index.mjs' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/.src/node_modules/inner/package.json' exists according to earlier cached lookups.
+Using 'exports' subpath './mjs/*.mjs' with target './index.mjs'.
+File name '/.src/node_modules/inner/index.mjs' has a '.mjs' extension - stripping it.
+File '/.src/node_modules/inner/index.mts' does not exist.
+File '/.src/node_modules/inner/index.d.mts' exists - use it as a name resolution result.
+Resolving real path for '/.src/node_modules/inner/index.d.mts', result '/.src/node_modules/inner/index.d.mts'.
+======== Module name 'inner/mjs/index.mjs' was successfully resolved to '/.src/node_modules/inner/index.d.mts'. ========
+======== Resolving module 'inner/js/index.js' from '/.src/index.cts'. ========
+Module resolution kind is not specified, using 'NodeNext'.
+Resolving in CJS mode with conditions 'require', 'types', 'node'.
+File '/.src/package.json' exists according to earlier cached lookups.
+Loading module 'inner/js/index.js' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/.src/node_modules/inner/package.json' exists according to earlier cached lookups.
+Using 'exports' subpath './js/*.js' with target './index.js'.
+File name '/.src/node_modules/inner/index.js' has a '.js' extension - stripping it.
+File '/.src/node_modules/inner/index.ts' does not exist.
+File '/.src/node_modules/inner/index.tsx' does not exist.
+File '/.src/node_modules/inner/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/.src/node_modules/inner/index.d.ts', result '/.src/node_modules/inner/index.d.ts'.
+======== Module name 'inner/js/index.js' was successfully resolved to '/.src/node_modules/inner/index.d.ts'. ========
diff --git a/testdata/baselines/reference/submodule/conformance/packageJsonMain.trace.json b/testdata/baselines/reference/submodule/conformance/packageJsonMain.trace.json
new file mode 100644
index 0000000000..fb59dd4cab
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/packageJsonMain.trace.json
@@ -0,0 +1,108 @@
+======== Resolving module 'foo' from '/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/package.json' does not exist.
+Loading module 'foo' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Found 'package.json' at '/node_modules/foo/package.json'.
+File '/node_modules/foo.ts' does not exist.
+File '/node_modules/foo.tsx' does not exist.
+File '/node_modules/foo.d.ts' does not exist.
+'package.json' does not have a 'typesVersions' field.
+'package.json' does not have a 'typings' field.
+'package.json' does not have a 'types' field.
+'package.json' has 'main' field 'oof' that references '/node_modules/foo/oof'.
+Loading module as file / folder, candidate module location '/node_modules/foo/oof', target file types: TypeScript, Declaration.
+File '/node_modules/foo/oof.ts' does not exist.
+File '/node_modules/foo/oof.tsx' does not exist.
+File '/node_modules/foo/oof.d.ts' does not exist.
+Directory '/node_modules/foo/oof' does not exist, skipping all lookups in it.
+File '/node_modules/foo/index.ts' does not exist.
+File '/node_modules/foo/index.tsx' does not exist.
+File '/node_modules/foo/index.d.ts' does not exist.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript, JSON.
+File '/node_modules/foo/package.json' exists according to earlier cached lookups.
+File '/node_modules/foo.js' does not exist.
+File '/node_modules/foo.jsx' does not exist.
+'package.json' has 'main' field 'oof' that references '/node_modules/foo/oof'.
+Loading module as file / folder, candidate module location '/node_modules/foo/oof', target file types: JavaScript, JSON.
+File '/node_modules/foo/oof.js' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/foo/oof.js', result '/node_modules/foo/oof.js'.
+======== Module name 'foo' was successfully resolved to '/node_modules/foo/oof.js'. ========
+======== Resolving module 'bar' from '/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'bar' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Found 'package.json' at '/node_modules/bar/package.json'.
+File '/node_modules/bar.ts' does not exist.
+File '/node_modules/bar.tsx' does not exist.
+File '/node_modules/bar.d.ts' does not exist.
+'package.json' does not have a 'typesVersions' field.
+'package.json' does not have a 'typings' field.
+'package.json' does not have a 'types' field.
+'package.json' has 'main' field 'rab.js' that references '/node_modules/bar/rab.js'.
+File name '/node_modules/bar/rab.js' has a '.js' extension - stripping it.
+File '/node_modules/bar/rab.ts' does not exist.
+File '/node_modules/bar/rab.tsx' does not exist.
+File '/node_modules/bar/rab.d.ts' does not exist.
+Loading module as file / folder, candidate module location '/node_modules/bar/rab.js', target file types: TypeScript, Declaration.
+File name '/node_modules/bar/rab.js' has a '.js' extension - stripping it.
+File '/node_modules/bar/rab.ts' does not exist.
+File '/node_modules/bar/rab.tsx' does not exist.
+File '/node_modules/bar/rab.d.ts' does not exist.
+File '/node_modules/bar/rab.js.ts' does not exist.
+File '/node_modules/bar/rab.js.tsx' does not exist.
+File '/node_modules/bar/rab.js.d.ts' does not exist.
+Directory '/node_modules/bar/rab.js' does not exist, skipping all lookups in it.
+File '/node_modules/bar/index.ts' does not exist.
+File '/node_modules/bar/index.tsx' does not exist.
+File '/node_modules/bar/index.d.ts' does not exist.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript, JSON.
+File '/node_modules/bar/package.json' exists according to earlier cached lookups.
+File '/node_modules/bar.js' does not exist.
+File '/node_modules/bar.jsx' does not exist.
+'package.json' has 'main' field 'rab.js' that references '/node_modules/bar/rab.js'.
+File name '/node_modules/bar/rab.js' has a '.js' extension - stripping it.
+File '/node_modules/bar/rab.js' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/bar/rab.js', result '/node_modules/bar/rab.js'.
+======== Module name 'bar' was successfully resolved to '/node_modules/bar/rab.js'. ========
+======== Resolving module 'baz' from '/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'baz' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Found 'package.json' at '/node_modules/baz/package.json'.
+File '/node_modules/baz.ts' does not exist.
+File '/node_modules/baz.tsx' does not exist.
+File '/node_modules/baz.d.ts' does not exist.
+'package.json' does not have a 'typesVersions' field.
+'package.json' does not have a 'typings' field.
+'package.json' does not have a 'types' field.
+'package.json' has 'main' field 'zab' that references '/node_modules/baz/zab'.
+Loading module as file / folder, candidate module location '/node_modules/baz/zab', target file types: TypeScript, Declaration.
+File '/node_modules/baz/zab.ts' does not exist.
+File '/node_modules/baz/zab.tsx' does not exist.
+File '/node_modules/baz/zab.d.ts' does not exist.
+File '/node_modules/baz/zab/index.ts' does not exist.
+File '/node_modules/baz/zab/index.tsx' does not exist.
+File '/node_modules/baz/zab/index.d.ts' does not exist.
+File '/node_modules/baz/index.ts' does not exist.
+File '/node_modules/baz/index.tsx' does not exist.
+File '/node_modules/baz/index.d.ts' does not exist.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript, JSON.
+File '/node_modules/baz/package.json' exists according to earlier cached lookups.
+File '/node_modules/baz.js' does not exist.
+File '/node_modules/baz.jsx' does not exist.
+'package.json' has 'main' field 'zab' that references '/node_modules/baz/zab'.
+Loading module as file / folder, candidate module location '/node_modules/baz/zab', target file types: JavaScript, JSON.
+File '/node_modules/baz/zab.js' does not exist.
+File '/node_modules/baz/zab.jsx' does not exist.
+File '/node_modules/baz/zab/index.js' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/baz/zab/index.js', result '/node_modules/baz/zab/index.js'.
+======== Module name 'baz' was successfully resolved to '/node_modules/baz/zab/index.js'. ========
diff --git a/testdata/baselines/reference/submodule/conformance/packageJsonMain_isNonRecursive.trace.json b/testdata/baselines/reference/submodule/conformance/packageJsonMain_isNonRecursive.trace.json
new file mode 100644
index 0000000000..654fc3fe5c
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/packageJsonMain_isNonRecursive.trace.json
@@ -0,0 +1,38 @@
+======== Resolving module 'foo' from '/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/package.json' does not exist.
+Loading module 'foo' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Found 'package.json' at '/node_modules/foo/package.json'.
+File '/node_modules/foo.ts' does not exist.
+File '/node_modules/foo.tsx' does not exist.
+File '/node_modules/foo.d.ts' does not exist.
+'package.json' does not have a 'typesVersions' field.
+'package.json' does not have a 'typings' field.
+'package.json' does not have a 'types' field.
+'package.json' has 'main' field 'oof' that references '/node_modules/foo/oof'.
+Loading module as file / folder, candidate module location '/node_modules/foo/oof', target file types: TypeScript, Declaration.
+File '/node_modules/foo/oof.ts' does not exist.
+File '/node_modules/foo/oof.tsx' does not exist.
+File '/node_modules/foo/oof.d.ts' does not exist.
+File '/node_modules/foo/oof/index.ts' does not exist.
+File '/node_modules/foo/oof/index.tsx' does not exist.
+File '/node_modules/foo/oof/index.d.ts' does not exist.
+File '/node_modules/foo/index.ts' does not exist.
+File '/node_modules/foo/index.tsx' does not exist.
+File '/node_modules/foo/index.d.ts' does not exist.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript, JSON.
+File '/node_modules/foo/package.json' exists according to earlier cached lookups.
+File '/node_modules/foo.js' does not exist.
+File '/node_modules/foo.jsx' does not exist.
+'package.json' has 'main' field 'oof' that references '/node_modules/foo/oof'.
+Loading module as file / folder, candidate module location '/node_modules/foo/oof', target file types: JavaScript, JSON.
+File '/node_modules/foo/oof.js' does not exist.
+File '/node_modules/foo/oof.jsx' does not exist.
+File '/node_modules/foo/oof/index.js' does not exist.
+File '/node_modules/foo/oof/index.jsx' does not exist.
+File '/node_modules/foo/index.js' does not exist.
+File '/node_modules/foo/index.jsx' does not exist.
+======== Module name 'foo' was not resolved. ========
diff --git a/testdata/baselines/reference/submodule/conformance/resolutionModeCache.trace.json b/testdata/baselines/reference/submodule/conformance/resolutionModeCache.trace.json
new file mode 100644
index 0000000000..cc9f657434
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/resolutionModeCache.trace.json
@@ -0,0 +1,38 @@
+======== Resolving module 'pkg' from '/index.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/package.json' does not exist.
+Loading module 'pkg' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Found 'package.json' at '/node_modules/pkg/package.json'.
+Entering conditional exports.
+Saw non-matching condition 'import'.
+Matched 'exports' condition 'require'.
+Using 'exports' subpath '.' with target './index.js'.
+File name '/node_modules/pkg/index.js' has a '.js' extension - stripping it.
+File '/node_modules/pkg/index.ts' does not exist.
+File '/node_modules/pkg/index.tsx' does not exist.
+File '/node_modules/pkg/index.d.ts' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolved under condition 'require'.
+Exiting conditional exports.
+Resolving real path for '/node_modules/pkg/index.d.ts', result '/node_modules/pkg/index.d.ts'.
+======== Module name 'pkg' was successfully resolved to '/node_modules/pkg/index.d.ts' with Package ID 'pkg@1.0.0'. ========
+======== Resolving module 'pkg' from '/index.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'pkg' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/node_modules/pkg/package.json' exists according to earlier cached lookups.
+Entering conditional exports.
+Matched 'exports' condition 'import'.
+Using 'exports' subpath '.' with target './index.mjs'.
+File name '/node_modules/pkg/index.mjs' has a '.mjs' extension - stripping it.
+File '/node_modules/pkg/index.mts' does not exist.
+File '/node_modules/pkg/index.d.mts' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolved under condition 'import'.
+Exiting conditional exports.
+Resolving real path for '/node_modules/pkg/index.d.mts', result '/node_modules/pkg/index.d.mts'.
+======== Module name 'pkg' was successfully resolved to '/node_modules/pkg/index.d.mts' with Package ID 'pkg@1.0.0'. ========
diff --git a/testdata/baselines/reference/submodule/conformance/resolvesWithoutExportsDiagnostic1(moduleresolution=bundler).trace.json b/testdata/baselines/reference/submodule/conformance/resolvesWithoutExportsDiagnostic1(moduleresolution=bundler).trace.json
new file mode 100644
index 0000000000..6c10883493
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/resolvesWithoutExportsDiagnostic1(moduleresolution=bundler).trace.json
@@ -0,0 +1,120 @@
+======== Resolving module 'foo' from '/index.mts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+File '/package.json' does not exist.
+Loading module 'foo' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Found 'package.json' at '/node_modules/foo/package.json'.
+Entering conditional exports.
+Matched 'exports' condition 'import'.
+Using 'exports' subpath '.' with target './index.mjs'.
+File name '/node_modules/foo/index.mjs' has a '.mjs' extension - stripping it.
+File '/node_modules/foo/index.mts' does not exist.
+File '/node_modules/foo/index.d.mts' does not exist.
+Failed to resolve under condition 'import'.
+Saw non-matching condition 'require'.
+Exiting conditional exports.
+File '/node_modules/@types/foo.d.ts' does not exist.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript, JSON.
+File '/node_modules/foo/package.json' exists according to earlier cached lookups.
+Entering conditional exports.
+Matched 'exports' condition 'import'.
+Using 'exports' subpath '.' with target './index.mjs'.
+File name '/node_modules/foo/index.mjs' has a '.mjs' extension - stripping it.
+File '/node_modules/foo/index.mjs' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolved under condition 'import'.
+Exiting conditional exports.
+Resolving real path for '/node_modules/foo/index.mjs', result '/node_modules/foo/index.mjs'.
+Resolution of non-relative name failed; trying with modern Node resolution features disabled to see if npm library needs configuration update.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'foo' from 'node_modules' folder, target file types: TypeScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/node_modules/foo/package.json' exists according to earlier cached lookups.
+File '/node_modules/foo.ts' does not exist.
+File '/node_modules/foo.tsx' does not exist.
+File '/node_modules/foo.d.ts' does not exist.
+'package.json' does not have a 'typesVersions' field.
+'package.json' does not have a 'typings' field.
+'package.json' has 'types' field 'index.d.ts' that references '/node_modules/foo/index.d.ts'.
+File '/node_modules/foo/index.d.ts' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolving real path for '/node_modules/foo/index.d.ts', result '/node_modules/foo/index.d.ts'.
+======== Module name 'foo' was successfully resolved to '/node_modules/foo/index.mjs' with Package ID 'foo@1.0.0'. ========
+======== Resolving module 'bar' from '/index.mts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'bar' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Found 'package.json' at '/node_modules/bar/package.json'.
+Entering conditional exports.
+Matched 'exports' condition 'import'.
+Using 'exports' subpath '.' with target './index.mjs'.
+File name '/node_modules/bar/index.mjs' has a '.mjs' extension - stripping it.
+File '/node_modules/bar/index.mts' does not exist.
+File '/node_modules/bar/index.d.mts' does not exist.
+Failed to resolve under condition 'import'.
+Saw non-matching condition 'require'.
+Exiting conditional exports.
+File '/node_modules/@types/bar/package.json' exists according to earlier cached lookups.
+Entering conditional exports.
+Saw non-matching condition 'require'.
+Exiting conditional exports.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript, JSON.
+File '/node_modules/bar/package.json' exists according to earlier cached lookups.
+Entering conditional exports.
+Matched 'exports' condition 'import'.
+Using 'exports' subpath '.' with target './index.mjs'.
+File name '/node_modules/bar/index.mjs' has a '.mjs' extension - stripping it.
+File '/node_modules/bar/index.mjs' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolved under condition 'import'.
+Exiting conditional exports.
+Resolving real path for '/node_modules/bar/index.mjs', result '/node_modules/bar/index.mjs'.
+Resolution of non-relative name failed; trying with modern Node resolution features disabled to see if npm library needs configuration update.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'bar' from 'node_modules' folder, target file types: TypeScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/node_modules/bar/package.json' exists according to earlier cached lookups.
+File '/node_modules/bar.ts' does not exist.
+File '/node_modules/bar.tsx' does not exist.
+File '/node_modules/bar.d.ts' does not exist.
+'package.json' does not have a 'typesVersions' field.
+'package.json' does not have a 'typings' field.
+'package.json' does not have a 'types' field.
+'package.json' has 'main' field 'index.js' that references '/node_modules/bar/index.js'.
+File name '/node_modules/bar/index.js' has a '.js' extension - stripping it.
+File '/node_modules/bar/index.ts' does not exist.
+File '/node_modules/bar/index.tsx' does not exist.
+File '/node_modules/bar/index.d.ts' does not exist.
+Loading module as file / folder, candidate module location '/node_modules/bar/index.js', target file types: TypeScript, Declaration.
+File name '/node_modules/bar/index.js' has a '.js' extension - stripping it.
+File '/node_modules/bar/index.ts' does not exist.
+File '/node_modules/bar/index.tsx' does not exist.
+File '/node_modules/bar/index.d.ts' does not exist.
+File '/node_modules/bar/index.js.ts' does not exist.
+File '/node_modules/bar/index.js.tsx' does not exist.
+File '/node_modules/bar/index.js.d.ts' does not exist.
+Directory '/node_modules/bar/index.js' does not exist, skipping all lookups in it.
+File '/node_modules/bar/index.ts' does not exist.
+File '/node_modules/bar/index.tsx' does not exist.
+File '/node_modules/bar/index.d.ts' does not exist.
+File '/node_modules/@types/bar/package.json' exists according to earlier cached lookups.
+File '/node_modules/@types/bar.d.ts' does not exist.
+'package.json' does not have a 'typings' field.
+'package.json' has 'types' field 'index.d.ts' that references '/node_modules/@types/bar/index.d.ts'.
+File '/node_modules/@types/bar/index.d.ts' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolving real path for '/node_modules/@types/bar/index.d.ts', result '/node_modules/@types/bar/index.d.ts'.
+======== Module name 'bar' was successfully resolved to '/node_modules/bar/index.mjs' with Package ID 'bar@1.0.0'. ========
+======== Resolving type reference directive 'bar', containing file '/.src/__inferred type names__.ts', root directory '/.src/node_modules/@types,/node_modules/@types'. ========
+Resolving with primary search path '/.src/node_modules/@types, /node_modules/@types'.
+Directory '/.src/node_modules/@types' does not exist, skipping all lookups in it.
+Found 'package.json' at '/node_modules/@types/bar/package.json'.
+'package.json' does not have a 'typesVersions' field.
+'package.json' does not have a 'typings' field.
+'package.json' has 'types' field 'index.d.ts' that references '/node_modules/@types/bar/index.d.ts'.
+File '/node_modules/@types/bar/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/@types/bar/index.d.ts', result '/node_modules/@types/bar/index.d.ts'.
+======== Type reference directive 'bar' was successfully resolved to '/node_modules/@types/bar/index.d.ts', primary: true. ========
diff --git a/testdata/baselines/reference/submodule/conformance/resolvesWithoutExportsDiagnostic1(moduleresolution=node16).trace.json b/testdata/baselines/reference/submodule/conformance/resolvesWithoutExportsDiagnostic1(moduleresolution=node16).trace.json
new file mode 100644
index 0000000000..b045c091db
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/resolvesWithoutExportsDiagnostic1(moduleresolution=node16).trace.json
@@ -0,0 +1,109 @@
+======== Resolving module 'foo' from '/index.mts'. ========
+Explicitly specified module resolution kind: 'Node16'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/package.json' does not exist.
+Loading module 'foo' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Found 'package.json' at '/node_modules/foo/package.json'.
+Entering conditional exports.
+Matched 'exports' condition 'import'.
+Using 'exports' subpath '.' with target './index.mjs'.
+File name '/node_modules/foo/index.mjs' has a '.mjs' extension - stripping it.
+File '/node_modules/foo/index.mts' does not exist.
+File '/node_modules/foo/index.d.mts' does not exist.
+Failed to resolve under condition 'import'.
+Saw non-matching condition 'require'.
+Exiting conditional exports.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript.
+File '/node_modules/foo/package.json' exists according to earlier cached lookups.
+Entering conditional exports.
+Matched 'exports' condition 'import'.
+Using 'exports' subpath '.' with target './index.mjs'.
+File name '/node_modules/foo/index.mjs' has a '.mjs' extension - stripping it.
+File '/node_modules/foo/index.mjs' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolved under condition 'import'.
+Exiting conditional exports.
+Resolving real path for '/node_modules/foo/index.mjs', result '/node_modules/foo/index.mjs'.
+Resolution of non-relative name failed; trying with modern Node resolution features disabled to see if npm library needs configuration update.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'foo' from 'node_modules' folder, target file types: TypeScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/node_modules/foo/package.json' exists according to earlier cached lookups.
+'package.json' does not have a 'typesVersions' field.
+'package.json' does not have a 'typings' field.
+'package.json' has 'types' field 'index.d.ts' that references '/node_modules/foo/index.d.ts'.
+File '/node_modules/foo/index.d.ts' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolving real path for '/node_modules/foo/index.d.ts', result '/node_modules/foo/index.d.ts'.
+======== Module name 'foo' was successfully resolved to '/node_modules/foo/index.mjs' with Package ID 'foo@1.0.0'. ========
+======== Resolving module 'bar' from '/index.mts'. ========
+Explicitly specified module resolution kind: 'Node16'.
+Resolving in ESM mode with conditions 'import', 'types', 'node'.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'bar' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Found 'package.json' at '/node_modules/bar/package.json'.
+Entering conditional exports.
+Matched 'exports' condition 'import'.
+Using 'exports' subpath '.' with target './index.mjs'.
+File name '/node_modules/bar/index.mjs' has a '.mjs' extension - stripping it.
+File '/node_modules/bar/index.mts' does not exist.
+File '/node_modules/bar/index.d.mts' does not exist.
+Failed to resolve under condition 'import'.
+Saw non-matching condition 'require'.
+Exiting conditional exports.
+File '/node_modules/@types/bar/package.json' exists according to earlier cached lookups.
+Entering conditional exports.
+Saw non-matching condition 'require'.
+Exiting conditional exports.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript.
+File '/node_modules/bar/package.json' exists according to earlier cached lookups.
+Entering conditional exports.
+Matched 'exports' condition 'import'.
+Using 'exports' subpath '.' with target './index.mjs'.
+File name '/node_modules/bar/index.mjs' has a '.mjs' extension - stripping it.
+File '/node_modules/bar/index.mjs' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolved under condition 'import'.
+Exiting conditional exports.
+Resolving real path for '/node_modules/bar/index.mjs', result '/node_modules/bar/index.mjs'.
+Resolution of non-relative name failed; trying with modern Node resolution features disabled to see if npm library needs configuration update.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'bar' from 'node_modules' folder, target file types: TypeScript, Declaration.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/node_modules/bar/package.json' exists according to earlier cached lookups.
+'package.json' does not have a 'typesVersions' field.
+'package.json' does not have a 'typings' field.
+'package.json' does not have a 'types' field.
+'package.json' has 'main' field 'index.js' that references '/node_modules/bar/index.js'.
+File name '/node_modules/bar/index.js' has a '.js' extension - stripping it.
+File '/node_modules/bar/index.ts' does not exist.
+File '/node_modules/bar/index.tsx' does not exist.
+File '/node_modules/bar/index.d.ts' does not exist.
+Loading module as file / folder, candidate module location '/node_modules/bar/index.js', target file types: TypeScript, Declaration.
+File name '/node_modules/bar/index.js' has a '.js' extension - stripping it.
+File '/node_modules/bar/index.ts' does not exist.
+File '/node_modules/bar/index.tsx' does not exist.
+File '/node_modules/bar/index.d.ts' does not exist.
+File '/node_modules/bar/index.js.ts' does not exist.
+File '/node_modules/bar/index.js.tsx' does not exist.
+File '/node_modules/bar/index.js.d.ts' does not exist.
+Directory '/node_modules/bar/index.js' does not exist, skipping all lookups in it.
+File '/node_modules/@types/bar/package.json' exists according to earlier cached lookups.
+'package.json' does not have a 'typings' field.
+'package.json' has 'types' field 'index.d.ts' that references '/node_modules/@types/bar/index.d.ts'.
+File '/node_modules/@types/bar/index.d.ts' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolving real path for '/node_modules/@types/bar/index.d.ts', result '/node_modules/@types/bar/index.d.ts'.
+======== Module name 'bar' was successfully resolved to '/node_modules/bar/index.mjs' with Package ID 'bar@1.0.0'. ========
+======== Resolving type reference directive 'bar', containing file '/.src/__inferred type names__.ts', root directory '/.src/node_modules/@types,/node_modules/@types'. ========
+Resolving with primary search path '/.src/node_modules/@types, /node_modules/@types'.
+Directory '/.src/node_modules/@types' does not exist, skipping all lookups in it.
+Found 'package.json' at '/node_modules/@types/bar/package.json'.
+'package.json' does not have a 'typesVersions' field.
+'package.json' does not have a 'typings' field.
+'package.json' has 'types' field 'index.d.ts' that references '/node_modules/@types/bar/index.d.ts'.
+File '/node_modules/@types/bar/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/@types/bar/index.d.ts', result '/node_modules/@types/bar/index.d.ts'.
+======== Type reference directive 'bar' was successfully resolved to '/node_modules/@types/bar/index.d.ts', primary: true. ========
diff --git a/testdata/baselines/reference/submodule/conformance/scopedPackages.trace.json b/testdata/baselines/reference/submodule/conformance/scopedPackages.trace.json
new file mode 100644
index 0000000000..52e7c20137
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/scopedPackages.trace.json
@@ -0,0 +1,45 @@
+======== Resolving module '@cow/boy' from '/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module '@cow/boy' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/node_modules/@cow/boy/package.json' does not exist.
+File '/node_modules/@cow/boy.ts' does not exist.
+File '/node_modules/@cow/boy.tsx' does not exist.
+File '/node_modules/@cow/boy.d.ts' does not exist.
+File '/node_modules/@cow/boy/index.ts' does not exist.
+File '/node_modules/@cow/boy/index.tsx' does not exist.
+File '/node_modules/@cow/boy/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/@cow/boy/index.d.ts', result '/node_modules/@cow/boy/index.d.ts'.
+======== Module name '@cow/boy' was successfully resolved to '/node_modules/@cow/boy/index.d.ts'. ========
+======== Resolving module '@be/bop' from '/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module '@be/bop' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Scoped package detected, looking in 'be__bop'
+File '/node_modules/@types/be__bop/package.json' does not exist according to earlier cached lookups.
+File '/node_modules/@types/be__bop.d.ts' does not exist.
+File '/node_modules/@types/be__bop/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/@types/be__bop/index.d.ts', result '/node_modules/@types/be__bop/index.d.ts'.
+======== Module name '@be/bop' was successfully resolved to '/node_modules/@types/be__bop/index.d.ts'. ========
+======== Resolving module '@be/bop/e/z' from '/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module '@be/bop/e/z' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Scoped package detected, looking in 'be__bop/e/z'
+File '/node_modules/@types/be__bop/package.json' does not exist according to earlier cached lookups.
+File '/node_modules/@types/be__bop/e/z.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/@types/be__bop/e/z.d.ts', result '/node_modules/@types/be__bop/e/z.d.ts'.
+======== Module name '@be/bop/e/z' was successfully resolved to '/node_modules/@types/be__bop/e/z.d.ts'. ========
+======== Resolving type reference directive 'be__bop', containing file '/.src/__inferred type names__.ts', root directory '/.src/node_modules/@types,/node_modules/@types'. ========
+Resolving with primary search path '/.src/node_modules/@types, /node_modules/@types'.
+Directory '/.src/node_modules/@types' does not exist, skipping all lookups in it.
+File '/node_modules/@types/be__bop/package.json' does not exist.
+File '/node_modules/@types/be__bop/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/@types/be__bop/index.d.ts', result '/node_modules/@types/be__bop/index.d.ts'.
+======== Type reference directive 'be__bop' was successfully resolved to '/node_modules/@types/be__bop/index.d.ts', primary: true. ========
diff --git a/testdata/baselines/reference/submodule/conformance/scopedPackagesClassic.trace.json b/testdata/baselines/reference/submodule/conformance/scopedPackagesClassic.trace.json
new file mode 100644
index 0000000000..ad6915bbc7
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/scopedPackagesClassic.trace.json
@@ -0,0 +1,19 @@
+======== Resolving module '@see/saw' from '/a.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module '@see/saw' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Scoped package detected, looking in 'see__saw'
+File '/node_modules/@types/see__saw/package.json' does not exist according to earlier cached lookups.
+File '/node_modules/@types/see__saw.d.ts' does not exist.
+File '/node_modules/@types/see__saw/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/@types/see__saw/index.d.ts', result '/node_modules/@types/see__saw/index.d.ts'.
+======== Module name '@see/saw' was successfully resolved to '/node_modules/@types/see__saw/index.d.ts'. ========
+======== Resolving type reference directive 'see__saw', containing file '/.src/__inferred type names__.ts', root directory '/.src/node_modules/@types,/node_modules/@types'. ========
+Resolving with primary search path '/.src/node_modules/@types, /node_modules/@types'.
+Directory '/.src/node_modules/@types' does not exist, skipping all lookups in it.
+File '/node_modules/@types/see__saw/package.json' does not exist.
+File '/node_modules/@types/see__saw/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/@types/see__saw/index.d.ts', result '/node_modules/@types/see__saw/index.d.ts'.
+======== Type reference directive 'see__saw' was successfully resolved to '/node_modules/@types/see__saw/index.d.ts', primary: true. ========
diff --git a/testdata/baselines/reference/submodule/conformance/selfNameModuleAugmentation.trace.json b/testdata/baselines/reference/submodule/conformance/selfNameModuleAugmentation.trace.json
new file mode 100644
index 0000000000..9999e1b66b
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/selfNameModuleAugmentation.trace.json
@@ -0,0 +1,50 @@
+======== Resolving module 'acorn-walk' from '/node_modules/acorn-walk/dist/walk.d.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+File '/node_modules/acorn-walk/dist/package.json' does not exist according to earlier cached lookups.
+File '/node_modules/acorn-walk/package.json' exists according to earlier cached lookups.
+Entering conditional exports.
+Matched 'exports' condition 'import'.
+Using 'exports' subpath '.' with target './dist/walk.mjs'.
+File name '/node_modules/acorn-walk/dist/walk.mjs' has a '.mjs' extension - stripping it.
+File '/node_modules/acorn-walk/dist/walk.mts' does not exist.
+File '/node_modules/acorn-walk/dist/walk.d.mts' does not exist.
+Failed to resolve under condition 'import'.
+Saw non-matching condition 'require'.
+Matched 'exports' condition 'default'.
+Using 'exports' subpath '.' with target './dist/walk.js'.
+File name '/node_modules/acorn-walk/dist/walk.js' has a '.js' extension - stripping it.
+File '/node_modules/acorn-walk/dist/walk.ts' does not exist.
+File '/node_modules/acorn-walk/dist/walk.tsx' does not exist.
+File '/node_modules/acorn-walk/dist/walk.d.ts' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolved under condition 'default'.
+Exiting conditional exports.
+Resolving real path for '/node_modules/acorn-walk/dist/walk.d.ts', result '/node_modules/acorn-walk/dist/walk.d.ts'.
+======== Module name 'acorn-walk' was successfully resolved to '/node_modules/acorn-walk/dist/walk.d.ts' with Package ID 'acorn-walk@8.2.0'. ========
+======== Resolving module 'acorn-walk' from '/index.ts'. ========
+Explicitly specified module resolution kind: 'Bundler'.
+Resolving in CJS mode with conditions 'import', 'types'.
+File '/package.json' does not exist.
+Loading module 'acorn-walk' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Found 'package.json' at '/node_modules/acorn-walk/package.json'.
+Entering conditional exports.
+Matched 'exports' condition 'import'.
+Using 'exports' subpath '.' with target './dist/walk.mjs'.
+File name '/node_modules/acorn-walk/dist/walk.mjs' has a '.mjs' extension - stripping it.
+File '/node_modules/acorn-walk/dist/walk.mts' does not exist.
+File '/node_modules/acorn-walk/dist/walk.d.mts' does not exist.
+Failed to resolve under condition 'import'.
+Saw non-matching condition 'require'.
+Matched 'exports' condition 'default'.
+Using 'exports' subpath '.' with target './dist/walk.js'.
+File name '/node_modules/acorn-walk/dist/walk.js' has a '.js' extension - stripping it.
+File '/node_modules/acorn-walk/dist/walk.ts' does not exist.
+File '/node_modules/acorn-walk/dist/walk.tsx' does not exist.
+File '/node_modules/acorn-walk/dist/walk.d.ts' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolved under condition 'default'.
+Exiting conditional exports.
+Resolving real path for '/node_modules/acorn-walk/dist/walk.d.ts', result '/node_modules/acorn-walk/dist/walk.d.ts'.
+======== Module name 'acorn-walk' was successfully resolved to '/node_modules/acorn-walk/dist/walk.d.ts' with Package ID 'acorn-walk@8.2.0'. ========
diff --git a/testdata/baselines/reference/submodule/conformance/typesVersions.ambientModules.trace.json b/testdata/baselines/reference/submodule/conformance/typesVersions.ambientModules.trace.json
new file mode 100644
index 0000000000..387ace26b1
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/typesVersions.ambientModules.trace.json
@@ -0,0 +1,71 @@
+======== Resolving module 'ext' from '/.src/main.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/.src/package.json' does not exist.
+File '/package.json' does not exist.
+Loading module 'ext' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Found 'package.json' at '/.src/node_modules/ext/package.json'.
+File '/.src/node_modules/ext.ts' does not exist.
+File '/.src/node_modules/ext.tsx' does not exist.
+File '/.src/node_modules/ext.d.ts' does not exist.
+'package.json' has a 'typesVersions' field with version-specific path mappings.
+'package.json' does not have a 'typings' field.
+'package.json' has 'types' field 'index' that references '/.src/node_modules/ext/index'.
+'package.json' has a 'typesVersions' entry '>=3.1.0-0' that matches compiler version '7.0.0-dev', looking for a pattern to match module name 'index'.
+Module name 'index', matched pattern '*'.
+Trying substitution 'ts3.1/*', candidate module location: 'ts3.1/index'.
+Loading module as file / folder, candidate module location '/.src/node_modules/ext/ts3.1/index', target file types: TypeScript, Declaration.
+File '/.src/node_modules/ext/ts3.1/index.ts' does not exist.
+File '/.src/node_modules/ext/ts3.1/index.tsx' does not exist.
+File '/.src/node_modules/ext/ts3.1/index.d.ts' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolving real path for '/.src/node_modules/ext/ts3.1/index.d.ts', result '/.src/node_modules/ext/ts3.1/index.d.ts'.
+======== Module name 'ext' was successfully resolved to '/.src/node_modules/ext/ts3.1/index.d.ts' with Package ID 'ext@1.0.0'. ========
+======== Resolving module 'ext/other' from '/.src/main.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/.src/package.json' does not exist according to earlier cached lookups.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'ext/other' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/.src/node_modules/ext/package.json' exists according to earlier cached lookups.
+'package.json' has a 'typesVersions' entry '>=3.1.0-0' that matches compiler version '7.0.0-dev', looking for a pattern to match module name 'other'.
+Module name 'other', matched pattern '*'.
+Trying substitution 'ts3.1/*', candidate module location: 'ts3.1/other'.
+File '/.src/node_modules/ext/ts3.1/other.ts' does not exist.
+File '/.src/node_modules/ext/ts3.1/other.tsx' does not exist.
+File '/.src/node_modules/ext/ts3.1/other.d.ts' does not exist.
+'package.json' has a 'typesVersions' entry '>=3.1.0-0' that matches compiler version '7.0.0-dev', looking for a pattern to match module name 'index'.
+Module name 'index', matched pattern '*'.
+Trying substitution 'ts3.1/*', candidate module location: 'ts3.1/index'.
+Loading module as file / folder, candidate module location '/.src/node_modules/ext/ts3.1/other/ts3.1/index', target file types: TypeScript, Declaration.
+File '/.src/node_modules/ext/other.ts' does not exist.
+File '/.src/node_modules/ext/other.tsx' does not exist.
+File '/.src/node_modules/ext/other.d.ts' does not exist.
+'package.json' has a 'typesVersions' entry '>=3.1.0-0' that matches compiler version '7.0.0-dev', looking for a pattern to match module name 'index'.
+Module name 'index', matched pattern '*'.
+Trying substitution 'ts3.1/*', candidate module location: 'ts3.1/index'.
+Loading module as file / folder, candidate module location '/.src/node_modules/ext/other/ts3.1/index', target file types: TypeScript, Declaration.
+Directory '/.src/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript, JSON.
+File '/.src/node_modules/ext/package.json' exists according to earlier cached lookups.
+'package.json' has a 'typesVersions' entry '>=3.1.0-0' that matches compiler version '7.0.0-dev', looking for a pattern to match module name 'other'.
+Module name 'other', matched pattern '*'.
+Trying substitution 'ts3.1/*', candidate module location: 'ts3.1/other'.
+File '/.src/node_modules/ext/ts3.1/other.js' does not exist.
+File '/.src/node_modules/ext/ts3.1/other.jsx' does not exist.
+'package.json' has a 'typesVersions' entry '>=3.1.0-0' that matches compiler version '7.0.0-dev', looking for a pattern to match module name 'index'.
+Module name 'index', matched pattern '*'.
+Trying substitution 'ts3.1/*', candidate module location: 'ts3.1/index'.
+Loading module as file / folder, candidate module location '/.src/node_modules/ext/ts3.1/other/ts3.1/index', target file types: JavaScript, JSON.
+File '/.src/node_modules/ext/other.js' does not exist.
+File '/.src/node_modules/ext/other.jsx' does not exist.
+'package.json' has a 'typesVersions' entry '>=3.1.0-0' that matches compiler version '7.0.0-dev', looking for a pattern to match module name 'index'.
+Module name 'index', matched pattern '*'.
+Trying substitution 'ts3.1/*', candidate module location: 'ts3.1/index'.
+Loading module as file / folder, candidate module location '/.src/node_modules/ext/other/ts3.1/index', target file types: JavaScript, JSON.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+======== Module name 'ext/other' was not resolved. ========
diff --git a/testdata/baselines/reference/submodule/conformance/typesVersions.emptyTypes.trace.json b/testdata/baselines/reference/submodule/conformance/typesVersions.emptyTypes.trace.json
new file mode 100644
index 0000000000..f7084a863a
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/typesVersions.emptyTypes.trace.json
@@ -0,0 +1,15 @@
+======== Resolving module 'a' from '/b/user.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/b/package.json' does not exist.
+File '/package.json' does not exist.
+Loading module 'a' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Directory '/b/node_modules' does not exist, skipping all lookups in it.
+Directory '/b/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript, JSON.
+Directory '/b/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+======== Module name 'a' was not resolved. ========
diff --git a/testdata/baselines/reference/submodule/conformance/typesVersions.justIndex.trace.json b/testdata/baselines/reference/submodule/conformance/typesVersions.justIndex.trace.json
new file mode 100644
index 0000000000..f7084a863a
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/typesVersions.justIndex.trace.json
@@ -0,0 +1,15 @@
+======== Resolving module 'a' from '/b/user.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/b/package.json' does not exist.
+File '/package.json' does not exist.
+Loading module 'a' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Directory '/b/node_modules' does not exist, skipping all lookups in it.
+Directory '/b/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript, JSON.
+Directory '/b/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+======== Module name 'a' was not resolved. ========
diff --git a/testdata/baselines/reference/submodule/conformance/typesVersions.multiFile.trace.json b/testdata/baselines/reference/submodule/conformance/typesVersions.multiFile.trace.json
new file mode 100644
index 0000000000..43b3446387
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/typesVersions.multiFile.trace.json
@@ -0,0 +1,41 @@
+======== Resolving module 'ext' from '/.src/main.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/.src/package.json' does not exist.
+File '/package.json' does not exist.
+Loading module 'ext' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Found 'package.json' at '/.src/node_modules/ext/package.json'.
+File '/.src/node_modules/ext.ts' does not exist.
+File '/.src/node_modules/ext.tsx' does not exist.
+File '/.src/node_modules/ext.d.ts' does not exist.
+'package.json' has a 'typesVersions' field with version-specific path mappings.
+'package.json' does not have a 'typings' field.
+'package.json' has 'types' field 'index' that references '/.src/node_modules/ext/index'.
+'package.json' has a 'typesVersions' entry '>=3.1.0-0' that matches compiler version '7.0.0-dev', looking for a pattern to match module name 'index'.
+Module name 'index', matched pattern '*'.
+Trying substitution 'ts3.1/*', candidate module location: 'ts3.1/index'.
+Loading module as file / folder, candidate module location '/.src/node_modules/ext/ts3.1/index', target file types: TypeScript, Declaration.
+File '/.src/node_modules/ext/ts3.1/index.ts' does not exist.
+File '/.src/node_modules/ext/ts3.1/index.tsx' does not exist.
+File '/.src/node_modules/ext/ts3.1/index.d.ts' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolving real path for '/.src/node_modules/ext/ts3.1/index.d.ts', result '/.src/node_modules/ext/ts3.1/index.d.ts'.
+======== Module name 'ext' was successfully resolved to '/.src/node_modules/ext/ts3.1/index.d.ts' with Package ID 'ext@1.0.0'. ========
+======== Resolving module 'ext/other' from '/.src/main.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/.src/package.json' does not exist according to earlier cached lookups.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'ext/other' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/.src/node_modules/ext/package.json' exists according to earlier cached lookups.
+'package.json' has a 'typesVersions' entry '>=3.1.0-0' that matches compiler version '7.0.0-dev', looking for a pattern to match module name 'other'.
+Module name 'other', matched pattern '*'.
+Trying substitution 'ts3.1/*', candidate module location: 'ts3.1/other'.
+File '/.src/node_modules/ext/ts3.1/other.ts' does not exist.
+File '/.src/node_modules/ext/ts3.1/other.tsx' does not exist.
+File '/.src/node_modules/ext/ts3.1/other.d.ts' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolving real path for '/.src/node_modules/ext/ts3.1/other.d.ts', result '/.src/node_modules/ext/ts3.1/other.d.ts'.
+======== Module name 'ext/other' was successfully resolved to '/.src/node_modules/ext/ts3.1/other.d.ts' with Package ID 'ext@1.0.0'. ========
diff --git a/testdata/baselines/reference/submodule/conformance/typesVersionsDeclarationEmit.ambient.trace.json b/testdata/baselines/reference/submodule/conformance/typesVersionsDeclarationEmit.ambient.trace.json
new file mode 100644
index 0000000000..387ace26b1
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/typesVersionsDeclarationEmit.ambient.trace.json
@@ -0,0 +1,71 @@
+======== Resolving module 'ext' from '/.src/main.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/.src/package.json' does not exist.
+File '/package.json' does not exist.
+Loading module 'ext' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Found 'package.json' at '/.src/node_modules/ext/package.json'.
+File '/.src/node_modules/ext.ts' does not exist.
+File '/.src/node_modules/ext.tsx' does not exist.
+File '/.src/node_modules/ext.d.ts' does not exist.
+'package.json' has a 'typesVersions' field with version-specific path mappings.
+'package.json' does not have a 'typings' field.
+'package.json' has 'types' field 'index' that references '/.src/node_modules/ext/index'.
+'package.json' has a 'typesVersions' entry '>=3.1.0-0' that matches compiler version '7.0.0-dev', looking for a pattern to match module name 'index'.
+Module name 'index', matched pattern '*'.
+Trying substitution 'ts3.1/*', candidate module location: 'ts3.1/index'.
+Loading module as file / folder, candidate module location '/.src/node_modules/ext/ts3.1/index', target file types: TypeScript, Declaration.
+File '/.src/node_modules/ext/ts3.1/index.ts' does not exist.
+File '/.src/node_modules/ext/ts3.1/index.tsx' does not exist.
+File '/.src/node_modules/ext/ts3.1/index.d.ts' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolving real path for '/.src/node_modules/ext/ts3.1/index.d.ts', result '/.src/node_modules/ext/ts3.1/index.d.ts'.
+======== Module name 'ext' was successfully resolved to '/.src/node_modules/ext/ts3.1/index.d.ts' with Package ID 'ext@1.0.0'. ========
+======== Resolving module 'ext/other' from '/.src/main.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/.src/package.json' does not exist according to earlier cached lookups.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'ext/other' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/.src/node_modules/ext/package.json' exists according to earlier cached lookups.
+'package.json' has a 'typesVersions' entry '>=3.1.0-0' that matches compiler version '7.0.0-dev', looking for a pattern to match module name 'other'.
+Module name 'other', matched pattern '*'.
+Trying substitution 'ts3.1/*', candidate module location: 'ts3.1/other'.
+File '/.src/node_modules/ext/ts3.1/other.ts' does not exist.
+File '/.src/node_modules/ext/ts3.1/other.tsx' does not exist.
+File '/.src/node_modules/ext/ts3.1/other.d.ts' does not exist.
+'package.json' has a 'typesVersions' entry '>=3.1.0-0' that matches compiler version '7.0.0-dev', looking for a pattern to match module name 'index'.
+Module name 'index', matched pattern '*'.
+Trying substitution 'ts3.1/*', candidate module location: 'ts3.1/index'.
+Loading module as file / folder, candidate module location '/.src/node_modules/ext/ts3.1/other/ts3.1/index', target file types: TypeScript, Declaration.
+File '/.src/node_modules/ext/other.ts' does not exist.
+File '/.src/node_modules/ext/other.tsx' does not exist.
+File '/.src/node_modules/ext/other.d.ts' does not exist.
+'package.json' has a 'typesVersions' entry '>=3.1.0-0' that matches compiler version '7.0.0-dev', looking for a pattern to match module name 'index'.
+Module name 'index', matched pattern '*'.
+Trying substitution 'ts3.1/*', candidate module location: 'ts3.1/index'.
+Loading module as file / folder, candidate module location '/.src/node_modules/ext/other/ts3.1/index', target file types: TypeScript, Declaration.
+Directory '/.src/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript, JSON.
+File '/.src/node_modules/ext/package.json' exists according to earlier cached lookups.
+'package.json' has a 'typesVersions' entry '>=3.1.0-0' that matches compiler version '7.0.0-dev', looking for a pattern to match module name 'other'.
+Module name 'other', matched pattern '*'.
+Trying substitution 'ts3.1/*', candidate module location: 'ts3.1/other'.
+File '/.src/node_modules/ext/ts3.1/other.js' does not exist.
+File '/.src/node_modules/ext/ts3.1/other.jsx' does not exist.
+'package.json' has a 'typesVersions' entry '>=3.1.0-0' that matches compiler version '7.0.0-dev', looking for a pattern to match module name 'index'.
+Module name 'index', matched pattern '*'.
+Trying substitution 'ts3.1/*', candidate module location: 'ts3.1/index'.
+Loading module as file / folder, candidate module location '/.src/node_modules/ext/ts3.1/other/ts3.1/index', target file types: JavaScript, JSON.
+File '/.src/node_modules/ext/other.js' does not exist.
+File '/.src/node_modules/ext/other.jsx' does not exist.
+'package.json' has a 'typesVersions' entry '>=3.1.0-0' that matches compiler version '7.0.0-dev', looking for a pattern to match module name 'index'.
+Module name 'index', matched pattern '*'.
+Trying substitution 'ts3.1/*', candidate module location: 'ts3.1/index'.
+Loading module as file / folder, candidate module location '/.src/node_modules/ext/other/ts3.1/index', target file types: JavaScript, JSON.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+======== Module name 'ext/other' was not resolved. ========
diff --git a/testdata/baselines/reference/submodule/conformance/typesVersionsDeclarationEmit.multiFile.trace.json b/testdata/baselines/reference/submodule/conformance/typesVersionsDeclarationEmit.multiFile.trace.json
new file mode 100644
index 0000000000..43b3446387
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/typesVersionsDeclarationEmit.multiFile.trace.json
@@ -0,0 +1,41 @@
+======== Resolving module 'ext' from '/.src/main.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/.src/package.json' does not exist.
+File '/package.json' does not exist.
+Loading module 'ext' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Found 'package.json' at '/.src/node_modules/ext/package.json'.
+File '/.src/node_modules/ext.ts' does not exist.
+File '/.src/node_modules/ext.tsx' does not exist.
+File '/.src/node_modules/ext.d.ts' does not exist.
+'package.json' has a 'typesVersions' field with version-specific path mappings.
+'package.json' does not have a 'typings' field.
+'package.json' has 'types' field 'index' that references '/.src/node_modules/ext/index'.
+'package.json' has a 'typesVersions' entry '>=3.1.0-0' that matches compiler version '7.0.0-dev', looking for a pattern to match module name 'index'.
+Module name 'index', matched pattern '*'.
+Trying substitution 'ts3.1/*', candidate module location: 'ts3.1/index'.
+Loading module as file / folder, candidate module location '/.src/node_modules/ext/ts3.1/index', target file types: TypeScript, Declaration.
+File '/.src/node_modules/ext/ts3.1/index.ts' does not exist.
+File '/.src/node_modules/ext/ts3.1/index.tsx' does not exist.
+File '/.src/node_modules/ext/ts3.1/index.d.ts' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolving real path for '/.src/node_modules/ext/ts3.1/index.d.ts', result '/.src/node_modules/ext/ts3.1/index.d.ts'.
+======== Module name 'ext' was successfully resolved to '/.src/node_modules/ext/ts3.1/index.d.ts' with Package ID 'ext@1.0.0'. ========
+======== Resolving module 'ext/other' from '/.src/main.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/.src/package.json' does not exist according to earlier cached lookups.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'ext/other' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/.src/node_modules/ext/package.json' exists according to earlier cached lookups.
+'package.json' has a 'typesVersions' entry '>=3.1.0-0' that matches compiler version '7.0.0-dev', looking for a pattern to match module name 'other'.
+Module name 'other', matched pattern '*'.
+Trying substitution 'ts3.1/*', candidate module location: 'ts3.1/other'.
+File '/.src/node_modules/ext/ts3.1/other.ts' does not exist.
+File '/.src/node_modules/ext/ts3.1/other.tsx' does not exist.
+File '/.src/node_modules/ext/ts3.1/other.d.ts' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolving real path for '/.src/node_modules/ext/ts3.1/other.d.ts', result '/.src/node_modules/ext/ts3.1/other.d.ts'.
+======== Module name 'ext/other' was successfully resolved to '/.src/node_modules/ext/ts3.1/other.d.ts' with Package ID 'ext@1.0.0'. ========
diff --git a/testdata/baselines/reference/submodule/conformance/typesVersionsDeclarationEmit.multiFileBackReferenceToSelf.trace.json b/testdata/baselines/reference/submodule/conformance/typesVersionsDeclarationEmit.multiFileBackReferenceToSelf.trace.json
new file mode 100644
index 0000000000..1a6647f1f6
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/typesVersionsDeclarationEmit.multiFileBackReferenceToSelf.trace.json
@@ -0,0 +1,66 @@
+======== Resolving module 'ext' from '/.src/main.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/.src/package.json' does not exist.
+File '/package.json' does not exist.
+Loading module 'ext' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Found 'package.json' at '/.src/node_modules/ext/package.json'.
+File '/.src/node_modules/ext.ts' does not exist.
+File '/.src/node_modules/ext.tsx' does not exist.
+File '/.src/node_modules/ext.d.ts' does not exist.
+'package.json' has a 'typesVersions' field with version-specific path mappings.
+'package.json' does not have a 'typings' field.
+'package.json' has 'types' field 'index' that references '/.src/node_modules/ext/index'.
+'package.json' has a 'typesVersions' entry '>=3.1.0-0' that matches compiler version '7.0.0-dev', looking for a pattern to match module name 'index'.
+Module name 'index', matched pattern '*'.
+Trying substitution 'ts3.1/*', candidate module location: 'ts3.1/index'.
+Loading module as file / folder, candidate module location '/.src/node_modules/ext/ts3.1/index', target file types: TypeScript, Declaration.
+File '/.src/node_modules/ext/ts3.1/index.ts' does not exist.
+File '/.src/node_modules/ext/ts3.1/index.tsx' does not exist.
+File '/.src/node_modules/ext/ts3.1/index.d.ts' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolving real path for '/.src/node_modules/ext/ts3.1/index.d.ts', result '/.src/node_modules/ext/ts3.1/index.d.ts'.
+======== Module name 'ext' was successfully resolved to '/.src/node_modules/ext/ts3.1/index.d.ts' with Package ID 'ext@1.0.0'. ========
+======== Resolving module 'ext/other' from '/.src/main.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/.src/package.json' does not exist according to earlier cached lookups.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'ext/other' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/.src/node_modules/ext/package.json' exists according to earlier cached lookups.
+'package.json' has a 'typesVersions' entry '>=3.1.0-0' that matches compiler version '7.0.0-dev', looking for a pattern to match module name 'other'.
+Module name 'other', matched pattern '*'.
+Trying substitution 'ts3.1/*', candidate module location: 'ts3.1/other'.
+File '/.src/node_modules/ext/ts3.1/other.ts' does not exist.
+File '/.src/node_modules/ext/ts3.1/other.tsx' does not exist.
+File '/.src/node_modules/ext/ts3.1/other.d.ts' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolving real path for '/.src/node_modules/ext/ts3.1/other.d.ts', result '/.src/node_modules/ext/ts3.1/other.d.ts'.
+======== Module name 'ext/other' was successfully resolved to '/.src/node_modules/ext/ts3.1/other.d.ts' with Package ID 'ext@1.0.0'. ========
+======== Resolving module '../' from '/.src/node_modules/ext/ts3.1/index.d.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+Loading module as file / folder, candidate module location '/.src/node_modules/ext/', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/.src/node_modules/ext/package.json' exists according to earlier cached lookups.
+'package.json' does not have a 'typings' field.
+'package.json' has 'types' field 'index' that references '/.src/node_modules/ext/index'.
+'package.json' has a 'typesVersions' entry '>=3.1.0-0' that matches compiler version '7.0.0-dev', looking for a pattern to match module name 'index'.
+Module name 'index', matched pattern '*'.
+Trying substitution 'ts3.1/*', candidate module location: 'ts3.1/index'.
+Loading module as file / folder, candidate module location '/.src/node_modules/ext/ts3.1/index', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/.src/node_modules/ext/ts3.1/index.ts' does not exist.
+File '/.src/node_modules/ext/ts3.1/index.tsx' does not exist.
+File '/.src/node_modules/ext/ts3.1/index.d.ts' exists - use it as a name resolution result.
+======== Module name '../' was successfully resolved to '/.src/node_modules/ext/ts3.1/index.d.ts'. ========
+======== Resolving module '../other' from '/.src/node_modules/ext/ts3.1/other.d.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+Loading module as file / folder, candidate module location '/.src/node_modules/ext/other', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/.src/node_modules/ext/other.ts' does not exist.
+File '/.src/node_modules/ext/other.tsx' does not exist.
+File '/.src/node_modules/ext/other.d.ts' exists - use it as a name resolution result.
+File '/.src/node_modules/ext/package.json' exists according to earlier cached lookups.
+'package.json' does not have a 'peerDependencies' field.
+======== Module name '../other' was successfully resolved to '/.src/node_modules/ext/other.d.ts' with Package ID 'ext@1.0.0'. ========
diff --git a/testdata/baselines/reference/submodule/conformance/typesVersionsDeclarationEmit.multiFileBackReferenceToUnmapped.trace.json b/testdata/baselines/reference/submodule/conformance/typesVersionsDeclarationEmit.multiFileBackReferenceToUnmapped.trace.json
new file mode 100644
index 0000000000..acbcde0cbb
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/typesVersionsDeclarationEmit.multiFileBackReferenceToUnmapped.trace.json
@@ -0,0 +1,49 @@
+======== Resolving module 'ext' from '/.src/main.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/.src/package.json' does not exist.
+File '/package.json' does not exist.
+Loading module 'ext' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Found 'package.json' at '/.src/node_modules/ext/package.json'.
+File '/.src/node_modules/ext.ts' does not exist.
+File '/.src/node_modules/ext.tsx' does not exist.
+File '/.src/node_modules/ext.d.ts' does not exist.
+'package.json' has a 'typesVersions' field with version-specific path mappings.
+'package.json' does not have a 'typings' field.
+'package.json' has 'types' field 'index' that references '/.src/node_modules/ext/index'.
+'package.json' has a 'typesVersions' entry '>=3.1.0-0' that matches compiler version '7.0.0-dev', looking for a pattern to match module name 'index'.
+Module name 'index', matched pattern 'index'.
+Trying substitution 'ts3.1/index', candidate module location: 'ts3.1/index'.
+Loading module as file / folder, candidate module location '/.src/node_modules/ext/ts3.1/index', target file types: TypeScript, Declaration.
+File '/.src/node_modules/ext/ts3.1/index.ts' does not exist.
+File '/.src/node_modules/ext/ts3.1/index.tsx' does not exist.
+File '/.src/node_modules/ext/ts3.1/index.d.ts' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolving real path for '/.src/node_modules/ext/ts3.1/index.d.ts', result '/.src/node_modules/ext/ts3.1/index.d.ts'.
+======== Module name 'ext' was successfully resolved to '/.src/node_modules/ext/ts3.1/index.d.ts' with Package ID 'ext@1.0.0'. ========
+======== Resolving module 'ext/other' from '/.src/main.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/.src/package.json' does not exist according to earlier cached lookups.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'ext/other' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/.src/node_modules/ext/package.json' exists according to earlier cached lookups.
+'package.json' has a 'typesVersions' entry '>=3.1.0-0' that matches compiler version '7.0.0-dev', looking for a pattern to match module name 'other'.
+File '/.src/node_modules/ext/other.ts' does not exist.
+File '/.src/node_modules/ext/other.tsx' does not exist.
+File '/.src/node_modules/ext/other.d.ts' exists - use it as a name resolution result.
+'package.json' does not have a 'peerDependencies' field.
+Resolving real path for '/.src/node_modules/ext/other.d.ts', result '/.src/node_modules/ext/other.d.ts'.
+======== Module name 'ext/other' was successfully resolved to '/.src/node_modules/ext/other.d.ts' with Package ID 'ext@1.0.0'. ========
+======== Resolving module '../other' from '/.src/node_modules/ext/ts3.1/index.d.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+Loading module as file / folder, candidate module location '/.src/node_modules/ext/other', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/.src/node_modules/ext/other.ts' does not exist.
+File '/.src/node_modules/ext/other.tsx' does not exist.
+File '/.src/node_modules/ext/other.d.ts' exists - use it as a name resolution result.
+File '/.src/node_modules/ext/package.json' exists according to earlier cached lookups.
+'package.json' does not have a 'peerDependencies' field.
+======== Module name '../other' was successfully resolved to '/.src/node_modules/ext/other.d.ts' with Package ID 'ext@1.0.0'. ========
diff --git a/testdata/baselines/reference/submodule/conformance/typingsLookup1.trace.json b/testdata/baselines/reference/submodule/conformance/typingsLookup1.trace.json
new file mode 100644
index 0000000000..0febc68e1d
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/typingsLookup1.trace.json
@@ -0,0 +1,12 @@
+======== Resolving type reference directive 'jquery', containing file '/a.ts', root directory '/node_modules/@types'. ========
+Resolving with primary search path '/node_modules/@types'.
+File '/node_modules/@types/jquery/package.json' does not exist according to earlier cached lookups.
+File '/node_modules/@types/jquery/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/@types/jquery/index.d.ts', result '/node_modules/@types/jquery/index.d.ts'.
+======== Type reference directive 'jquery' was successfully resolved to '/node_modules/@types/jquery/index.d.ts', primary: true. ========
+======== Resolving type reference directive 'jquery', containing file '/__inferred type names__.ts', root directory '/node_modules/@types'. ========
+Resolving with primary search path '/node_modules/@types'.
+File '/node_modules/@types/jquery/package.json' does not exist.
+File '/node_modules/@types/jquery/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/@types/jquery/index.d.ts', result '/node_modules/@types/jquery/index.d.ts'.
+======== Type reference directive 'jquery' was successfully resolved to '/node_modules/@types/jquery/index.d.ts', primary: true. ========
diff --git a/testdata/baselines/reference/submodule/conformance/typingsLookup3.trace.json b/testdata/baselines/reference/submodule/conformance/typingsLookup3.trace.json
new file mode 100644
index 0000000000..b615d44651
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/typingsLookup3.trace.json
@@ -0,0 +1,14 @@
+======== Resolving type reference directive 'JqUeRy', containing file '/a.ts', root directory '/node_modules/@types'. ========
+Resolving with primary search path '/node_modules/@types'.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Looking up in 'node_modules' folder, initial location '/'.
+Searching all ancestor node_modules directories for preferred extensions: Declaration.
+File '/node_modules/JqUeRy.d.ts' does not exist.
+File '/node_modules/@types/JqUeRy.d.ts' does not exist.
+======== Type reference directive 'JqUeRy' was not resolved. ========
+======== Resolving type reference directive 'jquery', containing file '/__inferred type names__.ts', root directory '/node_modules/@types'. ========
+Resolving with primary search path '/node_modules/@types'.
+File '/node_modules/@types/jquery/package.json' does not exist.
+File '/node_modules/@types/jquery/index.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/@types/jquery/index.d.ts', result '/node_modules/@types/jquery/index.d.ts'.
+======== Type reference directive 'jquery' was successfully resolved to '/node_modules/@types/jquery/index.d.ts', primary: true. ========
diff --git a/testdata/baselines/reference/submodule/conformance/typingsLookup4.trace.json b/testdata/baselines/reference/submodule/conformance/typingsLookup4.trace.json
new file mode 100644
index 0000000000..100c208ad4
--- /dev/null
+++ b/testdata/baselines/reference/submodule/conformance/typingsLookup4.trace.json
@@ -0,0 +1,110 @@
+======== Resolving module 'jquery' from '/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/package.json' does not exist.
+Loading module 'jquery' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/node_modules/jquery.ts' does not exist.
+File '/node_modules/jquery.tsx' does not exist.
+File '/node_modules/jquery.d.ts' does not exist.
+File '/node_modules/@types/jquery/package.json' exists according to earlier cached lookups.
+File '/node_modules/@types/jquery.d.ts' does not exist.
+'package.json' has 'typings' field 'jquery.d.ts' that references '/node_modules/@types/jquery/jquery.d.ts'.
+File '/node_modules/@types/jquery/jquery.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/@types/jquery/jquery.d.ts', result '/node_modules/@types/jquery/jquery.d.ts'.
+======== Module name 'jquery' was successfully resolved to '/node_modules/@types/jquery/jquery.d.ts'. ========
+======== Resolving module 'kquery' from '/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'kquery' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/node_modules/kquery.ts' does not exist.
+File '/node_modules/kquery.tsx' does not exist.
+File '/node_modules/kquery.d.ts' does not exist.
+File '/node_modules/@types/kquery/package.json' exists according to earlier cached lookups.
+File '/node_modules/@types/kquery.d.ts' does not exist.
+'package.json' has 'typings' field 'kquery' that references '/node_modules/@types/kquery/kquery'.
+Loading module as file / folder, candidate module location '/node_modules/@types/kquery/kquery', target file types: TypeScript, Declaration.
+File '/node_modules/@types/kquery/kquery.ts' does not exist.
+File '/node_modules/@types/kquery/kquery.tsx' does not exist.
+File '/node_modules/@types/kquery/kquery.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/@types/kquery/kquery.d.ts', result '/node_modules/@types/kquery/kquery.d.ts'.
+======== Module name 'kquery' was successfully resolved to '/node_modules/@types/kquery/kquery.d.ts'. ========
+======== Resolving module 'lquery' from '/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'lquery' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/node_modules/lquery.ts' does not exist.
+File '/node_modules/lquery.tsx' does not exist.
+File '/node_modules/lquery.d.ts' does not exist.
+File '/node_modules/@types/lquery/package.json' exists according to earlier cached lookups.
+File '/node_modules/@types/lquery.d.ts' does not exist.
+'package.json' has 'typings' field 'lquery' that references '/node_modules/@types/lquery/lquery'.
+Loading module as file / folder, candidate module location '/node_modules/@types/lquery/lquery', target file types: TypeScript, Declaration.
+File '/node_modules/@types/lquery/lquery.ts' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/@types/lquery/lquery.ts', result '/node_modules/@types/lquery/lquery.ts'.
+======== Module name 'lquery' was successfully resolved to '/node_modules/@types/lquery/lquery.ts'. ========
+======== Resolving module 'mquery' from '/a.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+File '/package.json' does not exist according to earlier cached lookups.
+Loading module 'mquery' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+File '/node_modules/mquery.ts' does not exist.
+File '/node_modules/mquery.tsx' does not exist.
+File '/node_modules/mquery.d.ts' does not exist.
+File '/node_modules/@types/mquery/package.json' exists according to earlier cached lookups.
+File '/node_modules/@types/mquery.d.ts' does not exist.
+'package.json' has 'typings' field 'mquery' that references '/node_modules/@types/mquery/mquery'.
+Loading module as file / folder, candidate module location '/node_modules/@types/mquery/mquery', target file types: TypeScript, Declaration.
+File '/node_modules/@types/mquery/mquery.ts' does not exist.
+File '/node_modules/@types/mquery/mquery.tsx' does not exist.
+File '/node_modules/@types/mquery/mquery.d.ts' does not exist.
+File '/node_modules/@types/mquery/mquery/index.ts' does not exist.
+File '/node_modules/@types/mquery/mquery/index.tsx' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/@types/mquery/mquery/index.tsx', result '/node_modules/@types/mquery/mquery/index.tsx'.
+======== Module name 'mquery' was successfully resolved to '/node_modules/@types/mquery/mquery/index.tsx'. ========
+======== Resolving type reference directive 'jquery', containing file '/__inferred type names__.ts', root directory '/node_modules/@types'. ========
+Resolving with primary search path '/node_modules/@types'.
+Found 'package.json' at '/node_modules/@types/jquery/package.json'.
+'package.json' does not have a 'typesVersions' field.
+'package.json' has 'typings' field 'jquery.d.ts' that references '/node_modules/@types/jquery/jquery.d.ts'.
+File '/node_modules/@types/jquery/jquery.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/@types/jquery/jquery.d.ts', result '/node_modules/@types/jquery/jquery.d.ts'.
+======== Type reference directive 'jquery' was successfully resolved to '/node_modules/@types/jquery/jquery.d.ts', primary: true. ========
+======== Resolving type reference directive 'kquery', containing file '/__inferred type names__.ts', root directory '/node_modules/@types'. ========
+Resolving with primary search path '/node_modules/@types'.
+Found 'package.json' at '/node_modules/@types/kquery/package.json'.
+'package.json' does not have a 'typesVersions' field.
+'package.json' has 'typings' field 'kquery' that references '/node_modules/@types/kquery/kquery'.
+Loading module as file / folder, candidate module location '/node_modules/@types/kquery/kquery', target file types: TypeScript, Declaration.
+File '/node_modules/@types/kquery/kquery.ts' does not exist.
+File '/node_modules/@types/kquery/kquery.tsx' does not exist.
+File '/node_modules/@types/kquery/kquery.d.ts' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/@types/kquery/kquery.d.ts', result '/node_modules/@types/kquery/kquery.d.ts'.
+======== Type reference directive 'kquery' was successfully resolved to '/node_modules/@types/kquery/kquery.d.ts', primary: true. ========
+======== Resolving type reference directive 'lquery', containing file '/__inferred type names__.ts', root directory '/node_modules/@types'. ========
+Resolving with primary search path '/node_modules/@types'.
+Found 'package.json' at '/node_modules/@types/lquery/package.json'.
+'package.json' does not have a 'typesVersions' field.
+'package.json' has 'typings' field 'lquery' that references '/node_modules/@types/lquery/lquery'.
+Loading module as file / folder, candidate module location '/node_modules/@types/lquery/lquery', target file types: TypeScript, Declaration.
+File '/node_modules/@types/lquery/lquery.ts' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/@types/lquery/lquery.ts', result '/node_modules/@types/lquery/lquery.ts'.
+======== Type reference directive 'lquery' was successfully resolved to '/node_modules/@types/lquery/lquery.ts', primary: true. ========
+======== Resolving type reference directive 'mquery', containing file '/__inferred type names__.ts', root directory '/node_modules/@types'. ========
+Resolving with primary search path '/node_modules/@types'.
+Found 'package.json' at '/node_modules/@types/mquery/package.json'.
+'package.json' does not have a 'typesVersions' field.
+'package.json' has 'typings' field 'mquery' that references '/node_modules/@types/mquery/mquery'.
+Loading module as file / folder, candidate module location '/node_modules/@types/mquery/mquery', target file types: TypeScript, Declaration.
+File '/node_modules/@types/mquery/mquery.ts' does not exist.
+File '/node_modules/@types/mquery/mquery.tsx' does not exist.
+File '/node_modules/@types/mquery/mquery.d.ts' does not exist.
+File '/node_modules/@types/mquery/mquery/index.ts' does not exist.
+File '/node_modules/@types/mquery/mquery/index.tsx' exists - use it as a name resolution result.
+Resolving real path for '/node_modules/@types/mquery/mquery/index.tsx', result '/node_modules/@types/mquery/mquery/index.tsx'.
+======== Type reference directive 'mquery' was successfully resolved to '/node_modules/@types/mquery/mquery/index.tsx', primary: true. ========
diff --git a/testdata/baselines/reference/tsc/extends/configDir-template-with-commandline.js b/testdata/baselines/reference/tsc/extends/configDir-template-with-commandline.js
index 816c9654de..d6c4cd5960 100644
--- a/testdata/baselines/reference/tsc/extends/configDir-template-with-commandline.js
+++ b/testdata/baselines/reference/tsc/extends/configDir-template-with-commandline.js
@@ -51,6 +51,50 @@ export const x = 10;
 tsgo --explainFiles --outDir ${configDir}/outDir
 ExitStatus:: DiagnosticsPresent_OutputsGenerated
 Output::
+======== Resolving module '@myscope/sometype' from '/home/src/projects/myproject/main.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+'paths' option is specified, looking for a pattern to match module name '@myscope/sometype'.
+Module name '@myscope/sometype', matched pattern '@myscope/*'.
+Trying substitution '/home/src/projects/myproject/types/*', candidate module location: '/home/src/projects/myproject/types/sometype'.
+Loading module as file / folder, candidate module location '/home/src/projects/myproject/types/sometype', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/home/src/projects/myproject/types/sometype.ts' exists - use it as a name resolution result.
+======== Module name '@myscope/sometype' was successfully resolved to '/home/src/projects/myproject/types/sometype.ts'. ========
+======== Resolving module 'other/sometype2' from '/home/src/projects/myproject/src/secondary.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+'paths' option is specified, looking for a pattern to match module name 'other/sometype2'.
+Module name 'other/sometype2', matched pattern 'other/*'.
+Trying substitution 'other/*', candidate module location: 'other/sometype2'.
+Loading module as file / folder, candidate module location '/home/src/projects/configs/second/other/sometype2', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/home/src/projects/myproject/src/package.json' does not exist.
+File '/home/src/projects/myproject/package.json' does not exist.
+File '/home/src/projects/package.json' does not exist.
+File '/home/src/package.json' does not exist.
+File '/home/package.json' does not exist.
+File '/package.json' does not exist.
+Loading module 'other/sometype2' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Directory '/home/src/projects/myproject/src/node_modules' does not exist, skipping all lookups in it.
+Directory '/home/src/projects/myproject/src/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/home/src/projects/myproject/node_modules' does not exist, skipping all lookups in it.
+Directory '/home/src/projects/myproject/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/home/src/projects/node_modules' does not exist, skipping all lookups in it.
+Directory '/home/src/projects/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/home/src/node_modules' does not exist, skipping all lookups in it.
+Directory '/home/src/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/home/node_modules' does not exist, skipping all lookups in it.
+Directory '/home/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript, JSON.
+Directory '/home/src/projects/myproject/src/node_modules' does not exist, skipping all lookups in it.
+Directory '/home/src/projects/myproject/node_modules' does not exist, skipping all lookups in it.
+Directory '/home/src/projects/node_modules' does not exist, skipping all lookups in it.
+Directory '/home/src/node_modules' does not exist, skipping all lookups in it.
+Directory '/home/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+======== Module name 'other/sometype2' was not resolved. ========
 tsconfig.json:3:5 - error TS5090: Non-relative paths are not allowed. Did you forget a leading './'?
 
 3     "compilerOptions": {
diff --git a/testdata/baselines/reference/tsc/extends/configDir-template.js b/testdata/baselines/reference/tsc/extends/configDir-template.js
index 084f1836b3..4ea0c2d01d 100644
--- a/testdata/baselines/reference/tsc/extends/configDir-template.js
+++ b/testdata/baselines/reference/tsc/extends/configDir-template.js
@@ -51,6 +51,50 @@ export const x = 10;
 tsgo --explainFiles
 ExitStatus:: DiagnosticsPresent_OutputsGenerated
 Output::
+======== Resolving module '@myscope/sometype' from '/home/src/projects/myproject/main.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+'paths' option is specified, looking for a pattern to match module name '@myscope/sometype'.
+Module name '@myscope/sometype', matched pattern '@myscope/*'.
+Trying substitution '/home/src/projects/myproject/types/*', candidate module location: '/home/src/projects/myproject/types/sometype'.
+Loading module as file / folder, candidate module location '/home/src/projects/myproject/types/sometype', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/home/src/projects/myproject/types/sometype.ts' exists - use it as a name resolution result.
+======== Module name '@myscope/sometype' was successfully resolved to '/home/src/projects/myproject/types/sometype.ts'. ========
+======== Resolving module 'other/sometype2' from '/home/src/projects/myproject/src/secondary.ts'. ========
+Module resolution kind is not specified, using 'Bundler'.
+Resolving in CJS mode with conditions 'require', 'types'.
+'paths' option is specified, looking for a pattern to match module name 'other/sometype2'.
+Module name 'other/sometype2', matched pattern 'other/*'.
+Trying substitution 'other/*', candidate module location: 'other/sometype2'.
+Loading module as file / folder, candidate module location '/home/src/projects/configs/second/other/sometype2', target file types: TypeScript, JavaScript, Declaration, JSON.
+File '/home/src/projects/myproject/src/package.json' does not exist.
+File '/home/src/projects/myproject/package.json' does not exist.
+File '/home/src/projects/package.json' does not exist.
+File '/home/src/package.json' does not exist.
+File '/home/package.json' does not exist.
+File '/package.json' does not exist.
+Loading module 'other/sometype2' from 'node_modules' folder, target file types: TypeScript, JavaScript, Declaration, JSON.
+Searching all ancestor node_modules directories for preferred extensions: TypeScript, Declaration.
+Directory '/home/src/projects/myproject/src/node_modules' does not exist, skipping all lookups in it.
+Directory '/home/src/projects/myproject/src/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/home/src/projects/myproject/node_modules' does not exist, skipping all lookups in it.
+Directory '/home/src/projects/myproject/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/home/src/projects/node_modules' does not exist, skipping all lookups in it.
+Directory '/home/src/projects/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/home/src/node_modules' does not exist, skipping all lookups in it.
+Directory '/home/src/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/home/node_modules' does not exist, skipping all lookups in it.
+Directory '/home/node_modules/@types' does not exist, skipping all lookups in it.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules/@types' does not exist, skipping all lookups in it.
+Searching all ancestor node_modules directories for fallback extensions: JavaScript, JSON.
+Directory '/home/src/projects/myproject/src/node_modules' does not exist, skipping all lookups in it.
+Directory '/home/src/projects/myproject/node_modules' does not exist, skipping all lookups in it.
+Directory '/home/src/projects/node_modules' does not exist, skipping all lookups in it.
+Directory '/home/src/node_modules' does not exist, skipping all lookups in it.
+Directory '/home/node_modules' does not exist, skipping all lookups in it.
+Directory '/node_modules' does not exist, skipping all lookups in it.
+======== Module name 'other/sometype2' was not resolved. ========
 tsconfig.json:3:5 - error TS5090: Non-relative paths are not allowed. Did you forget a leading './'?
 
 3     "compilerOptions": {