Always emit tsbuild info if path says so (irrespecitive of if there exists bundle and project)

Author: sheetalkamat

src/compiler/emitter.ts

@@ -284,7 +284,6 @@ namespace ts {
             // Write build information if applicable
             if (!buildInfoPath || targetSourceFile || emitSkipped) return;
             const program = host.getProgramBuildInfo();
-            if (!bundle && !program) return;
             if (host.isEmitBlocked(buildInfoPath) || compilerOptions.noEmit) {
                 emitSkipped = true;
                 return;

src/compiler/tsbuild.ts

@@ -1524,7 +1524,7 @@ namespace ts {
             if (buildInfoPath) {
                 const value = state.readFileWithCache(buildInfoPath);
                 const buildInfo = value && getBuildInfo(value);
-                if (buildInfo && buildInfo.version !== version) {
+                if (buildInfo && (buildInfo.bundle || buildInfo.program) && buildInfo.version !== version) {
                     return {
                         type: UpToDateStatusType.TsVersionOutputOfDate,
                         version: buildInfo.version

src/harness/fakes.ts

@@ -418,7 +418,12 @@ namespace fakes {
     export const version = "FakeTSVersion";
 
     export class SolutionBuilderHost extends CompilerHost implements ts.SolutionBuilderHost<ts.BuilderProgram> {
-        createProgram = ts.createEmitAndSemanticDiagnosticsBuilderProgram;
+        createProgram: ts.CreateProgram<ts.BuilderProgram>;
+
+        constructor(sys: System | vfs.FileSystem, options?: ts.CompilerOptions, setParentNodes?: boolean, createProgram?: ts.CreateProgram<ts.BuilderProgram>) {
+            super(sys, options, setParentNodes);
+            this.createProgram = createProgram || ts.createEmitAndSemanticDiagnosticsBuilderProgram;
+        }
 
         readFile(path: string) {
             const value = super.readFile(path);

src/testRunner/unittests/tsbuild/sample.ts

@@ -2,9 +2,9 @@ namespace ts {
     describe("unittests:: tsbuild:: on 'sample1' project", () => {
         let projFs: vfs.FileSystem;
         const { time, tick } = getTime();
-        const testsOutputs = ["/src/tests/index.js"];
-        const logicOutputs = ["/src/logic/index.js", "/src/logic/index.js.map", "/src/logic/index.d.ts"];
-        const coreOutputs = ["/src/core/index.js", "/src/core/index.d.ts", "/src/core/index.d.ts.map"];
+        const testsOutputs = ["/src/tests/index.js", "/src/tests/index.d.ts", "/src/tests/tsconfig.tsbuildinfo"];
+        const logicOutputs = ["/src/logic/index.js", "/src/logic/index.js.map", "/src/logic/index.d.ts", "/src/logic/tsconfig.tsbuildinfo"];
+        const coreOutputs = ["/src/core/index.js", "/src/core/index.d.ts", "/src/core/index.d.ts.map", "/src/core/tsconfig.tsbuildinfo"];
         const allExpectedOutputs = [...testsOutputs, ...logicOutputs, ...coreOutputs];
 
         before(() => {
@@ -272,6 +272,35 @@ namespace ts {
                 );
             });
 
+            it("does not rebuild if there is no program and bundle in the ts build info event if version doesnt match ts version", () => {
+                const fs = projFs.shadow();
+                const host = new fakes.SolutionBuilderHost(fs, /*options*/ undefined, /*setParentNodes*/ undefined, createAbstractBuilder);
+                let builder = createSolutionBuilder(host, ["/src/tests"], { verbose: true });
+                builder.build();
+                host.assertDiagnosticMessages(
+                    getExpectedDiagnosticForProjectsInBuild("src/core/tsconfig.json", "src/logic/tsconfig.json", "src/tests/tsconfig.json"),
+                    [Diagnostics.Project_0_is_out_of_date_because_output_file_1_does_not_exist, "src/core/tsconfig.json", "src/core/anotherModule.js"],
+                    [Diagnostics.Building_project_0, "/src/core/tsconfig.json"],
+                    [Diagnostics.Project_0_is_out_of_date_because_output_file_1_does_not_exist, "src/logic/tsconfig.json", "src/logic/index.js"],
+                    [Diagnostics.Building_project_0, "/src/logic/tsconfig.json"],
+                    [Diagnostics.Project_0_is_out_of_date_because_output_file_1_does_not_exist, "src/tests/tsconfig.json", "src/tests/index.js"],
+                    [Diagnostics.Building_project_0, "/src/tests/tsconfig.json"]
+                );
+                verifyOutputsPresent(fs, allExpectedOutputs);
+
+                host.clearDiagnostics();
+                tick();
+                builder = createSolutionBuilder(host, ["/src/tests"], { verbose: true });
+                changeCompilerVersion(host);
+                builder.build();
+                host.assertDiagnosticMessages(
+                    getExpectedDiagnosticForProjectsInBuild("src/core/tsconfig.json", "src/logic/tsconfig.json", "src/tests/tsconfig.json"),
+                    [Diagnostics.Project_0_is_up_to_date_because_newest_input_1_is_older_than_oldest_output_2, "src/core/tsconfig.json", "src/core/anotherModule.ts", "src/core/anotherModule.js"],
+                    [Diagnostics.Project_0_is_up_to_date_because_newest_input_1_is_older_than_oldest_output_2, "src/logic/tsconfig.json", "src/logic/index.ts", "src/logic/index.js"],
+                    [Diagnostics.Project_0_is_up_to_date_because_newest_input_1_is_older_than_oldest_output_2, "src/tests/tsconfig.json", "src/tests/index.ts", "src/tests/index.js"]
+                );
+            });
+
             it("rebuilds from start if --f is passed", () => {
                 const { host, builder } = initializeWithBuild({ force: true });
                 builder.build();