Add v3 resolver interface

Author: romanlex

src/index.ts

@@ -7,7 +7,7 @@ import { digestHashObject } from './helpers'
 import { logger } from './logger'
 import { resolveImport } from './resolveImport'
 
-import type { InternalResolverOptions, ResolverOptions } from './types'
+import type { InternalResolverOptions, ResolvedResult, ResolverOptions } from './types'
 import type { Resolver } from 'enhanced-resolve'
 
 const times = []
@@ -25,11 +25,7 @@ export const interfaceVersion = 2
  * @param file the importing file's full path; i.e. '/usr/local/bin/file.js'
  * @param options
  */
-export function resolve(
-  specifier: string,
-  file: string,
-  options?: ResolverOptions | undefined | null
-): { found: boolean; path?: string | null } {
+export function resolve(specifier: string, file: string, options?: ResolverOptions | undefined | null): ResolvedResult {
   let t0: DOMHighResTimeStamp = 0
 
   if (options?.performanceToLog) t0 = performance.now()
@@ -62,3 +58,35 @@ export function resolve(
 
   return result
 }
+
+export function createCustomResolver(options: ResolverOptions) {
+  const resolver = enhancedResolve.ResolverFactory.createResolver({
+    ...options,
+    conditionNames: options?.conditionNames ?? defaultConditionNames,
+    extensions: options?.extensions ?? defaultExtensions,
+    extensionAlias: options?.extensionAlias ?? defaultExtensionAlias,
+    mainFields: options?.mainFields ?? defaultMainFields,
+    fileSystem: new enhancedResolve.CachedInputFileSystem(fs, 5 * 1000),
+    useSyncFileSystemCalls: true,
+  })
+
+  return {
+    name: 'eslint-import-resolver-x',
+    interfaceVersion: 3,
+    resolve(modulePath: string, source: string) {
+      let t0: DOMHighResTimeStamp = 0
+
+      if (options?.performanceToLog) t0 = performance.now()
+
+      const result = resolveImport(modulePath, source, cachedOptions, resolver)
+
+      if (options?.performanceToLog) {
+        const t1 = performance.now()
+        times.push(t1 - t0)
+        logger('time resolve:', t1)
+      }
+
+      return result
+    },
+  }
+}

src/resolveImport.ts

@@ -11,7 +11,7 @@ import { isFile, isModule, removeQuerystring } from './helpers'
 import { init } from './init'
 import { logger } from './logger'
 
-import type { InternalResolverOptions, Matcher } from './types'
+import type { InternalResolverOptions, Matcher, ResolvedResult } from './types'
 import type { Resolver } from 'enhanced-resolve'
 import type { TsConfigResult } from 'get-tsconfig'
 import type { Version } from 'is-bun-module'
@@ -25,14 +25,14 @@ const possiblePathsBySpecifier: Map<string, { paths: string[]; path: TsConfigRes
  * @param {string} file path of the file importing the specifier
  * @param {InternalResolverOptions} options options for the resolver
  * @param {Resolver} resolver resolver to use for resolving
- * @returns { found: boolean; path?: string | null } whether the import was found and the resolved path
+ * @returns {ResolvedResult} whether the import was found and the resolved path
  */
 export function resolveImport(
   specifier: string,
   file: string,
   options: InternalResolverOptions,
   resolver: Resolver
-): { found: boolean; path?: string | null } {
+): ResolvedResult {
   logger('Resolving:', `'${specifier}'`, 'from:', file)
 
   specifier = removeQuerystring(specifier)

src/types.ts

@@ -19,3 +19,15 @@ export type Matcher = {
   path: string
   config: TsConfigJsonResolved
 }
+
+export type ResultNotFound = {
+  found: false
+  path?: undefined
+}
+
+export type ResultFound = {
+  found: true
+  path: string | null
+}
+
+export type ResolvedResult = ResultNotFound | ResultFound