import-js · JounQin · Apr 21, 2025 · Apr 21, 2025
diff --git a/.changeset/late-elephants-confess.md b/.changeset/late-elephants-confess.md
@@ -0,0 +1,5 @@
+---
+"eslint-import-resolver-typescript": patch
+---
+
+fix: add more extension aliases for ts source/declaration files
diff --git a/README.md b/README.md
@@ -282,9 +282,19 @@ Default:
    ".d.ts",
    ".js",
  ],
+  ".ts": [".ts", ".d.ts", ".js"],
  ".jsx": [".tsx", ".d.ts", ".jsx"],
+  ".tsx": [
+    ".tsx",
+    ".d.ts",
+    ".jsx",
+    // `.tsx` can also be compiled as `.js`
+    ".js",
+  ],
  ".cjs": [".cts", ".d.cts", ".cjs"],
+  ".cts": [".cts", ".d.cts", ".cjs"],
  ".mjs": [".mts", ".d.mts", ".mjs"],
+  ".mts": [".mts", ".d.mts", ".mjs"],
 }
 ```


diff --git a/src/constants.ts b/src/constants.ts
@@ -36,9 +36,19 @@ export const defaultExtensionAlias = {
    '.d.ts',
    '.js',
  ],
+  '.ts': ['.ts', '.d.ts', '.js'],
  '.jsx': ['.tsx', '.d.ts', '.jsx'],
+  '.tsx': [
+    '.tsx',
+    '.d.ts',
+    '.jsx',
+    // `.tsx` can also be compiled as `.js`
+    '.js',
+  ],
  '.cjs': ['.cts', '.d.cts', '.cjs'],
+  '.cts': ['.cts', '.d.cts', '.cjs'],
  '.mjs': ['.mts', '.d.mts', '.mjs'],
+  '.mts': ['.mts', '.d.mts', '.mjs'],
 }

 export const defaultMainFields = [

diff --git a/src/index.ts b/src/index.ts
@@ -50,7 +50,7 @@ const unrsResolve = (
    }
  }
  if (result.error) {
-    log('oxc resolve error:', result.error)
+    log('unrs-resolver error:', result.error)
    if (TSCONFIG_NOT_FOUND_REGEXP.test(result.error)) {
      throw new Error(result.error)
    }

diff --git a/tests/unit/dts/foo.d.ts b/tests/unit/dts/foo.d.ts
diff --git a/tests/unit/unit.spec.ts b/tests/unit/unit.spec.ts
@@ -7,19 +7,19 @@ import {
  TSCONFIG_NOT_FOUND_REGEXP,
 } from 'eslint-import-resolver-typescript'

-describe('createTypeScriptImportResolver', async () => {
-  const { dirname } = import.meta
-
-  const pnpDir = path.resolve(dirname, 'pnp')
+const { dirname } = import.meta

-  await exec('yarn', [], {
-    nodeOptions: {
-      cwd: pnpDir,
-    },
-  })
+describe('createTypeScriptImportResolver', async () => {
+  const resolver = createTypeScriptImportResolver()

  it('should work with pnp', async () => {
-    const resolver = createTypeScriptImportResolver()
+    const pnpDir = path.resolve(dirname, 'pnp')
+
+    await exec('yarn', [], {
+      nodeOptions: {
+        cwd: pnpDir,
+      },
+    })

    const testfile = path.resolve(pnpDir, '__test__.js')

@@ -38,6 +38,19 @@ describe('createTypeScriptImportResolver', async () => {
    `)
  })

+  it('should resolve .d.ts with .ts extension', () => {
+    const dtsDir = path.resolve(dirname, 'dts')
+
+    const testfile = path.resolve(dtsDir, '__test__.js')
+
+    expect(resolver.resolve('./foo.ts', testfile)).toMatchInlineSnapshot(`
+      {
+        "found": true,
+        "path": "<ROOT>/tests/unit/dts/foo.d.ts",
+      }
+    `)
+  })
+
  it('should error on malformed tsconfig reference', () => {
    const project = path.resolve(dirname, 'malformed-reference')