fix(bundling): correctly handle .cjs.js .mjs.js in rollup for type definitions (#29366)

…le extensions for type definitions.

Updated the Rollup plugin's logic for generating type definition files
to ensure compatibility with additional file extensions, including
.cjs.js and .mjs.js.

This change improves the handling of entry points and ensures that
corresponding .d.ts files are correctly named and emitted in all
supported scenarios.

Added a comprehensive test case to validate the new behavior.

closed #29308

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## Current Behavior
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Fixes #

---------

Co-authored-by: Colum Ferry <cferry09@gmail.com>

e2e/release/src/release-publishable-libraries-ts-solution.test.ts

@@ -168,8 +168,8 @@ describe('release publishable libraries in workspace with ts solution setup', ()
       📦  @proj/{project-name}@0.0.3
       === Tarball Contents ===
       XXB README.md
+      XXB dist/index.d.ts
       XXB dist/index.esm.css
-      XXB dist/index.esm.d.ts
       XXB dist/index.esm.js
       XXX.XXX kb dist/README.md
       XXB dist/src/index.d.ts

e2e/release/src/release-publishable-libraries.test.ts

@@ -170,8 +170,8 @@ describe('release publishable libraries', () => {
       📦  @proj/{project-name}@0.0.3
       === Tarball Contents ===
       XXX.XXX kb README.md
+      XXB index.d.ts
       XXB index.esm.css
-      XXB index.esm.d.ts
       XXB index.esm.js
       XXXB package.json
       XXB src/index.d.ts

e2e/rollup/src/rollup-legacy.test.ts

@@ -41,13 +41,13 @@ describe('Rollup Plugin', () => {
     );
     rmDist();
     runCLI(`build ${myPkg} --format=cjs,esm --generateExportsField`);
-    checkFilesExist(`dist/libs/${myPkg}/index.cjs.d.ts`);
+    checkFilesExist(`dist/libs/${myPkg}/index.d.ts`);
     expect(readJson(`dist/libs/${myPkg}/package.json`).exports).toEqual({
       '.': {
         module: './index.esm.js',
         import: './index.cjs.mjs',
         default: './index.cjs.js',
-        types: './index.esm.d.ts',
+        types: './index.d.ts',
       },
       './package.json': './package.json',
     });
@@ -106,7 +106,7 @@ describe('Rollup Plugin', () => {
 
     checkFilesExist(`dist/libs/${myPkg}/index.esm.js`);
     checkFilesExist(`dist/libs/${myPkg}/index.cjs.js`);
-    checkFilesExist(`dist/libs/${myPkg}/index.cjs.d.ts`);
+    checkFilesExist(`dist/libs/${myPkg}/index.d.ts`);
     checkFilesExist(`dist/libs/${myPkg}/foo.esm.js`);
     checkFilesExist(`dist/libs/${myPkg}/foo.cjs.js`);
     checkFilesExist(`dist/libs/${myPkg}/bar.esm.js`);
@@ -117,19 +117,19 @@ describe('Rollup Plugin', () => {
         module: './index.esm.js',
         import: './index.cjs.mjs',
         default: './index.cjs.js',
-        types: './index.esm.d.ts',
+        types: './index.d.ts',
       },
       './bar': {
         module: './bar.esm.js',
         import: './bar.cjs.mjs',
         default: './bar.cjs.js',
-        types: './bar.esm.d.ts',
+        types: './bar.d.ts',
       },
       './foo': {
         module: './foo.esm.js',
         import: './foo.cjs.mjs',
         default: './foo.cjs.js',
-        types: './foo.esm.d.ts',
+        types: './foo.d.ts',
       },
     });
   });

e2e/rollup/src/rollup.test.ts

@@ -43,13 +43,13 @@ describe('Rollup Plugin', () => {
     );
     rmDist();
     runCLI(`build ${myPkg}`);
-    checkFilesExist(`dist/libs/${myPkg}/index.cjs.d.ts`);
+    checkFilesExist(`dist/libs/${myPkg}/index.d.ts`);
     expect(readJson(`dist/libs/${myPkg}/package.json`).exports).toEqual({
       '.': {
         module: './index.esm.js',
         import: './index.cjs.mjs',
         default: './index.cjs.js',
-        types: './index.esm.d.ts',
+        types: './index.d.ts',
       },
       './package.json': './package.json',
     });
@@ -139,7 +139,7 @@ describe('Rollup Plugin', () => {
     checkFilesExist(`dist/libs/${myPkg}/index.esm.js.map`);
     checkFilesExist(`dist/libs/${myPkg}/index.cjs.js`);
     checkFilesExist(`dist/libs/${myPkg}/index.cjs.js.map`);
-    checkFilesExist(`dist/libs/${myPkg}/index.cjs.d.ts`);
+    checkFilesExist(`dist/libs/${myPkg}/index.d.ts`);
     checkFilesExist(`dist/libs/${myPkg}/foo.esm.js`);
     checkFilesExist(`dist/libs/${myPkg}/foo.esm.js.map`);
     checkFilesExist(`dist/libs/${myPkg}/foo.cjs.js`);
@@ -154,19 +154,19 @@ describe('Rollup Plugin', () => {
         module: './index.esm.js',
         import: './index.cjs.mjs',
         default: './index.cjs.js',
-        types: './index.esm.d.ts',
+        types: './index.d.ts',
       },
       './bar': {
         module: './bar.esm.js',
         import: './bar.cjs.mjs',
         default: './bar.cjs.js',
-        types: './bar.esm.d.ts',
+        types: './bar.d.ts',
       },
       './foo': {
         module: './foo.esm.js',
         import: './foo.cjs.mjs',
         default: './foo.cjs.js',
-        types: './foo.esm.d.ts',
+        types: './foo.d.ts',
       },
     });
   });

packages/js/src/plugins/rollup/type-definitions.spec.ts

@@ -0,0 +1,71 @@
+import { typeDefinitions } from './type-definitions';
+describe('typeDefinitions', () => {
+  it('should emit correct .d.ts filenames for various file formats', () => {
+    const mockBundle = {
+      'index.js': {
+        type: 'chunk',
+        isEntry: true,
+        fileName: 'index.js',
+        facadeModuleId: '/project/src/index.ts',
+        exports: ['default', 'namedExport1', 'namedExport2'],
+      },
+      'index1.js': {
+        type: 'chunk',
+        isEntry: true,
+        fileName: 'index.cjs',
+        facadeModuleId: '/project/src/index.ts',
+        exports: ['default', 'namedExport1', 'namedExport2'],
+      },
+      'index2.js': {
+        type: 'chunk',
+        isEntry: true,
+        fileName: 'index.mjs',
+        facadeModuleId: '/project/src/index.ts',
+        exports: ['default', 'namedExport1', 'namedExport2'],
+      },
+      'index3.js': {
+        type: 'chunk',
+        isEntry: true,
+        fileName: 'index.cjs.js',
+        facadeModuleId: '/project/src/index.ts',
+        exports: ['default', 'namedExport1', 'namedExport2'],
+      },
+      'index4.js': {
+        type: 'chunk',
+        isEntry: true,
+        fileName: 'index.mjs.js',
+        facadeModuleId: '/project/src/index.ts',
+        exports: ['default', 'namedExport1', 'namedExport2'],
+      },
+    };
+
+    const mockOpts = {}; // Can be left empty for this scenario
+
+    const mockEmitFile = jest.fn();
+
+    const plugin = typeDefinitions({ projectRoot: '/project' });
+
+    // Simulate the `this` context of a Rollup plugin
+    const mockContext = {
+      emitFile: mockEmitFile,
+    };
+
+    // Run the plugin's `generateBundle` function
+    (async function testPlugin() {
+      await plugin.generateBundle.call(mockContext, mockOpts, mockBundle);
+
+      // Verify the correct .d.ts filenames are generated for different file formats
+      const expectedFileNames = [
+        'index.d.ts', // from index.js
+        'index.d.ts', // from index.cjs
+        'index.d.ts', // from index.mjs
+        'index.d.ts', // from index.cjs.js
+        'index.d.ts', // from index.mjs.js
+      ];
+
+      mockEmitFile.mock.calls.forEach(([{ fileName }], index) => {
+        expect(fileName).toBe(expectedFileNames[index]);
+      });
+    })();
+  });
+});

packages/js/src/plugins/rollup/type-definitions.ts

@@ -38,7 +38,14 @@ export function typeDefinitions(options: { projectRoot: string }) {
           /\.[cm]?[jt]sx?$/,
           ''
         );
-        const dtsFileName = file.fileName.replace(/\.[cm]?js$/, '.d.ts');
+
+        // Replace various JavaScript file extensions (e.g., .js, .cjs, .mjs, .cjs.js, .mjs.js) with .d.ts for generating type definition file names.
+        // This regex matches the pattern used in packages/rollup/src/plugins/package-json/update-package-json.ts
+        const dtsFileName = file.fileName.replace(
+          /(\.cjs|\.mjs|\.esm\.js|\.cjs\.js|\.mjs\.js|\.js)$/,
+          '.d.ts'
+        );
+
         const relativeSourceDtsName = JSON.stringify('./' + entrySourceDtsName);
         const dtsFileSource = hasDefaultExport
           ? stripIndents`

packages/rollup/src/plugins/package-json/update-package-json.spec.ts

@@ -32,13 +32,13 @@ describe('updatePackageJson', () => {
           './package.json': './package.json',
           '.': {
             import: './index.esm.js',
-            types: './index.esm.d.ts',
+            types: './index.d.ts',
           },
         },
         main: './index.esm.js',
         module: './index.esm.js',
         type: 'module',
-        types: './index.esm.d.ts',
+        types: './index.d.ts',
       });
 
       spy.mockRestore();
@@ -63,7 +63,7 @@ describe('updatePackageJson', () => {
         },
         main: './index.cjs.js',
         type: 'commonjs',
-        types: './index.cjs.d.ts',
+        types: './index.d.ts',
       });
 
       spy.mockRestore();
@@ -88,12 +88,12 @@ describe('updatePackageJson', () => {
             module: './index.esm.js',
             import: './index.cjs.mjs',
             default: './index.cjs.js',
-            types: './index.esm.d.ts',
+            types: './index.d.ts',
           },
         },
         main: './index.cjs.js',
         module: './index.esm.js',
-        types: './index.esm.d.ts',
+        types: './index.d.ts',
       });
 
       spy.mockRestore();
@@ -123,7 +123,7 @@ describe('updatePackageJson', () => {
           './package.json': './package.json',
           '.': {
             import: './index.esm.js',
-            types: './index.esm.d.ts',
+            types: './index.d.ts',
           },
           './foo': {
             import: './some/custom/path/foo.esm.js',
@@ -133,7 +133,7 @@ describe('updatePackageJson', () => {
         main: './index.esm.js',
         module: './index.esm.js',
         type: 'module',
-        types: './index.esm.d.ts',
+        types: './index.d.ts',
       });
 
       spy.mockRestore();
@@ -156,7 +156,7 @@ describe('updatePackageJson', () => {
         main: './index.esm.js',
         module: './index.esm.js',
         type: 'module',
-        types: './index.esm.d.ts',
+        types: './index.d.ts',
       });
 
       spy.mockRestore();
@@ -176,7 +176,7 @@ describe('updatePackageJson', () => {
       expect(utils.writeJsonFile).toHaveBeenCalledWith(expect.anything(), {
         main: './index.cjs.js',
         type: 'commonjs',
-        types: './index.cjs.d.ts',
+        types: './index.d.ts',
       });
 
       spy.mockRestore();
@@ -196,7 +196,7 @@ describe('updatePackageJson', () => {
       expect(utils.writeJsonFile).toHaveBeenCalledWith(expect.anything(), {
         main: './index.cjs.js',
         module: './index.esm.js',
-        types: './index.esm.d.ts',
+        types: './index.d.ts',
       });
 
       spy.mockRestore();
@@ -221,7 +221,7 @@ describe('updatePackageJson', () => {
         main: './index.esm.js',
         module: './index.esm.js',
         type: 'module',
-        types: './index.esm.d.ts',
+        types: './index.d.ts',
         exports: {
           './foo': './foo.esm.js',
         },
@@ -251,7 +251,7 @@ describe('updatePackageJson', () => {
       expect(utils.writeJsonFile).toHaveBeenCalledWith(expect.anything(), {
         main: './index.esm.js',
         module: './index.esm.js',
-        types: './index.esm.d.ts',
+        types: './index.d.ts',
         exports: {
           './foo': './foo.esm.js',
         },
@@ -279,7 +279,7 @@ describe('updatePackageJson', () => {
         main: './index.esm.js',
         module: './index.esm.js',
         type: 'module',
-        types: './index.esm.d.ts',
+        types: './index.d.ts',
         exports: {
           './foo': './foo.esm.js',
         },
@@ -308,7 +308,7 @@ describe('updatePackageJson', () => {
         main: './index.esm.js',
         module: './index.esm.js',
         type: 'module',
-        types: './index.esm.d.ts',
+        types: './index.d.ts',
         exports: {
           './foo': './foo.esm.js',
         },

packages/rollup/src/plugins/package-json/update-package-json.ts

@@ -16,6 +16,7 @@ export function updatePackageJson(
   },
   packageJson: PackageJson
 ) {
+  const jsFileRegex = /(\.cjs|\.mjs|\.esm\.js|\.cjs\.js|\.mjs\.js|\.js)$/;
   const hasEsmFormat = options.format.includes('esm');
   const hasCjsFormat = options.format.includes('cjs');
 
@@ -46,7 +47,7 @@ export function updatePackageJson(
           // Reserve `module` entry for bundlers to accommodate tree-shaking.
           {
             [hasCjsFormat ? 'module' : 'import']: filePath,
-            types: filePath.replace(/\.js$/, '.d.ts'),
+            types: filePath.replace(jsFileRegex, '.d.ts'),
           };
       }
     }
@@ -110,9 +111,9 @@ export function updatePackageJson(
   }
 
   if (packageJson.module) {
-    packageJson.types ??= packageJson.module.replace(/\.js$/, '.d.ts');
+    packageJson.types ??= packageJson.module.replace(jsFileRegex, '.d.ts');
   } else {
-    packageJson.types ??= packageJson.main.replace(/\.js$/, '.d.ts');
+    packageJson.types ??= packageJson.main.replace(jsFileRegex, '.d.ts');
   }
 
   writeJsonFile(