fix: do not use CJS methods in ESM

package.json

@@ -20,8 +20,8 @@
     "test": "pnpm run test:unit && pnpm run test:integration && pnpm run test:e2e",
     "test:benchmark": "cd ./tests && pnpm run test:benchmark",
     "test:e2e": "pnpm run build:examples && cd tests && pnpm run test:e2e",
-    "test:integration": "vitest run --project integration",
-    "test:integration:watch": "vitest --project integration",
+    "test:integration": "NODE_OPTIONS='--experimental-vm-modules' vitest run --project integration",
+    "test:integration:watch": "NODE_OPTIONS='--experimental-vm-modules' vitest --project integration",
     "test:unit": "vitest run --project unit*",
     "test:unit:watch": "vitest --project unit*",
     "testu": "pnpm run test:unit -u && pnpm run test:integration -u",

packages/core/src/config.ts

@@ -24,19 +24,24 @@ import {
   cssExternalHandler,
   isCssGlobalFile,
 } from './css/cssConfig';
-import { pluginCjsShim } from './plugins/cjsShim';
+import {
+  pluginCjsImportMetaUrlShim,
+  pluginEsmRequireShim,
+} from './plugins/shims';
 import type {
   AutoExternal,
   BannerAndFooter,
   Format,
   LibConfig,
   PkgJson,
   Redirect,
+  ResolvedShims,
   RsbuildConfigOutputTarget,
   RslibConfig,
   RslibConfigAsyncFn,
   RslibConfigExport,
   RslibConfigSyncFn,
+  Shims,
   Syntax,
 } from './types';
 import { getDefaultExtension } from './utils/extension';
@@ -447,12 +452,16 @@ export async function createConstantRsbuildConfig(): Promise<RsbuildConfig> {
 
 const composeFormatConfig = (format: Format): RsbuildConfig => {
   const jsParserOptions = {
-    importMeta: false,
-    requireResolve: false,
-    requireDynamic: false,
-    requireAsExpression: false,
-    importDynamic: false,
-  };
+    cjs: {
+      requireResolve: false,
+      requireDynamic: false,
+      requireAsExpression: false,
+    },
+    esm: {
+      importMeta: false,
+      importDynamic: false,
+    },
+  } as const;
 
   switch (format) {
     case 'esm':
@@ -461,7 +470,10 @@ const composeFormatConfig = (format: Format): RsbuildConfig => {
           rspack: {
             module: {
               parser: {
-                javascript: jsParserOptions,
+                javascript: {
+                  ...jsParserOptions.esm,
+                  ...jsParserOptions.cjs,
+                },
               },
             },
             optimization: {
@@ -486,12 +498,11 @@ const composeFormatConfig = (format: Format): RsbuildConfig => {
       };
     case 'cjs':
       return {
-        plugins: [pluginCjsShim()],
         tools: {
           rspack: {
             module: {
               parser: {
-                javascript: jsParserOptions,
+                javascript: { ...jsParserOptions.esm, ...jsParserOptions.cjs },
               },
             },
             output: {
@@ -531,6 +542,85 @@ const composeFormatConfig = (format: Format): RsbuildConfig => {
   }
 };
 
+const resolveShims = (shims?: Shims) => {
+  const resolvedShims = {
+    cjs: {
+      'import.meta.url': true,
+    },
+    esm: {
+      __filename: true,
+      __dirname: true,
+      require: false,
+    },
+  };
+
+  if (!shims) {
+    return resolvedShims;
+  }
+
+  if (shims.cjs) {
+    if (typeof shims.cjs === 'boolean') {
+      if (shims.cjs === true) {
+        resolvedShims.cjs['import.meta.url'] = true;
+      } else {
+        resolvedShims.cjs['import.meta.url'] = false;
+      }
+    } else {
+      resolvedShims.cjs['import.meta.url'] =
+        shims.cjs['import.meta.url'] ?? false;
+    }
+  }
+
+  if (shims.esm) {
+    if (typeof shims.esm === 'boolean') {
+      if (shims.esm === true) {
+        resolvedShims.esm.__filename = true;
+        resolvedShims.esm.__dirname = true;
+        resolvedShims.esm.require = true;
+      }
+    } else {
+      resolvedShims.esm.__filename = shims.esm.__filename ?? false;
+      resolvedShims.esm.__dirname = shims.esm.__dirname ?? false;
+      resolvedShims.esm.require = shims.esm.require ?? false;
+    }
+  }
+
+  return resolvedShims;
+};
+
+const composeShimsConfig = (
+  format: Format,
+  resolvedShims: ResolvedShims,
+): RsbuildConfig => {
+  switch (format) {
+    case 'esm':
+      return {
+        tools: {
+          rspack: {
+            node: {
+              // "__dirname" and "__filename" shims will automatically be enabled when `output.module` is `true`
+              __dirname: resolvedShims.esm.__dirname ? 'node-module' : false,
+              __filename: resolvedShims.esm.__filename ? 'node-module' : false,
+            },
+          },
+        },
+        plugins: [resolvedShims.esm.require && pluginEsmRequireShim()].filter(
+          Boolean,
+        ),
+      };
+    case 'cjs':
+      return {
+        plugins: [
+          resolvedShims.cjs['import.meta.url'] && pluginCjsImportMetaUrlShim(),
+        ].filter(Boolean),
+      };
+    case 'umd':
+      return {};
+    default:
+      throw new Error(`Unsupported format: ${format}`);
+  }
+};
+
 export const composeModuleImportWarn = (request: string): string => {
   return `The externalized commonjs request ${color.green(`"${request}"`)} will use ${color.blue('"module"')} external type in ESM format. If you want to specify other external type, considering set the request and type with ${color.blue('"output.externals"')}.`;
 };
@@ -832,9 +922,6 @@ const composeTargetConfig = (
         tools: {
           rspack: {
             target: ['node'],
-            // "__dirname" and "__filename" shims will automatically be enabled when `output.module` is `true`,
-            // and leave them as-is in the rest of the cases. Leave the comments here to explain the behavior.
-            // { node: { __dirname: ..., __filename: ... } }
           },
         },
         output: {
@@ -915,6 +1002,8 @@ async function composeLibRsbuildConfig(config: LibConfig, configPath: string) {
     externalHelpers = false,
     redirect = {},
   } = config;
+  const resolvedShims = resolveShims(config.shims);
+  const shimsConfig = composeShimsConfig(format!, resolvedShims);
   const formatConfig = composeFormatConfig(format!);
   const externalHelpersConfig = composeExternalHelpersConfig(
     externalHelpers,
@@ -967,6 +1056,7 @@ async function composeLibRsbuildConfig(config: LibConfig, configPath: string) {
 
   return mergeRsbuildConfig(
     formatConfig,
+    shimsConfig,
     externalHelpersConfig,
     // externalsWarnConfig should before other externals config
     externalsWarnConfig,
@@ -1046,6 +1136,7 @@ export async function composeCreateRsbuildConfig(
           'banner',
           'footer',
           'dts',
+          'shims',
         ]),
       ),
     };

packages/core/src/plugins/cjsShim.ts → packages/core/src/plugins/shims.ts

@@ -1,4 +1,4 @@
-import type { RsbuildPlugin } from '@rsbuild/core';
+import { type RsbuildPlugin, rspack } from '@rsbuild/core';
 
 const importMetaUrlShim = `/*#__PURE__*/ (function () {
   return typeof document === 'undefined'
@@ -11,9 +11,8 @@ const importMetaUrlShim = `/*#__PURE__*/ (function () {
 // - Replace `import.meta.url` with `importMetaUrl`.
 // - Inject `importMetaUrl` to the end of the module (can't inject at the beginning because of `"use strict";`).
 // This is a short-term solution, and we hope to provide built-in polyfills like `node.__filename` on Rspack side.
-export const pluginCjsShim = (): RsbuildPlugin => ({
+export const pluginCjsImportMetaUrlShim = (): RsbuildPlugin => ({
   name: 'rsbuild-plugin-cjs-shim',
-
   setup(api) {
     api.modifyEnvironmentConfig((config) => {
       config.source.define = {
@@ -23,3 +22,26 @@ export const pluginCjsShim = (): RsbuildPlugin => ({
     });
   },
 });
+
+const requireShim = `// Rslib ESM shims
+import __rslib_shim_module__ from 'module';
+const require = /*#__PURE__*/ __rslib_shim_module__.createRequire(import.meta.url);
+`;
+
+export const pluginEsmRequireShim = (): RsbuildPlugin => ({
+  name: 'rsbuild-plugin-esm-shim',
+  setup(api) {
+    api.modifyRspackConfig((config) => {
+      config.plugins ??= [];
+      config.plugins.push(
+        new rspack.BannerPlugin({
+          banner: requireShim,
+          // Just before minify stage, to perform tree shaking.
+          stage: rspack.Compilation.PROCESS_ASSETS_STAGE_OPTIMIZE - 1,
+          raw: true,
+          include: /\.(js|cjs)$/,
+        }),
+      );
+    });
+  },
+});

packages/core/src/types/config/index.ts

@@ -48,6 +48,26 @@ export type BannerAndFooter = {
   dts?: string;
 };
 
+export type Shims = {
+  cjs?:
+    | boolean
+    | {
+        'import.meta.url'?: boolean;
+      };
+  esm?:
+    | boolean
+    | {
+        __filename?: boolean;
+        __dirname?: boolean;
+        require?: boolean;
+      };
+};
+
+export type ResolvedShims = {
+  cjs: Required<NonNullable<Exclude<Shims['cjs'], boolean>>>;
+  esm: Required<NonNullable<Exclude<Shims['esm'], boolean>>>;
+};
+
 export type Redirect = {
   // TODO: support other redirects
   // alias?: boolean;
@@ -67,6 +87,7 @@ export interface LibConfig extends RsbuildConfig {
   externalHelpers?: boolean;
   banner?: BannerAndFooter;
   footer?: BannerAndFooter;
+  shims?: Shims;
   dts?: Dts;
 }
 

packages/core/tests/__snapshots__/config.test.ts.snap

@@ -48,6 +48,7 @@ exports[`Should compose create Rsbuild config correctly > Merge Rsbuild config 1
           "not dead",
         ],
       },
+      "plugins": [],
       "source": {
         "alias": {
           "bar": "bar",
@@ -110,6 +111,10 @@ exports[`Should compose create Rsbuild config correctly > Merge Rsbuild config 1
                 },
               },
             },
+            "node": {
+              "__dirname": "node-module",
+              "__filename": "node-module",
+            },
             "optimization": {
               "concatenateModules": true,
               "sideEffects": "flag",

tests/benchmark/index.bench.ts

@@ -6,23 +6,23 @@ describe('run rslib in examples', () => {
     'examples/express-plugin',
     async () => {
       const cwd = getCwdByExample('express-plugin');
-      await rslibBuild(cwd);
+      await rslibBuild({ cwd });
     },
     { time: 5 },
   );
   bench(
     'examples/react-component-bundle',
     async () => {
       const cwd = getCwdByExample('react-component-bundle');
-      await rslibBuild(cwd);
+      await rslibBuild({ cwd });
     },
     { time: 5 },
   );
   bench(
     'examples/react-component-bundle-false',
     async () => {
       const cwd = getCwdByExample('react-component-bundle-false');
-      await rslibBuild(cwd);
+      await rslibBuild({ cwd });
     },
     { time: 5 },
   );

tests/integration/alias/index.test.ts

@@ -3,7 +3,7 @@ import { expect, test } from 'vitest';
 
 test('source.alias', async () => {
   const fixturePath = __dirname;
-  const { entries } = await buildAndGetResults(fixturePath);
+  const { entries } = await buildAndGetResults({ fixturePath });
 
   expect(entries.esm).toContain('hello world');
   expect(entries.cjs).toContain('hello world');

tests/integration/asset/index.test.ts

@@ -4,7 +4,7 @@ import { expect, test } from 'vitest';
 
 test('set the size threshold to inline static assets', async () => {
   const fixturePath = join(__dirname, 'limit');
-  const { contents } = await buildAndGetResults(fixturePath);
+  const { contents } = await buildAndGetResults({ fixturePath });
 
   // inline when bundle
   expect(Object.values(contents.esm0!)[0]).toContain(
@@ -29,7 +29,7 @@ test('set the size threshold to inline static assets', async () => {
 
 test('set the assets name', async () => {
   const fixturePath = join(__dirname, 'name');
-  const { contents } = await buildAndGetResults(fixturePath);
+  const { contents } = await buildAndGetResults({ fixturePath });
 
   // bundle
   expect(Object.values(contents.esm0!)[0]).toContain(
@@ -44,7 +44,7 @@ test('set the assets name', async () => {
 
 test('set the assets output path', async () => {
   const fixturePath = join(__dirname, 'path');
-  const { contents } = await buildAndGetResults(fixturePath);
+  const { contents } = await buildAndGetResults({ fixturePath });
 
   // bundle
   expect(Object.values(contents.esm0!)[0]).toContain(
@@ -59,7 +59,7 @@ test('set the assets output path', async () => {
 
 test('set the assets public path', async () => {
   const fixturePath = join(__dirname, 'public-path');
-  const { contents } = await buildAndGetResults(fixturePath);
+  const { contents } = await buildAndGetResults({ fixturePath });
 
   // bundle
   expect(Object.values(contents.esm0!)[0]).toContain(
@@ -74,7 +74,7 @@ test('set the assets public path', async () => {
 
 test('use svgr', async () => {
   const fixturePath = join(__dirname, 'svgr');
-  const { contents } = await buildAndGetResults(fixturePath);
+  const { contents } = await buildAndGetResults({ fixturePath });
 
   // bundle -- default export with react query
   expect(Object.values(contents.esm0!)[0]).toMatchSnapshot();

tests/integration/async-chunks/index.test.ts

@@ -4,7 +4,7 @@ import { expect, test } from 'vitest';
 
 test('should get correct value from async chunks', async () => {
   const fixturePath = join(__dirname, 'default');
-  const { entryFiles } = await buildAndGetResults(fixturePath);
+  const { entryFiles } = await buildAndGetResults({ fixturePath });
 
   for (const format of ['esm', 'cjs']) {
     const { foo } = await import(entryFiles[format]);