fix: correct detect transformed module external request

Author: fi3ework

packages/core/src/config.ts

@@ -141,6 +141,39 @@ export async function loadConfig({
   return { content: content as RslibConfig, filePath: configFilePath };
 }
 
+// Match logic is derived from https://github.com/webpack/webpack/blob/94aba382eccf3de1004d235045d4462918dfdbb7/lib/ExternalModuleFactoryPlugin.js#L89-L158
+const handleMatchedExternal = (
+  value: string | string[] | boolean | Record<string, string | string[]>,
+  request: string,
+): boolean => {
+  if (typeof value === 'boolean') {
+    return value;
+  }
+
+  if (typeof value === 'string') {
+    const [first, second] = value.split(' ');
+    const hasType = !!second;
+    const _request = second ? second : first;
+
+    // Don't need to warn explicit declared external type.
+    if (!hasType) {
+      return request === _request;
+    }
+
+    return false;
+  }
+
+  if (Array.isArray(value)) {
+    return handleMatchedExternal(value[0] ?? '', request);
+  }
+
+  if (typeof value === 'object') {
+    return false;
+  }
+
+  return false;
+};
+
 const composeExternalsWarnConfig = (
   format: Format,
   ...externalsArray: NonNullable<EnvironmentConfig['output']>['externals'][]
@@ -165,12 +198,15 @@ const composeExternalsWarnConfig = (
     request: string,
     callback: (matched?: true) => void,
   ) => {
+    // string
     if (typeof externals === 'string') {
-      if (externals === request) {
+      if (handleMatchedExternal(externals, request)) {
         callback(true);
         return;
       }
-    } else if (Array.isArray(externals)) {
+    }
+    // array
+    if (Array.isArray(externals)) {
       let i = 0;
       const next = () => {
         let asyncFlag: boolean;
@@ -202,16 +238,24 @@ const composeExternalsWarnConfig = (
 
       next();
       return;
-    } else if (externals instanceof RegExp) {
+    }
+    // regexp
+    if (externals instanceof RegExp) {
       if (externals.test(request)) {
         callback(true);
         return;
       }
-    } else if (typeof externals === 'function') {
+    }
+    // function
+    else if (typeof externals === 'function') {
       // TODO: Support function
-    } else if (typeof externals === 'object') {
+    }
+    // object
+    else if (typeof externals === 'object') {
       if (Object.prototype.hasOwnProperty.call(externals, request)) {
-        callback(true);
+        if (handleMatchedExternal(externals[request]!, request)) {
+          callback(true);
+        }
         return;
       }
     }
@@ -1449,8 +1493,8 @@ async function composeLibRsbuildConfig(
   const dtsConfig = await composeDtsConfig(config, dtsExtension);
   const externalsWarnConfig = composeExternalsWarnConfig(
     format!,
-    autoExternalConfig?.output?.externals,
     userExternalsConfig?.output?.externals,
+    autoExternalConfig?.output?.externals,
   );
   const minifyConfig = composeMinifyConfig(config);
   const bannerFooterConfig = composeBannerFooterConfig(banner, footer);

pnpm-lock.yaml

@@ -89,15 +89,21 @@ test('should get warn when use require in ESM', async () => {
   const { entries } = await buildAndGetResults({ fixturePath });
   const logStrings = logs.map((log) => stripAnsi(log));
 
-  expect(entries.esm).toContain(
-    'import * as __WEBPACK_EXTERNAL_MODULE_react__ from "react"',
-  );
-
-  expect(
-    logStrings.some((l) =>
-      l.includes(stripAnsi(composeModuleImportWarn('react'))),
-    ),
-  ).toBe(true);
+  const moduleExternalized = ['react', 'e2', 'e3', 'e5', 'e6', 'e7'];
+
+  for (const item of moduleExternalized) {
+    expect(entries.esm).toContain(
+      `import * as __WEBPACK_EXTERNAL_MODULE_${item}__ from "${item}"`,
+    );
+  }
+
+  for (const item of moduleExternalized) {
+    expect(
+      logStrings.some((l) =>
+        l.includes(stripAnsi(composeModuleImportWarn(item))),
+      ),
+    ).toBe(true);
+  }
 
   restore();
 });

tests/integration/auto-external/index.test.ts

@@ -2,6 +2,7 @@
   "name": "module-import-warn",
   "private": true,
   "dependencies": {
+    "lodash": "^4.17.21",
     "react": "^19.0.0"
   }
 }

tests/integration/auto-external/module-import-warn/package.json

@@ -8,4 +8,19 @@ export default defineConfig({
       index: './src/index.ts',
     },
   },
+  output: {
+    externals: [
+      {
+        e1: 'commonjs e1',
+        e2: 'e2',
+        e3: true,
+        e4: ['commonjs e4'],
+        e5: ['e5'],
+        'lodash/add': false,
+        e8: ['module e8'],
+      },
+      /e6/,
+      'e7',
+    ],
+  },
 });

tests/integration/auto-external/module-import-warn/rslib.config.ts

@@ -1,4 +1,13 @@
 export const foo = () => {
   const React = require('react');
-  return React.version;
+  const e1 = require('e1');
+  const e2 = require('e2');
+  const e3 = require('e3');
+  const e4 = require('e4');
+  const e5 = require('e5');
+  const e6 = require('e6');
+  const e7 = require('e7');
+  const e8 = require('e8');
+  const add = require('lodash/add');
+  return React.version + e1 + e2 + e3 + e4 + e5 + e6 + e7 + e8 + add;
 };