fix: correct ESM interop

packages/core/package.json

@@ -55,6 +55,7 @@
     "chokidar": "^4.0.3",
     "fs-extra": "^11.3.1",
     "memfs": "^4.38.1",
+    "path-serializer": "0.5.1",
     "picocolors": "1.1.1",
     "prebundle": "1.4.1",
     "rsbuild-plugin-publint": "^0.3.3",

packages/core/rstest.config.ts

@@ -4,4 +4,5 @@ import { shared } from '../../rstest.workspace';
 export default defineConfig({
   ...shared,
   name: 'unit',
+  setupFiles: ['./setupRstestTests.ts'],
 });

packages/core/setupRstestTests.ts

@@ -0,0 +1,40 @@
+import path from 'node:path';
+import process from 'node:process';
+import { beforeEach, expect } from '@rstest/core';
+import { createSnapshotSerializer } from 'path-serializer';
+
+beforeEach(() => {
+  // since our NODE_ENV injection logic is via cli, we need to
+  // delete "test" NODE_ENV to avoid affecting the default build config
+  delete process.env.NODE_ENV;
+});
+
+function removeTrailingSlash(inputPath: string): string {
+  return path.normalize(inputPath).replace(/[\\/]+$/, '');
+}
+expect.addSnapshotSerializer(
+  createSnapshotSerializer({
+    root: removeTrailingSlash(path.join(__dirname, '../../')),
+    workspace: __dirname,
+    features: {
+      replaceHomeDir: false,
+      replaceWorkspace: true,
+      replaceRoot: true,
+      escapeDoubleQuotes: false,
+      transformCLR: false,
+    },
+  }),
+);
+
+if (process.env.ECO_CI) {
+  expect.extend({
+    toMatchSnapshot: () => ({
+      pass: true,
+      message: () => 'Snapshot always passes',
+    }),
+    toMatchInlineSnapshot: () => ({
+      pass: true,
+      message: () => 'Snapshot always passes',
+    }),
+  });
+}

packages/core/src/config.ts

@@ -818,6 +818,16 @@ const disableUrlParseRsbuildPlugin = (): RsbuildPlugin => ({
   },
 });
 
+// Port https://github.com/web-infra-dev/rsbuild/pull/5955 before it merged into Rsbuild.
+const fixJsModuleTypePlugin = (): RsbuildPlugin => ({
+  name: 'rsbuild:fix-js-module-type',
+  setup(api) {
+    api.modifyBundlerChain((config, { CHAIN_ID }) => {
+      config.module.rule(CHAIN_ID.RULE.JS).delete('type');
+    });
+  },
+});
+
 const composeShimsConfig = (
   format: Format,
   shims?: Shims,
@@ -866,6 +876,7 @@ const composeShimsConfig = (
         plugins: [
           resolvedShims.esm.require && pluginEsmRequireShim(),
           disableUrlParseRsbuildPlugin(),
+          fixJsModuleTypePlugin(),
         ].filter(Boolean),
       };
       break;
@@ -875,12 +886,16 @@ const composeShimsConfig = (
         plugins: [
           resolvedShims.cjs['import.meta.url'] && pluginCjsImportMetaUrlShim(),
           disableUrlParseRsbuildPlugin(),
+          fixJsModuleTypePlugin(),
         ].filter(Boolean),
       };
       break;
     case 'umd':
     case 'iife':
     case 'mf':
+      rsbuildConfig = {
+        plugins: [fixJsModuleTypePlugin()],
+      };
       break;
     default:
       throw new Error(`Unsupported format: ${format}`);