fix(modernjs)!: ship .mjs files for correct ESM output (#4240)

Author: fi3ework

.changeset/brave-beans-exist.md

@@ -0,0 +1,5 @@
+---
+'@module-federation/modern-js': minor
+---
+
+fix(modernjs)!: ship .mjs files for correct ESM output

packages/modernjs/modern.config.ts

@@ -10,7 +10,7 @@
     "access": "public"
   },
   "scripts": {
-    "build": "modern-module build"
+    "build": "rslib build"
   },
   "repository": {
     "type": "git",
@@ -20,60 +20,60 @@
   "exports": {
     ".": {
       "types": "./dist/types/cli/index.d.ts",
-      "import": "./dist/esm/cli/index.js",
+      "import": "./dist/esm/cli/index.mjs",
       "require": "./dist/cjs/cli/index.js"
     },
     "./runtime": {
       "types": "./dist/types/runtime/index.d.ts",
-      "default": "./dist/esm/runtime/index.js"
+      "default": "./dist/esm/runtime/index.mjs"
     },
     "./react": {
       "types": "./dist/types/react/index.d.ts",
-      "default": "./dist/esm/react/index.js"
+      "default": "./dist/esm/react/index.mjs"
     },
     "./react-v18": {
       "types": "./dist/types/react/v18.d.ts",
-      "default": "./dist/esm/react/v18.js"
+      "default": "./dist/esm/react/v18.mjs"
     },
     "./react-v19": {
       "types": "./dist/types/react/v19.d.ts",
-      "default": "./dist/esm/react/v19.js"
+      "default": "./dist/esm/react/v19.mjs"
     },
     "./react-plugin": {
       "types": "./dist/types/react/plugin.d.ts",
-      "default": "./dist/esm/react/plugin.js"
+      "default": "./dist/esm/react/plugin.mjs"
     },
     "./ssr-dev-plugin": {
       "types": "./dist/types/ssr-runtime/devPlugin.d.ts",
-      "default": "./dist/esm/ssr-runtime/devPlugin.js"
+      "default": "./dist/esm/ssr-runtime/devPlugin.mjs"
     },
     "./ssr-inject-data-fetch-function-plugin": {
       "types": "./dist/types/ssr-runtime/injectDataFetchFunctionPlugin.d.ts",
-      "default": "./dist/esm/ssr-runtime/injectDataFetchFunctionPlugin.js"
+      "default": "./dist/esm/ssr-runtime/injectDataFetchFunctionPlugin.mjs"
     },
     "./config-plugin": {
       "types": "./dist/types/cli/configPlugin.d.ts",
-      "import": "./dist/esm/cli/configPlugin.js",
+      "import": "./dist/esm/cli/configPlugin.mjs",
       "require": "./dist/cjs/cli/configPlugin.js"
     },
     "./ssr-plugin": {
       "types": "./dist/types/cli/ssrPlugin.d.ts",
-      "import": "./dist/esm/cli/ssrPlugin.js",
+      "import": "./dist/esm/cli/ssrPlugin.mjs",
       "require": "./dist/cjs/cli/ssrPlugin.js"
     },
     "./shared-strategy": {
       "types": "./dist/types/cli/mfRuntimePlugins/shared-strategy.d.ts",
-      "import": "./dist/esm/cli/mfRuntimePlugins/shared-strategy.js",
+      "import": "./dist/esm/cli/mfRuntimePlugins/shared-strategy.mjs",
       "require": "./dist/cjs/cli/mfRuntimePlugins/shared-strategy.js"
     },
     "./resolve-entry-ipv4": {
       "types": "./dist/types/cli/mfRuntimePlugins/resolve-entry-ipv4.d.ts",
-      "import": "./dist/esm/cli/mfRuntimePlugins/resolve-entry-ipv4.js",
+      "import": "./dist/esm/cli/mfRuntimePlugins/resolve-entry-ipv4.mjs",
       "require": "./dist/cjs/cli/mfRuntimePlugins/resolve-entry-ipv4.js"
     },
     "./inject-node-fetch": {
       "types": "./dist/types/cli/mfRuntimePlugins/inject-node-fetch.d.ts",
-      "import": "./dist/esm/cli/mfRuntimePlugins/inject-node-fetch.js",
+      "import": "./dist/esm/cli/mfRuntimePlugins/inject-node-fetch.mjs",
       "require": "./dist/cjs/cli/mfRuntimePlugins/inject-node-fetch.js"
     },
     "./data-fetch-server-plugin": {
@@ -153,6 +153,7 @@
   },
   "devDependencies": {
     "@module-federation/manifest": "workspace:*",
+    "@rslib/core": "^0.18.1",
     "@modern-js/core": "2.68.2",
     "@rsbuild/core": "1.3.21",
     "@modern-js/app-tools": "2.68.2",

packages/modernjs/package.json

@@ -0,0 +1,52 @@
+import { defineConfig } from '@rslib/core';
+
+const sharedLibOptions = {
+  bundle: false,
+  externalHelpers: true,
+  outBase: 'src',
+} as const;
+
+export default defineConfig({
+  source: {
+    entry: {
+      index: ['./src/**/*.{ts,tsx,js,jsx}', '!./src/**/*.spec.*'],
+    },
+  },
+  lib: [
+    {
+      ...sharedLibOptions,
+      format: 'cjs',
+      syntax: 'es2019',
+      dts: false,
+      output: {
+        distPath: {
+          root: './dist/cjs',
+        },
+      },
+    },
+    {
+      ...sharedLibOptions,
+      format: 'esm',
+      syntax: 'es5',
+      dts: false,
+      output: {
+        distPath: {
+          root: './dist/esm',
+        },
+      },
+    },
+    {
+      ...sharedLibOptions,
+      format: 'esm',
+      syntax: 'es2019',
+      dts: {
+        distPath: './dist/types',
+      },
+      output: {
+        distPath: {
+          root: './dist/esm-node',
+        },
+      },
+    },
+  ],
+});