feat(pluginutils): add native node es modules support

Ref #412 #413 Enable native node es modules via "exports" field in package.json. Added custom plugin to generate nested package.json with `{"type": "module"}` to prevent mjs extension usage.
rollup · May 26, 2020 · 8103ad4 · 8103ad4
1 parent 867c699
commit 8103ad4
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Showing 2 changed files with 22 additions and 11 deletions.
diff --git a/packages/pluginutils/package.json b/packages/pluginutils/package.json
@@ -12,7 +12,7 @@
   "bugs": {
     "url": "https://github.com/rollup/plugins/issues"
   },
-  "main": "dist/index.js",
+  "main": "./dist/cjs/index.js",
   "engines": {
     "node": ">= 8.0.0"
   },
@@ -75,12 +75,17 @@
       "!**/types.ts"
     ]
   },
-  "module": "dist/index.es.js",
+  "exports": {
+    "require": "./dist/cjs/index.js",
+    "import": "./dist/es/index.js"
+  },
+  "module": "./dist/es/index.js",
   "nyc": {
     "extension": [
       ".js",
       ".ts"
     ]
   },
+  "type": "commonjs",
   "types": "types/index.d.ts"
 }
diff --git a/packages/pluginutils/rollup.config.js b/packages/pluginutils/rollup.config.js
@@ -4,6 +4,19 @@ import typescript from '@rollup/plugin-typescript';
 
 import pkg from './package.json';
 
+function emitModulePackageFile() {
+  return {
+    name: 'emit-module-package-file',
+    generateBundle() {
+      this.emitFile({
+        type: 'asset',
+        fileName: 'package.json',
+        source: `{"type":"module"}`
+      });
+    }
+  };
+}
+
 export default {
   input: 'src/index.ts',
   plugins: [
@@ -13,14 +26,7 @@ export default {
   ],
   external: Object.keys(pkg.dependencies).concat('path', 'util'),
   output: [
-    {
-      format: 'cjs',
-      file: pkg.main,
-      exports: 'named'
-    },
-    {
-      format: 'es',
-      file: pkg.module
-    }
+    { format: 'cjs', file: pkg.main, exports: 'named' },
+    { file: pkg.module, format: 'es', plugins: [emitModulePackageFile()] }
   ]
 };