fix(legacy): prepare for Rollup 3

BREAKING CHANGES: Requires Node 14

packages/legacy/README.md

@@ -13,7 +13,7 @@
 
 ## Requirements
 
-This plugin requires an [LTS](https://github.com/nodejs/Release) Node version (v8.0.0+) and Rollup v1.20.0+.
+This plugin requires an [LTS](https://github.com/nodejs/Release) Node version (v14.0.0+) and Rollup v1.20.0+.
 
 ## Install
 

packages/legacy/package.json

@@ -13,8 +13,16 @@
   "author": "Rich Harris",
   "homepage": "https://github.com/rollup/plugins/tree/master/packages/legacy/#readme",
   "bugs": "https://github.com/rollup/plugins/issues",
-  "main": "dist/index.js",
-  "module": "dist/index.es.js",
+  "main": "./dist/cjs/index.js",
+  "module": "./dist/es/index.js",
+  "exports": {
+    "types": "./types/index.d.ts",
+    "import": "./dist/es/index.js",
+    "default": "./dist/cjs/index.js"
+  },
+  "engines": {
+    "node": ">=14.0.0"
+  },
   "scripts": {
     "build": "rollup -c",
     "ci:coverage": "nyc pnpm test && nyc report --reporter=text-lcov > coverage.lcov",
@@ -30,6 +38,7 @@
   },
   "files": [
     "dist",
+    "!dist/**/*.map",
     "types",
     "README.md",
     "LICENSE"
@@ -39,20 +48,24 @@
     "plugin"
   ],
   "peerDependencies": {
-    "rollup": "^1.20.0||^2.0.0"
+    "rollup": "^1.20.0||^2.0.0||^3.0.0"
+  },
+  "peerDependenciesMeta": {
+    "rollup": {
+      "optional": true
+    }
   },
   "dependencies": {
-    "@rollup/pluginutils": "^4.1.0"
+    "@rollup/pluginutils": "^4.2.1"
   },
   "devDependencies": {
     "@rollup/plugin-buble": "^0.21.3",
-    "del-cli": "^3.0.1",
-    "rollup": "^2.67.3"
+    "del-cli": "^5.0.0",
+    "rollup": "^3.0.0-7"
   },
+  "types": "./types/index.d.ts",
   "ava": {
-    "babel": {
-      "compileEnhancements": false
-    },
+    "workerThreads": false,
     "files": [
       "!**/fixtures/**",
       "!**/helpers/**",

packages/legacy/rollup.config.mjs

@@ -0,0 +1,13 @@
+import { readFileSync } from 'fs';
+
+import buble from '@rollup/plugin-buble';
+
+import { createConfig } from '../../shared/rollup.config.mjs';
+
+export default {
+  ...createConfig({
+    pkg: JSON.parse(readFileSync(new URL('./package.json', import.meta.url), 'utf8'))
+  }),
+  input: 'src/index.js',
+  plugins: [buble()]
+};