Use named "polyfill" export and support ES module target

README.md

@@ -22,7 +22,7 @@ Next, update your component and replace any of the deprecated lifecycles with ne
 Lastly, use the polyfill to make the new lifecycles work with older versions of React:
 ```js
 import React from 'react';
-import polyfill from 'react-lifecycles-compat';
+import {polyfill} from 'react-lifecycles-compat';
 
 class ExampleComponent extends React.Component {
   // ...

index.js

@@ -47,7 +47,7 @@ componentWillMount.__suppressDeprecationWarning = true;
 componentWillReceiveProps.__suppressDeprecationWarning = true;
 componentWillUpdate.__suppressDeprecationWarning = true;
 
-export default function polyfill(Component) {
+export function polyfill(Component) {
   if (!Component.prototype || !Component.prototype.isReactComponent) {
     throw new Error('Can only polyfill class components');
   }

package.json

@@ -1,8 +1,9 @@
 {
   "name": "react-lifecycles-compat",
-  "version": "1.1.3",
+  "version": "2.0.0",
   "description": "Backwards compatibility polyfill for React class components",
   "main": "react-lifecycles-compat.cjs.js",
+  "module": "react-lifecycles-compat.es.js",
   "license": "MIT",
   "repository": "reactjs/react-lifecycles-compat",
   "scripts": {
@@ -16,6 +17,7 @@
   },
   "files": [
     "react-lifecycles-compat.cjs.js",
+    "react-lifecycles-compat.es.js",
     "react-lifecycles-compat.js",
     "react-lifecycles-compat.min.js"
   ],

rollup.config.js

@@ -24,7 +24,7 @@ export default [
   createConfig({
     output: [
       { file: pkg.main, format: 'cjs' },
-      // Re-enable for 2.0 { file: pkg.module, format: 'es' },
+      { file: pkg.module, format: 'es' },
     ],
   }),
   createConfig({

test.js

@@ -9,17 +9,19 @@ const POLYFILLS = {
   'umd: prod': require('./react-lifecycles-compat.min'),
 };
 
-Object.entries(POLYFILLS).forEach(([name, polyfill]) => {
+Object.entries(POLYFILLS).forEach(([name, module]) => {
   describe(`react-lifecycles-compat (${name})`, () => {
     readdirSync(join(__dirname, 'react')).forEach(version => {
       const basePath = `./react/${version}/node_modules/`;
 
       let createReactClass;
+      let polyfill;
       let React;
       let ReactDOM;
 
-      beforeEach(() => {
+      beforeAll(() => {
         createReactClass = require(basePath + 'create-react-class');
+        polyfill = module.polyfill;
         React = require(basePath + 'react');
         ReactDOM = require(basePath + 'react-dom');
       });