WIP: more complete CJS <-> ES interop

src/index.js

@@ -49,8 +49,10 @@ const HELPERS_ID = '\0commonjsHelpers';
 const HELPERS = `
 export var commonjsGlobal = typeof window !== 'undefined' ? window : typeof global !== 'undefined' ? global : typeof self !== 'undefined' ? self : {}
 
-export function interopDefault(ex) {
-	return ex && typeof ex === 'object' && 'default' in ex ? ex['default'] : ex;
+export function interopDefault(x) {
+	if ( !x || typeof x !== 'object' || !x.default ) return x;
+	if ( typeof x['default'] === 'object' || typeof x['default'] === 'function' ) x['default']['default'] = x['default'];
+	return x['default'];
 }
 
 export function createCommonjsModule(fn, module) {
@@ -125,7 +127,7 @@ export default function commonjs ( options = {} ) {
 			// Because objects have no guaranteed ordering, yet we need it,
 			// we need to keep track of the order in a array
 			let sources = [];
-			
+
 			let uid = 0;
 
 			let scope = attachScopes( ast, 'scope' );

test/samples/react-apollo/commonjs-bar.js

@@ -0,0 +1,6 @@
+function Bar () {
+	this.x = 42;
+}
+
+exports.__esModule = true;
+exports.default = Bar;

test/samples/react-apollo/commonjs-foo.js

@@ -0,0 +1,4 @@
+var Bar = require( './commonjs-bar' );
+
+exports.__esModule = true;
+exports.Bar = Bar.default;

test/samples/react-apollo/main.js

@@ -0,0 +1,3 @@
+import { Bar } from './commonjs-foo.js';
+
+assert.equal( new Bar().x, 42 );

test/test.js

@@ -370,4 +370,11 @@ describe( 'rollup-plugin-commonjs', () => {
 			plugins: [ commonjs() ]
 		}).then( executeBundle );
 	});
+
+	it( 'does not remove .default properties', () => {
+		return rollup({
+			entry: 'samples/react-apollo/main.js',
+			plugins: [ commonjs() ]
+		}).then( executeBundle );
+	});
 });