external module deshadowing

src/Statement.js

@@ -239,6 +239,12 @@ export default class Statement {
 		const replacementStack = [ names ];
 		const nameList = keys( names );
 
+		let deshadowList = [];
+		nameList.forEach( name => {
+			const replacement = names[ name ];
+			deshadowList.push( replacement.split( '.' )[0] );
+		});
+
 		if ( nameList.length > 0 ) {
 			walk( this.node, {
 				enter ( node, parent ) {
@@ -248,13 +254,20 @@ export default class Statement {
 						let newNames = {};
 						let hasReplacements;
 
-						nameList.forEach( key => {
+						keys( names ).forEach( key => {
 							if ( !~scope.names.indexOf( key ) ) {
 								newNames[ key ] = names[ key ];
 								hasReplacements = true;
 							}
 						});
 
+						deshadowList.forEach( name => {
+							if ( ~scope.names.indexOf( name ) ) {
+								newNames[ name ] = name + '$$'; // TODO better mechanism
+								hasReplacements = true;
+							}
+						});
+
 						if ( !hasReplacements ) {
 							return this.skip();
 						}

src/finalisers/iife.js

@@ -1,4 +1,4 @@
-export default function es6 ( bundle, magicString, exportMode, options ) {
+export default function iife ( bundle, magicString, exportMode, options ) {
 
 	const intro = `(function () { 'use strict';\n\n`;
 	const outro = `\n\n})();`;

test/function/shadowed-external-export/_config.js

@@ -1,4 +1,3 @@
 module.exports = {
-	description: 'external modules are not shadowed',
-	skip: true
+	description: 'external modules are not shadowed'
 };