Merge branch 'fail-exports-all-dup'

src/Bundle.js

@@ -210,7 +210,23 @@ export default class Bundle {
 				this.modules.push( module );
 				this.moduleById.set( id, module );
 
-				return this.fetchAllDependencies( module ).then( () => module );
+				return this.fetchAllDependencies( module ).then( () => {
+					module.exportsAll = blank();
+					keys( module.exports ).forEach( name => {
+						module.exportsAll[name] = module.id;
+					});
+					module.exportAllSources.forEach( source => {
+						const id = module.resolvedIds[ source ];
+						const exportAllModule = this.moduleById.get( id );
+						keys( exportAllModule.exportsAll ).forEach( name => {
+							if ( name in module.exportsAll ) {
+								this.onwarn( `Conflicting namespaces: ${module.id} re-exports '${name}' from both ${module.exportsAll[ name ]} (will be ignored) and ${exportAllModule.exportsAll[ name ]}.` );
+							}
+							module.exportsAll[ name ] = exportAllModule.exportsAll[ name ];
+						});
+					});
+					return module;
+				});
 			});
 	}
 

test/function/double-named-export-from/_config.js

@@ -0,0 +1,15 @@
+const path = require('path');
+const assert = require( 'assert' );
+
+function normalize ( file ) {
+	return path.resolve( __dirname, file ).split( '\\' ).join( '/' );
+}
+
+module.exports = {
+	description: 'throws on duplicate export * from',
+	warnings ( warnings ) {
+		assert.deepEqual( warnings, [
+			`Conflicting namespaces: ${normalize('main.js')} re-exports 'foo' from both ${normalize('foo.js')} (will be ignored) and ${normalize('deep.js')}.`
+		]);
+	}
+};

test/function/double-named-export-from/bar.js

@@ -0,0 +1 @@
+export * from './deep.js';

test/function/double-named-export-from/deep.js

@@ -0,0 +1 @@
+export var foo = 2;

test/function/double-named-export-from/foo.js

@@ -0,0 +1 @@
+export var foo = 1;

test/function/double-named-export-from/main.js

@@ -0,0 +1,2 @@
+export * from './foo.js';
+export * from './bar.js';