fix export * from external bug

src/Bundle.js

@@ -216,6 +216,8 @@ export default class Bundle {
 					module.exportAllSources.forEach( source => {
 						const id = module.resolvedIds[ source ];
 						const exportAllModule = this.moduleById.get( id );
+						if ( exportAllModule.isExternal ) return;
+
 						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 ]}.` );

test/function/export-all-from-external/_config.js

@@ -0,0 +1,6 @@
+module.exports = {
+	description: 'allows `export *` from external module, internally',
+	options: {
+		external: [ 'path' ]
+	}
+};

test/function/export-all-from-external/main.js

@@ -0,0 +1,4 @@
+import { dirname, isRelative } from './path-plus.js';
+
+assert.equal( dirname( 'foo/bar' ), 'foo' );
+assert.ok( isRelative( './foo' ) );

test/function/export-all-from-external/path-plus.js

@@ -0,0 +1,5 @@
+export * from 'path';
+
+export function isRelative ( path ) {
+	return path[0] === '.';
+}