Ensure namespace imports are not combined with other import types.

It is a syntax error to combine namespace import specifiers with named or default specifiers.

Fixes #355.

src/finalisers/es6.js

@@ -8,6 +8,7 @@ export default function es6 ( bundle, magicString ) {
 	const importBlock = bundle.externalModules
 		.map( module => {
 			const specifiers = [];
+			const specifiersList = [specifiers];
 			const importedNames = keys( module.declarations )
 				.filter( name => name !== '*' && name !== 'default' );
 
@@ -15,17 +16,26 @@ export default function es6 ( bundle, magicString ) {
 				specifiers.push( module.name );
 			}
 
-			if ( module.declarations['*'] ) {
+			const namespaceSpecifier = module.declarations['*'] ? `* as ${module.name}` : null;
-				specifiers.push( `* as ${module.name}` );
+			const namedSpecifier = importedNames.length ? `{ ${importedNames.join( ', ' )} }` : null;
-			}
 
-			if ( importedNames.length ) {
+			if ( namespaceSpecifier && namedSpecifier ) {
-				specifiers.push( `{ ${importedNames.join( ', ' )} }` );
+				// Namespace and named specifiers cannot be combined.
+				specifiersList.push( [namespaceSpecifier] );
+				specifiers.push( namedSpecifier );
+			} else if ( namedSpecifier ) {
+				specifiers.push( namedSpecifier );
+			} else if ( namespaceSpecifier ) {
+				specifiers.push( namespaceSpecifier );
 			}
 
-			return specifiers.length ?
+			return specifiersList
+				.map( specifiers =>
+					specifiers.length ?
 						`import ${specifiers.join( ', ' )} from '${module.id}';` :
-				`import '${module.id}';`;
+						`import '${module.id}';`
+				)
+				.join( '\n' );
 		})
 		.join( '\n' );
 

test/form/external-imports/_expected/amd.js

@@ -4,7 +4,7 @@ define(['factory', 'baz', 'shipping-port', 'alphabet'], function (factory, baz,
 	var alphabet__default = 'default' in alphabet ? alphabet['default'] : alphabet;
 
 	factory( null );
-	baz.foo( baz.bar );
+	baz.foo( baz.bar, containers.port );
 	containers.forEach( console.log, console );
 	console.log( alphabet.a );
 	console.log( alphabet__default.length );

test/form/external-imports/_expected/cjs.js

@@ -8,7 +8,7 @@ var alphabet = require('alphabet');
 var alphabet__default = 'default' in alphabet ? alphabet['default'] : alphabet;
 
 factory( null );
-baz.foo( baz.bar );
+baz.foo( baz.bar, containers.port );
 containers.forEach( console.log, console );
 console.log( alphabet.a );
 console.log( alphabet__default.length );

test/form/external-imports/_expected/es6.js

@@ -1,10 +1,11 @@
 import factory from 'factory';
 import { bar, foo } from 'baz';
+import { port } from 'shipping-port';
 import * as containers from 'shipping-port';
 import alphabet, { a } from 'alphabet';
 
 factory( null );
-foo( bar );
+foo( bar, port );
 containers.forEach( console.log, console );
 console.log( a );
 console.log( alphabet.length );

test/form/external-imports/_expected/iife.js

@@ -4,7 +4,7 @@
 	var alphabet__default = 'default' in alphabet ? alphabet['default'] : alphabet;
 
 	factory( null );
-	baz.foo( baz.bar );
+	baz.foo( baz.bar, containers.port );
 	containers.forEach( console.log, console );
 	console.log( alphabet.a );
 	console.log( alphabet__default.length );

test/form/external-imports/_expected/umd.js

@@ -8,7 +8,7 @@
 	var alphabet__default = 'default' in alphabet ? alphabet['default'] : alphabet;
 
 	factory( null );
-	baz.foo( baz.bar );
+	baz.foo( baz.bar, containers.port );
 	containers.forEach( console.log, console );
 	console.log( alphabet.a );
 	console.log( alphabet__default.length );

test/form/external-imports/main.js

@@ -1,10 +1,11 @@
 import factory from 'factory';
 import { foo, bar } from 'baz';
 import * as containers from 'shipping-port';
+import { port } from 'shipping-port';
 import alphabet, { a, b } from 'alphabet';
 
 factory( null );
-foo( bar );
+foo( bar, port );
 containers.forEach( console.log, console );
 console.log( a );
 console.log( alphabet.length );