Add options as second arg to .transformBundle

Currently only piping through `format`, could certainly pass others if
necessary. Maybe all should be brought through?

src/Bundle.js

@@ -347,7 +347,7 @@ export default class Bundle {
 		let map = null;
 		const bundleSourcemapChain = [];
 
-		code = transformBundle( code, this.plugins, bundleSourcemapChain )
+		code = transformBundle( code, this.plugins, bundleSourcemapChain, options )
 			.replace( new RegExp( `\\/\\/#\\s+${SOURCEMAPPING_URL}=.+\\n?`, 'g' ), '' );
 
 		if ( options.sourceMap ) {

src/utils/transformBundle.js

@@ -1,13 +1,13 @@
 import { decode } from 'sourcemap-codec';
 
-export default function transformBundle ( code, plugins, sourceMapChain ) {
+export default function transformBundle ( code, plugins, sourceMapChain, options ) {
 	return plugins.reduce( ( code, plugin ) => {
 		if ( !plugin.transformBundle ) return code;
 
 		let result;
 
 		try {
-			result = plugin.transformBundle( code );
+			result = plugin.transformBundle( code, { format : options.format } );
 		} catch ( err ) {
 			err.plugin = plugin.name;
 			err.message = `Error transforming bundle${plugin.name ? ` with '${plugin.name}' plugin` : ''}: ${err.message}`;

test/form/transform-bundle-plugin-options/_config.js

@@ -0,0 +1,12 @@
+module.exports = {
+	description: 'plugin .transformBundle gets passed options',
+	options: {
+		plugins: [
+			{
+				transformBundle: function (code, options) {
+					return JSON.stringify(options);
+				}
+			}
+		]
+	}
+};

test/form/transform-bundle-plugin-options/_expected/amd.js

@@ -0,0 +1 @@
+{"format":"amd"}

test/form/transform-bundle-plugin-options/_expected/cjs.js

@@ -0,0 +1 @@
+{"format":"cjs"}

test/form/transform-bundle-plugin-options/_expected/es.js

@@ -0,0 +1 @@
+{"format":"es"}

test/form/transform-bundle-plugin-options/_expected/iife.js

@@ -0,0 +1 @@
+{"format":"iife"}

test/form/transform-bundle-plugin-options/_expected/umd.js

@@ -0,0 +1 @@
+{"format":"umd"}

test/form/transform-bundle-plugin-options/main.js

@@ -0,0 +1 @@
+console.log( 1 + 1 );