fix browserlist and add vendor.js chunk

webmaker/package.json

@@ -60,5 +60,9 @@
 			"^create-react-class$": "preact-compat/lib/create-react-class",
 			"^react-addons-css-transition-group$": "preact-css-transition-group"
 		}
-  }
+	},
+	"browserslist": [
+		"last 3 Chrome versions",
+		"last 3 Firefox versions"
+	]
 }

webmaker/preact.config.js

@@ -1,4 +1,5 @@
 import CopyWebpackPlugin from 'copy-webpack-plugin'
+var CommonsChunkPlugin = require('webpack/lib/optimize/CommonsChunkPlugin');
 
 /**
  * Function that mutates original webpack config.
@@ -12,6 +13,15 @@ export default function (config, env, helpers) {
 	if (env.isProd) {
 		config.devtool = false; // disable sourcemaps
 
+		config.plugins.push(
+			new CommonsChunkPlugin({
+				name: 'vendor',
+				minChunks: ({
+					resource
+				}) => /node_modules/.test(resource),
+			})
+		);
+
 		config.plugins.push(new CopyWebpackPlugin([{
 				context: `${__dirname}/src/assets`,
 				from: `*.*`