Add -npm option for HTML5

templates/html5/npm/webpack.prod.js

@@ -0,0 +1,17 @@
+const webpack = require ('webpack');
+const merge = require ('webpack-merge');
+const UglifyJSPlugin = require ('uglifyjs-webpack-plugin');
+const common = require ('./webpack.common.js');
+
+module.exports = merge (common, {
+	mode: 'production',
+	devtool: "source-map",
+	plugins: [
+		new UglifyJSPlugin ({
+			sourceMap: true
+		}),
+		new webpack.DefinePlugin ({
+			'process.env.NODE_ENV': JSON.stringify ('production')
+		})
+	]
+});