Added webpack to compile JS scripts. (#45)

index.js

@@ -8,15 +8,20 @@ module.exports = function (gulp) {
     maintainScope: false,
     overridePattern: false,
     pattern: [
+      '@netzstrategen/twig-asset',
       'del',
       'minimist',
-      'path',
       'node-sass-magic-importer',
-      '@netzstrategen/twig-asset'
+      'path',
+      'vinyl-named',
+      'webpack',
+      'webpack-stream',
     ],
     rename: {
+      '@netzstrategen/twig-asset': 'twigAsset',
       'node-sass-magic-importer': 'magicImporter',
-      '@netzstrategen/twig-asset': 'twigAsset'
+      'vinyl-named': 'named',
+      'webpack-stream': 'webpackStream',
     }
   });
 

lib/webpack.config.js

@@ -0,0 +1,45 @@
+const terserWebpack = require('terser-webpack-plugin');
+
+module.exports = {
+  mode: process.env.NODE_ENV || 'production',
+  cache: true,
+  devtool: process.env.NODE_ENV === 'development' ? 'eval' : false,
+  stats: {
+    entrypoints: false,
+    children: false
+  },
+  optimization: {
+    minimizer: [
+      new terserWebpack({
+        parallel: true,
+        terserOptions: {
+          ecma: 8,
+          compress: { warnings: false },
+          keep_classnames: true,
+          keep_fnames: true,
+          output: {
+            comments: false,
+            beautify: false
+          }
+        }
+      })
+    ]
+  },
+  plugins: [],
+  module: {
+    rules: [
+      {
+        test: /\.js$/,
+        exclude: /node_modules/,
+        use: [
+          {
+            loader: 'babel-loader',
+            options: {
+              presets: ['@babel/preset-env'],
+            }
+          }
+        ]
+      }
+    ]
+  }
+};