fix minification

webpack.config.js

@@ -20,13 +20,16 @@ const magicFile = (text) => {
 // const magicAppend = (orig, text, sep = '\n') => magicFile(fs.readFileSync(orig) + sep + text)
 
 const jsMin = {
-  pure_funcs: ['F2', 'F3', 'F4', 'F5', 'F6', 'F7', 'F8', 'F9', 'A2', 'A3', 'A4', 'A5', 'A6', 'A7', 'A8', 'A9'],
-  pure_getters: true,
-  keep_fargs: false,
-  unsafe_comps: true,
-  unsafe: true,
-  compress: true,
   mangle: true,
+  compress: {
+    keep_fargs: false,
+    pure_getters: true,
+    pure_funcs: ['F2', 'F3', 'F4', 'F5', 'F6', 'F7', 'F8', 'F9', 'A2', 'A3', 'A4', 'A5', 'A6', 'A7', 'A8', 'A9'],
+    unsafe: true,
+    ecma: 6,
+    unsafe_comps: true,
+    unsafe_arrows: true,
+  }
 }
 
 const htmlMin = {
@@ -107,10 +110,14 @@ module.exports = {
       }
     ],
   },
+  optimization: {
+    minimize: true,
+    minimizer: [
+      new TerserPlugin({ terserOptions: jsMin }),
+      new TerserPlugin({ terserOptions: jsMin }),
+    ],
+  },
   plugins: [
-    new TerserPlugin({
-      terserOptions: jsMin,
-    }),
     new CopyPlugin([{ from: 'data', to: 'data' }, { from: 'wand.js', to: 'wand.js' }]),
     new ImageminPlugin({
       jpegtran: { progressive: true },