Exclude core-js from transpiling

debian/patches/0740-use-packaged-modules.patch

@@ -23,6 +23,15 @@
    },
  
    module: {
+@@ -171,7 +170,7 @@
+       },
+       {
+         test: /\.js$/,
+-        exclude: path => /node_modules|vendor[\\/]assets/.test(path) && !/\.vue\.js/.test(path),
++        exclude: [ path => /node_modules|vendor[\\/]assets/.test(path) && !/\.vue\.js/.test(path), /\bcore-js\b/,/\bwebpack\/buildin\b/ ],
+         loader: 'babel-loader',
+         options: {
+           cacheDirectory: path.join(CACHE_PATH, 'babel-loader'),
 @@ -433,19 +432,6 @@
      // enable HMR only in webpack-dev-server
      DEV_SERVER_LIVERELOAD && new webpack.HotModuleReplacementPlugin(),