'use strict' const webpack = require('webpack') const paths = require('./paths') const CopyWebpackPlugin = require('copy-webpack-plugin') const HtmlWebpackPlugin = require('html-webpack-plugin') const ManifestPlugin = require('webpack-manifest-plugin') const ExtractTextPlugin = require('extract-text-webpack-plugin') const CaseSensitivePathsPlugin = require('case-sensitive-paths-webpack-plugin') const OptimizeCSSPlugin = require('optimize-css-assets-webpack-plugin') module.exports = { entry: paths.appEntry, output: { pathinfo: true, path: paths.appBuild, filename: '[name].[hash].js' }, bail: true, devtool: 'source-map', resolve: { extensions: [ '.js', '.vue', '.scss', '.css', '.json' ], alias: { 'src': paths.appSrc } }, module: { rules: [ { test: /\.vue$/, loader: 'vue-loader', options: { extract: true, loaders: ExtractTextPlugin.extract({ use: [ { loader: 'css-loader', options: { minimize: true, sourcMap: true } }, { loader: 'sass-loader', options: { indentedSyntax: true, sourcMap: true } } ], fallback: 'vue-style-loader' }) } }, { test: /\.js$/, loader: 'babel-loader', exclude: /node_modules/ }, { test: /\.(png|jpg|gif|svg)$/, loader: 'file-loader', options: { name: '[name].[ext]?[hash]' } } ] }, plugins: [ new webpack.HotModuleReplacementPlugin(), new CaseSensitivePathsPlugin(), new webpack.DefinePlugin({ PRODUCTION: JSON.stringify(process.env.NODE_ENV === 'prod') }), new HtmlWebpackPlugin({ inject: true, template: paths.appHtml, minify: { removeComments: true, collapseWhitespace: true, removeRedundantAttributes: true, useShortDoctype: true, removeEmptyAttributes: true, removeStyleLinkTypeAttributes: true, keepClosingSlash: true, minifyJS: true, minifyCSS: true, minifyURLs: true } }), new webpack.optimize.UglifyJsPlugin({ compress: { warnings: false, comparisons: false }, output: { comments: false }, sourceMap: true }), new OptimizeCSSPlugin({ cssProcessorOptions: { safe: true } }), new ExtractTextPlugin({filename: '[name].[contenthash:8].css'}), new ManifestPlugin({fileName: 'asset-manifest.json'}), new CopyWebpackPlugin([ { from: paths.appPublic, to: paths.appBuild, ignore: ['.*'] } ]) ] }

Der Grund für den Fehler scheint zu sein, dass das uglifyjs-Plug-in die es6-Syntax nicht erkennt

Außerdem ist mein CSS nicht unabhängig in eine CSS-Datei gepackt und immer noch mit JS gemischt. . .
Vielen Dank für Ihre Hilfe.