UglifyJs Unexpected token: punc (,)

vue打包报错：

查到几种可能原因，一一排除

@click 调用方法传参多了个逗号
仔细检查了，确认没有写多逗号
uglifyjs-webpack-plugin代替webpack.optimize.UglifyJsPlugin

yarn uglifyjs-webpack-plugin --save-dev

  new webpack.optimize.UglifyJsPlugin({compress: {warnings: false},sourceMap: config.build.productionSourceMap,parallel: true}),

替换成：

const UglifyJsPlugin = require("uglifyjs-webpack-plugin");
...new UglifyJsPlugin({"uglifyOptions":{compress: {warnings: false,drop_debugger: true, drop_console: true }},sourceMap: config.build.productionSourceMap,parallel: true}),

重新build还是报错

依赖包使用了es6，但是未经过babel-loader解析
用sourceMap：”source-map“模式看一下具体报错的文件：

{test: /\.mjs$/,loader: 'babel-loader',include: [resolve('node_modules/@vant/popperjs/dist/index.esm.mjs')]},{test: /\.js$/,loader: 'babel-loader',include: [resolve('src'), resolve('test'), resolve('node_modules/js/static'), resolve('node_modules/mint-ui/node_modules/vue-lazyload')]},

这时候再重新build发现竟然可以了！
再把第二步的修改还原看一下，build也没有报错。
所以可以确定问题出在依赖包中使用了es6，将相关包用babel-loader解析一下即可。

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