webpack 用 webpack-parallel-uglify-plugin 加速打包报错

用 UglifyJsPlugin 可以正常打包，就是很慢

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

用 ParallelUglifyPlugin 加速打包之后

new ParallelUglifyPlugin({ cacheDir: '.cache/', uglifyJS: { output: { comments: false }, compress: { warnings: false } }, sourceMap: config.build.productionSourceMap }),

打包失败，报错

ERROR in Encountered an error while minifying static/js/0.feb0ac937597219abdc1.js: `warnings` is not a supported option

将： compress: { warnings: false } 改为： warnings: false

new ParallelUglifyPlugin({ cacheDir: '.cache/', uglifyJS:{ output: { comments: false }, warnings: false, compress: { drop_debugger: true, drop_console: true } } }),