正常运行的部分代码：

const UglifyJSPlugin = require('uglifyjs-webpack-plugin');
plugins: [
    new UglifyJSPlugin()
]

但是我一但给UglifyJSPlugin添加配置信息，运行就会报错，比如：

plugins: [
    new UglifyJSPlugin({
        warnings: false
    })
]

无论填什么都报错，不知道哪儿出问题了，求大神指点。
报错信息：

npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! webpack02@1.0.0 pack: `webpack`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the webpack02@1.0.0 pack script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     e:\tools\Roaming\npm-cache\_logs\2017-11-21T03_11_35_179Z-debug.log