Webpack4 的 Tree Shaking:babel-loader设置modules: false,还是设置"sideEffects": false,待确定 Webpack4 的 Tree Shaking:babel-loader设置modules: false,还是设置"sideEffects": false,待确定 babel-loader设置modules: false,https://www.cnblogs.com/cag2050/p/10086940.html 设置"sideEffects": false,https://ericteen.github.io/2018/03/12/optimization/