webpack tree-shaking
未从模块中import导入的方法,未引用代码应该从export中删除
4.36.1
![](https://img.haomeiwen.com/i9540784/d07e26e2f6cb65e2.png)
而实际中的打包后的文件
4.35.3->4.36.1
![](https://img.haomeiwen.com/i9540784/ef977a983415ef04.png)
设置mode:production默认启用uglifyPlugin压缩main.js
ERROR in main300a26b3c01958e963f8.js from UglifyJs
Unexpected token: name «dom», expected: punc «;» [./src/index.js:6,0][main300a26b3c01958e963f8.js:117,8]
![](https://img.haomeiwen.com/i9540784/6f89174aa7c3a510.png)
uglifyjs 不支持ES6 (ES2015), 所以你需要在webpack uglify 之前, 把报错的文件(或文件夹)用babel-loader 处理
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