Actual solution to UglifyJs error when packaging iview (detailed tutorial)-JS Tutorial-php.cn

Now I will share with you an article to solve the problem of UglifyJs error when packaging iview. It has a good reference value and I hope it will be helpful to everyone.

The operation is ok when using npm run dev, but iview reports an error when npm run build is packaged,

is as follows:

The reason is that iview uses es6 syntax, but uglifyJs does not support it. Open our build/webpack.prod.conf.js file and you can see

// UglifyJs do not support ES6+, you can also use babel-minify for better treeshaking: https://github.com/babel/minify new webpack.optimize.UglifyJsPlugin({ compress: { warnings: false }, sourceMap: config.build.productionSourceMap, parallel: true }),

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It has been prompted that uglifyJs does not support es6.

Solution:

In webpack.base.conf.js, we first compile in js When adding the following:

{ test: /\.js$/, loader: 'babel-loader', include: [resolve('src'), resolve('test'),resolve('/node_modules/iview/src'),resolve('/node_modules/iview/packages')] },

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First let iview's es6 syntax be converted by babel, then in build/webpack.prod.conf.js, comment out the original uglifyJs, and introduce external uglifyJs to compress js Obfuscated, the code is as follows:

// UglifyJs do not support ES6+, you can also use babel-minify for better treeshaking: https://github.com/babel/minify // new webpack.optimize.UglifyJsPlugin({ // compress: { // warnings: false // }, // sourceMap: config.build.productionSourceMap, // parallel: true // }), new UglifyJsPlugin({ // 使用外部引入的新版本的js压缩工具 parallel: true, uglifyOptions: { ie8: false, ecma: 6, warnings: false, mangle: true, // debug false output: { comments: false, beautify: false, // debug true }, compress: { // 在UglifyJs删除没有用到的代码时不输出警告 warnings: false, // 删除所有的 `console` 语句 // 还可以兼容ie浏览器 drop_console: true, // 内嵌定义了但是只用到一次的变量 collapse_vars: true, // 提取出出现多次但是没有定义成变量去引用的静态值 reduce_vars: true, } } }),

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Of course we need to introduce external plug-ins first:

const UglifyJsPlugin = require('uglifyjs-webpack-plugin');

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The above is what I compiled for everyone. I hope it will be helpful to everyone in the future.

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