When we use webpack to package, we often want to extract the third-party library separately, use it as a stable version file, and use the browsing cache to reduce the number of requests. There are two commonly used methods to extract third-party libraries. This article mainly introduces the correct posture of extracting third-party libraries with webpack. There are two commonly used methods to extract third-party libraries. This article introduces these two methods in detail. For those who are interested You can learn about it, I hope it can help everyone.
CommonsChunkPlugin
DLLPlugin
Difference: The first type must be packaged every time The third-party library also runs packaging once. The second method only packages the project file each time. We only need to quote the third-party compressed file packaged for the first time.
CommonsChunkPlugin method introduction
Let’s take vue as an example
const vue = require('vue') { entry: { // bundle是我们要打包的项目文件的导出名字, app是入口js文件 bundle: 'app', // vendor就是我们要打包的第三方库最终生成的文件名,数组里是要打包哪些第三方库, 如果不是在node——modules里面,可以填写库的具体地址 vendor: ['vue'] }, output: { path: __dirname + '/bulid/', // 文件名称 filename: '[name].js' }, plugins: { // 这里实例化webpack.optimize.CommonsChunkPlugin构造函数 // 打包之后就生成vendor.js文件 new webpack.optimize.CommonsChunkPlugin('vendor', 'vendor.js') } }
Then package the generated file and introduce it into the html file
<script src="/build/vendor.js"></script> <script src="/build/bundle.js"></script>
Introduction to DLLPlugin method
First prepare two files
webpack.config.js
webpack.dll.config.js
The webpack.dll.config.js file is configured as follows
##
const webpack = require('webpack') const library = '[name]_lib' const path = require('path') module.exports = { entry: { vendors: ['vue', 'vuex'] }, output: { filename: '[name].dll.js', path: 'dist/', library }, plugins: [ new webpack.DllPlugin({ path: path.join(__dirname, 'dist/[name]-manifest.json'), // This must match the output.library option above name: library }), ], }
const webpack = require('webpack') module.exports = { entry: { app: './src/index' }, output: { filename: 'app.bundle.js', path: 'dist/', }, plugins: [ new webpack.DllReferencePlugin({ context: __dirname, manifest: require('./dist/vendors-manifest.json') }) ] }
$ webpack --config webpack.dll.config.js $ webpack --config webpack.config.js
<script src="/dist/vendors.dll.js"></script> <script src="/dist/app.bundle.js"></script>
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