How to extract third-party libraries using webpack-JS Tutorial-php.cn

How to extract third-party libraries using webpack

亚连

Release： 2018-06-19 09:30:16

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This article mainly introduces the correct posture of webpack to extract third-party libraries. There are two commonly used methods to extract third-party libraries. This article introduces these two methods in detail. Those who are interested can learn more

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

CommonsChunkPlugin
DLLPlugin

The difference : The first method requires the third-party library to be run and packaged once every time it is packaged. The second method only packages the project files each time. We only need to quote the third-party compressed file that was packaged for the first time.

CommonsChunkPlugin method introduction

Let’s take vue as an example

const vue = require(&#39;vue&#39;)
{
 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: &#39;app&#39;，
 // 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: [&#39;vue&#39;]
 },
 output: {
  path: __dirname + &#39;/bulid/&#39;,
 // 文件名称
 filename: &#39;[name].js&#39;
 },
 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(&#39;vendor&#39;, &#39;vendor.js&#39;)
 }
}

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Then package the generated file and introduce it into the html file

<script src="/build/vendor.js"></script>
 <script src="/build/bundle.js"></script>

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DLLPlugin method Introduction

First prepare two files

webpack.config.js
##webpack.dll.config. js

The webpack.dll.config.js file is configured as follows

const webpack = require(&#39;webpack&#39;)
const library = &#39;[name]_lib&#39;
const path = require(&#39;path&#39;)

module.exports = {
 entry: {
 vendors: [&#39;vue&#39;, &#39;vuex&#39;]
 },

 output: {
 filename: &#39;[name].dll.js&#39;,
 path: &#39;dist/&#39;,
 library
 },

 plugins: [
 new webpack.DllPlugin({
  path: path.join(__dirname, &#39;dist/[name]-manifest.json&#39;),
  // This must match the output.library option above
  name: library
 }),
 ],
}

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Then the webpack.config.js file is configured as follows

const webpack = require(&#39;webpack&#39;)

module.exports = {
 entry: {
 app: &#39;./src/index&#39;
 },
 output: {
 filename: &#39;app.bundle.js&#39;,
 path: &#39;dist/&#39;,
 },
 plugins: [
 new webpack.DllReferencePlugin({
  context: __dirname,
  manifest: require(&#39;./dist/vendors-manifest.json&#39;)
 })
 ]
}

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Then run

$ webpack --config webpack.dll.config.js
$ webpack --config webpack.config.js

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htmlQuotation method

<script src="/dist/vendors.dll.js"></script>
<script src="/dist/app.bundle.js"></script>

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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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