Open huruji opened 5 years ago
最近想要了解一下 webpack 的 plugin 怎么写，于是各种文章就会告诉你想要写一个 plugin 那么你首先需要了解一下 Compilation、compiler 对象，然后 plugin 插件其实是一个含有 apply 方法的 class，而 apply 方法的参数就是 compiler 对象，compiler 对象里有各种钩子，这些钩子分别会在 webpack 的运行过程中触发，而实现这些钩子的核心是 tapable ，这个 tapable 还算好理解，可以把它看做是一个更高级的 发布-订阅。然后我想实现以下 done 这个 hook 的功能，你就会发现这个 hook 的参数是 stats 对象，所以问题来了，我想要去实现 一个 plugin，那么是真的要搞清这些对象了。
我先弄了一个最简单的 webpack 配置：
const path = require('path') const myplugin = require('./myplugin') const config = { entry: path.join(__dirname, 'index.js'), output: { filename: 'main.js', path: path.resolve(__dirname, 'dist') }, module: { rules: [ { test: /\.js$/, use: 'babel-loader' } ] }, plugins: [ new myplugin() ], mode: "development" } module.exports = config
myplugin 是实现在 compiler 的 done hook中，内容如下：
const fs = require('fs') class HelloWord { apply(compiler) { compiler.hooks.done.tap('helloword', (stat) => { fs.writeFile('stat.json', JSON.stringify(stat, null, 2), {flag: 'w+'}); console.log('hello world') }) } } module.exports = HelloWord
然后控制台会告诉你 stats 对象内有循环引用，所以 JSON.stringify 会报错，那么使用 StackOVerflow 的方法解决：
JSON.stringify
const fs = require('fs') class HelloWord { apply(compiler) { compiler.hooks.done.tap('helloword', (stat) => { const cache = [] fs.writeFile('stats.json', JSON.stringify(stat, (key, value) => { if (cache.indexOf(value) !== -1) { return; } cache.push(value); })) console.log('hello world') }) } } module.exports = HelloWord
好的，这下可以正常输出了，我们打开我们的文件，文件内容如下：
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近 3000 行，真是让人望而却步呀
不过我们经过格式化后，可以发现这个时候的 stats 对象其实是一个 compilation 对象加上 编译开始和结束的时间戳：
我们继续发现，我们可以发现在 这个 compilation 里面包含了 compiler 对象，好的，那先看看 compiler 对象，如下：
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粗略看一下，可以发现 这里主要是 webpack 的配置，输入、输出、监听文件系统的描述，输出地址，compiler 对象的 hooks 等。
我们再看看 compilation 对象，这个对象主要有 assert 、 modules、 chunks、entries的信息。
最近想要了解一下 webpack 的 plugin 怎么写，于是各种文章就会告诉你想要写一个 plugin 那么你首先需要了解一下 Compilation、compiler 对象，然后 plugin 插件其实是一个含有 apply 方法的 class，而 apply 方法的参数就是 compiler 对象，compiler 对象里有各种钩子，这些钩子分别会在 webpack 的运行过程中触发，而实现这些钩子的核心是 tapable ，这个 tapable 还算好理解，可以把它看做是一个更高级的 发布-订阅。然后我想实现以下 done 这个 hook 的功能，你就会发现这个 hook 的参数是 stats 对象，所以问题来了，我想要去实现 一个 plugin，那么是真的要搞清这些对象了。
我先弄了一个最简单的 webpack 配置：
myplugin 是实现在 compiler 的 done hook中，内容如下：
然后控制台会告诉你 stats 对象内有循环引用，所以
JSON.stringify会报错，那么使用 StackOVerflow 的方法解决：好的，这下可以正常输出了，我们打开我们的文件，文件内容如下：
近 3000 行，真是让人望而却步呀
不过我们经过格式化后，可以发现这个时候的 stats 对象其实是一个 compilation 对象加上 编译开始和结束的时间戳：
我们继续发现，我们可以发现在 这个 compilation 里面包含了 compiler 对象，好的，那先看看 compiler 对象，如下：
粗略看一下，可以发现 这里主要是 webpack 的配置，输入、输出、监听文件系统的描述，输出地址，compiler 对象的 hooks 等。
我们再看看 compilation 对象，这个对象主要有 assert 、 modules、 chunks、entries的信息。