背景

webpack构建过程中的hooks都有什么呢？除了在网上看一些文章，还可以通过更直接的办法，结合官方文档快速让你进入webpack的hook世界

写一个入口文件

//index.js
const webpack = require("webpack");
const path = require("path");
const PrintHooksPlugin = require("./PrintHooksPlugin");
const config = {
  context: path.resolve(__dirname),
  mode: "production",
  optimization: {
    minimize: false,
  },
  entry: "./main.js",
  target: ["web", "es5"],
  output: {
    filename: "bundle.js",
    path: path.resolve(__dirname, "dist"),
  },
  plugins: [new PrintHooksPlugin()],
};

const compiler = webpack(config);
compiler.run((err, stats) => {
  debugger;
});

//看下打印插件

//PrintHooksPlugin.js
class PrintHooksPlugin {
  constructor() {}
  //打印编译器Hooks
  printCompilerHooks(compiler) {
    //打印编译对象
    compiler.hooks.thisCompilation.tap("PrintHooksPlugin", (compilation) => {
      this.printCompilationHooks(compilation);
    });

    //遍历compiler hooks
    Object.keys(compiler.hooks).forEach((hookName) => {
      compiler.hooks[hookName].tap("PrintHooksPlugin", (arg) => {
        console.log(`${hookName}`, hookName, arg);
      });
    });
  }

  //打印编译（构建）Hooks
  printCompilationHooks(compilation) {
    let compilationHooks = compilation.hooks;

    //这里添加一个正则对象，判断Hook结尾的
    let reg = /Hook$/;
    Object.keys(compilationHooks).forEach((hookName) => {
      //获取hook函数名，判断以Hook结尾，并且不是log
      let name = compilationHooks[hookName].constructor.name;
      if (reg.test(name) && hookName !== "log") {
        compilationHooks[hookName].tap("PrintHooksPlugin", (arg) => {
          console.log(`compilation ${hookName}`, arg);
        });
      }
    });
  }

  //插件入口
  apply(compiler) {
    console.log(compiler);
    console.log(compiler.hooks.thisCompilation);
    this.printCompilerHooks(compiler);
  }
}
module.exports = PrintHooksPlugin;

//main.js
!(function () {
  console.log('hello world');
})();

结果

打印顺序就说明了生命周期的过程

截图不全，看一下后面的

总结

1. 换一种方法学习webpack的生命周期，那个hook在文档上看不太明白，直接断点，看看处理前后数据结构的变化。结合插件的源码。不信你不会
2. 我们主要掌握方法，除了书本的知识，还要结合实践