webpack打包原理

##webpack的基础配置
const path = require("path")

module.exports = {
    mode:"development",
    entry:"./src/index.js",
    output:{
        path:path.resolve(__dirname,"./dist"),
        filename:"main.js"
    }
}

##webpack.js
const fs = require("fs");

module.exports = class webpack {
    constructor(options){
        let {entry,output} = options
        //入口信息
        this.entry = entry;
        //出口信息
        this.output = output;
    }
    run(){
        //开始分析入口模块内容
        this.parse(this.entry)
    }
    parse(entryFile){
        //拿到文件内容
        const content = fs.readFileSync(entryFile,"utf-8");
        //分析-哪些是源码-哪些是依赖,我们借助babel插件：安装：npm i @babel/parser --save
        console.log(content)
    }
}

##bundle.js
//打包入口
const options = require("./webpack.config.js")
const webpack = require("./lib/webpack.js")
new webpack(options)