【webpack】----webpack基本配置

const path = require("path");
const HtmlWebpackPlugin = require("html-webpack-plugin");
//配置路径
const PATH = {
    //path.jion 把当前文件的绝对路径与相对路径相结合生成新的路径
    app:path.join(__dirname,"src/index.js"),
    build:path.join(__dirname,"dist")
}

//module 打包的配置项
module.exports = {
    entry:{
        app:PATH.app
    },
    output:{
        filename:"[name].js",
        path:PATH.build
    },
   module:{
    //test  匹配类型 通过loader进行合并
       rules:[
           {
                test:/.(js|jsx)$/,
                use:{
                 //打包js  一个打包的工具
                    loader:"babel-loader",
                    options:{
                        presets:["@babel/env","@babel/react"]
                    }
                },
               exclude:__dirname+"node_modules"
           },{
               test:/.(css|scss)$/,
               loader:["style-loader","css-loader","sass-loader"]
           }
       ]
   },
//plugins  插件
   plugins:[
        new HtmlWebpackPlugin({
            template:"index.html",
            filename:"index.html"
        })
   ]

}