const webpack = require('webpack')
module.exports ={
entry: __dirname +'/app/index.js',//__dirname node.js全局变量 脚本所在目录
output: {
filename: 'bundle.js',
path: __dirname + "/public"
},
devtool: 'eval-source-map',//方便调试 cheap-module-eval-source-map大型项目中打包速度快不方便调试
devServer: {//安装npm install -g webpack-dev-server 搭建本地服务器
contentBase: './public',//服务器加载页面得目录
historyApiFallback: true,//不跳转
hot:true,
inline: true//实时刷新
},
module: {
rules: [
{
test:/(.jsx|.js)$/,//正则表达式删选文件
use:{
loader:'babel-loader',//loader
options:{
presets:[//预处理loader
"env","react"
]
}
},
exclude: /node_modules/ //排除不需要处理文件
},{
test:/(.css | .less)$/,
use: [
{
loader: "style-loader"
},{
loader: 'css-loader'
}
]

        }
    ]
},
plugins: [
    new webpack.HotModuleReplacementPlugin()
]

};