webpack开发和生产环境配置

• 首先完成webpack基础配置
• 创建webpack.dev.config.js和webpack.prod.js文件后配置package.json如下：
  
• 安装依赖包：html-webpack-plugin、css-loader、style-loader、less-loader、file-loader(图片相关)、CleanWebpackPlugin(清理上一次的记录)、MiniCssExtractPlugin(抽离css文件)

我的src文件夹内容如下：
index.html

index.css

index.less

index.js

接下来配置webpack.dev.config.js

const path=require('path');
const HtmlWebpackPlugin=require('html-webpack-plugin');
const {
    
    CleanWebpackPlugin}=require('clean-webpack-plugin');//清理上次记录
const MiniCssExtractPlugin=require('mini-css-extract-plugin');//抽离css

const dev_dir='dev_folder';
module.exports={
    
    
    mode:'development',
    entry:{
    
    
        index:'./src/index.js'
    },
    module:{
    
    
        rules:[
            {
    
    
                test:/\.css$/,
                use:[MiniCssExtractPlugin.loader,'css-loader']
            },
            {
    
    
                test:/\.less$/,
                use:[MiniCssExtractPlugin.loader,'css-loader','less-loader']
            },
            {
    
    
                test:/\.(jpg|png|svg)$/,
                use:'file-loader'
            }
        ]  
    },
    output:{
    
    
        filename:'[name]_dev.js',
        path:path.resolve(__dirname,dev_dir)
    },
    plugins:[
        new MiniCssExtractPlugin(),
        new CleanWebpackPlugin(),
        new HtmlWebpackPlugin({
    
    
            template:'./src/index.html'
        })
    ]
}

• 新建一个common.config.js文件，写webpack.dev.config.js和webpack.prod.config.js的公共部分，也就是：

const HtmlWebpackPlugin=require('html-webpack-plugin');
const MiniCssExtractPlugin=require('mini-css-extract-plugin');

module.exports={
    
    
    entry:{
    
    
        index:'./src/index.js'
    },
    module:{
    
    
        rules:[
            {
    
    
                test:/\.css$/,
                use:[MiniCssExtractPlugin.loader,'css-loader']
            },
            {
    
    
                test:/\.less$/,
                use:[MiniCssExtractPlugin.loader,'css-loader','less-loader']
            },
            {
    
    
                test:/\.(jpg|png|svg)$/,
                use:'file-loader'
            }
        ]  
    },
    plugins:[
        new MiniCssExtractPlugin(),
        new HtmlWebpackPlugin({
    
    
            template:'./src/index.html'
        })
    ]
}

• 删掉webpack.dev.config.js中公共部分内容后，用webpackMerge合并commom.config.js和webapck.dev.config.js的配置（先要安装webpack-merge）

const path=require('path');
const {
    
    CleanWebpackPlugin}=require('clean-webpack-plugin');
const {
    
    merge}=require('webpack-merge');
const commonconfig=require('./common.config');

const dev_dir='dev_folder';
module.exports=merge(commonconfig,{
    
    
    mode:'development',
    output:{
    
    
        filename:'[name]_dev.js',
        path:path.resolve(__dirname,dev_dir)
    },
    plugins:[
        
        new CleanWebpackPlugin(),
    ]
})

• 将webapck.dev.config.js中内容copy到webpack,prod.config.js，稍作修改后如下：

const path=require('path');
const {
    
    CleanWebpackPlugin}=require('clean-webpack-plugin');
const {
    
    merge}=require('webpack-merge');
const commonconfig=require('./common.config');

const dev_dir='prod_folder';
module.exports=merge(commonconfig,{
    
    
    mode:'production',
    output:{
    
    
        filename:'[name]_prod.js',
        path:path.resolve(__dirname,dev_dir)
    },
    plugins:[
        
        new CleanWebpackPlugin(),
    ]
})

执行yarn dev和yarn prod：

index.html

总结：配置dev—>抽取common—>合并(webpackMerge)—>copy到prod稍作修改。