webpack开发环境配置和生产环境配置

开发环境配置

在开发环境下,我们首先考虑的是方便开发,方便代码调试,不需要考虑代码合并和css样式分离这些。

这里主要说三个 :1.css模块化;2.模块热替换功能;3.source-map(代码映射)

// 开发环境打包配置

const path = require('path');
const webpack = require('webpack');
const base = require('./webpack.config.base')
const dfPath = require('./path')
// webpack配置合并工具
const merge =require('webpack-merge') const RS = (...arg)=>path.resolve( __dirname , ...arg ) // 合并方式配置
let strategyMerge = merge.strategy({
entry: 'prepend'
}); let config = {
entry: {
app: path.resolve(dfPath.root,'src/app.js')
}, output: {
path: dfPath.dist,
filename: '[name].bundle.js',
publicPath: '/',
chunkFilename: '[name].sepChunk.js'
},
module:{
rules: [
{
test: /\.js$/,
use:['babel-loader'],
exclude: [
dfPath.node_modules
]
},
{
test:/\.css$/,
use:[
'style-loader',
{
loader:'css-loader',
options:{
// css模块化,方便多人开发
module:true,
// 定义模块化css后的类名(默认为hash值,可读性差)path:路劲; name:文件名; local:本地定义的className
localIdentName: '[path][name]__[local]--[hash:base64:5]'
},
}
],
// 排除的文件,遇到这些文件不会用当前 loader 处理,也就不会模块化
exclude:[
RS('./src/common'),
RS('node_modules')
]
},
{
test:/\.css$/,
use:['style-loader','css-loader'],
include:[
RS('./src/common'),
RS('node_modules')
] }, {
test: /\.(png|jpg|jpeg|gif)$/,
use: ['url-loader?limit=8192'],
}
]
},
plugins:[
// 模块热替换功能
new webpack.HotModuleReplacementPlugin()
], // 代码映射,方便报错时,找到对应的源代码
devtool: 'cheap-module-eval-source-map', devServer:{
// 服务器打包后,输出的资源路劲
publicPath:'/',
open:true
}
}; // 导出合并后的webpack配置
module.exports = strategyMerge( base , config );

生产环境

相比开发环境,生产环境打包是要最后发布到服务器部署的代码,我们需要尽量保持代码简洁,加载性能最优,不需要调试辅助工具。

我们从这几个方面优化 :1.公共模块拆分,单独打包;2. css文件分离,单独打包输出;3.代码压缩;

// 生产环境配置
const webpack = require('webpack');
const base = require('./webpack.config.base')
const path = require('path');
const dfPath = require('./path');
const merge = require('webpack-merge'); // 压缩工具
const ClosureCompilerPlugin = require('webpack-closure-compiler');
// css单独打包插件
const extractTextWebpackPlugin = require('extract-text-webpack-plugin'); const extractCSS = new extractTextWebpackPlugin('assets/css/[name]_[contenthash:6].css'); // weback合并配置
let strategyMerge = merge.strategy({
entry: 'replace',
output: 'replace',
module:{
rules: 'replace'
}
}); let config ={ entry: {
// 公共模块拆分,这些代码会单独打包,一般我们会把引用的框架文件拆分出来,方便浏览器缓存,节省资源。
vender:['react'],
app: path.resolve(dfPath.root,'src/app.js')
}, output: {
path: dfPath.dist,
filename: 'assets/js/[name]_[chunkhash].bundle.js',
publicPath: '/',
chunkFilename: 'assets/js/[name].sepChunk.js',
hashDigestLength: 6
}, module:{
rules: [
{
test: /\.js$/,
use:['babel-loader'],
exclude: [
dfPath.node_modules
]
},
/* 开启 css单独打包 和 css模块化的配置 */
{
test: /\.css$/,
use: extractCSS.extract({
use: [
{
loader: 'css-loader',
options:{
modules: true
}
}
]
})
}, {
test: /\.(png|jpg|jpeg|gif)$/,
use: [
{
loader: 'url-loader',
options:{
limit:8192,
name: '[name]_[hash].[ext]',
outputPath: 'assets/img/'
}
}
],
}, {
test: /\.(mp4|ogg|svg|ico)$/,
use: [
{
loader: 'file-loader',
options:{
name: '[name]_[hash].[ext]',
outputPath: 'assets/media/'
}
}
]
},
{
test: /\.(woff|woff2)(\?v=\d+\.\d+\.\d+)?$/,
use: [ {
loader: 'url-loader',
options:{
limit:10000,
name: '[name]_[hash].[ext]',
outputPath: 'assets/font/',
mimetype: 'application/font-woff'
}
}
]
},
{
test: /\.ttf(\?v=\d+\.\d+\.\d+)?$/,
use: [
{
loader: 'url-loader',
options:{
limit:10000,
name: '[name]_[hash].[ext]',
outputPath: 'assets/font/',
mimetype: 'application/octet-stream'
}
}
]
},
{
test: /\.eot(\?v=\d+\.\d+\.\d+)?$/,
use: [
{
loader: 'file-loader',
options:{
name: '[name]_[hash].[ext]',
outputPath: 'assets/font/',
}
}
]
},
{
test: /\.svg(\?v=\d+\.\d+\.\d+)?$/,
use: [
{
loader: 'url-loader',
options:{
limit:10000,
name: '[name]_[hash].[ext]',
outputPath: 'assets/font/',
mimetype: 'image/svg+xml'
}
}
]
}, ]
}, plugins:[
extractCSS, // 设置 process.env(生产环境) 环境变量的快捷方式。
new webpack.EnvironmentPlugin({
NODE_ENV: 'production'
})
,new ClosureCompilerPlugin()
], devtool: 'source-map'
}; module.exports = strategyMerge(base,config);
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