webpack+react+antd腳手架優化
在以前的文章中瞭解了webpack v4的特性，如今將知識用於實踐，對以前寫的一個react腳手架進行打包性能的優化。css
優化類目
- 樣式分離
- 第三方資源分離
- 區分開發環境
- 熱更新
- 提取公共代碼
1. CSS分離
npm install extract-text-webpack-plugin -D
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webpack.config.jshtml
將css、less、sass文件單獨從打包文件中分離node
+ let cssExtract = new ExtractTextWebpackPlugin({
+ filename: 'css.css',
+ allChunks: true
+ });
+ let sassExtract = new ExtractTextWebpackPlugin('sass.css')
+ let lessExtract = new ExtractTextWebpackPlugin('less.css')
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在webpack.config.js中單獨添加規則，react
- test：匹配處理文件的擴展名的正則表達式
- include/exclude手動指定必須處理的文件夾或屏蔽不須要處理的文件夾
{
test: /\.css$/,
use: cssExtract.extract({
fallback: "style-loader",
use: ['css-loader?minimize','postcss-loader'],
publicPath: "/dist"
}),
include:path.join(__dirname,'./src'),
exclude:/node_modules/
},
{
test: /\.scss$/,
use: sassExtract.extract({
fallback: "style-loader",
use: ["css-loader?minimize","sass-loader"],
publicPath: "/dist"
}),
include:path.join(__dirname,'./src'),
exclude:/node_modules/
},
{
test: /\.less$/,
loader: lessExtract.extract({
use: ["css-loader?minimize", "less-loader"]
}),
include:path.join(__dirname,'./src'),
exclude:/node_modules/
},
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而後運行webpack命令時報錯jquery
compilation.mainTemplate.applyPluginsWaterfall is not a function
Use Chunks.groupsIterable and filter by instanceof Entrypoint instead
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研究得出結論：webpack升級到v4然而響應的插件沒有升級的原故。webpack
解決方法：安裝指定版本的依賴git
"html-webpack-plugin": "^3.0.4"
"extract-text-webpack-plugin": "^4.0.0-beta.0"
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resolve
指定extension以後能夠不用在require或是import的時候加文件擴展名,會依次嘗試添加擴展名進行匹配github
resolve: {
//引入模塊的時候，能夠不用擴展名
extensions: [".js", ".less", ".json"],
alias: {//別名
"bootstrap": "bootstrap/dist/css/bootstrap.css"
}
}
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配置別名後，在主js裏引入bootstrap能夠簡寫成web
import 'bootstrap';
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npm install bootstrap@4.0.0-beta -D
npm install jquery -D
npm install popper.js -D
webpack.config.js
plugins: [
...
new webpack.ProvidePlugin({
$: 'jquery',
jQuery: 'jquery',
'window.jQuery': 'jquery',
Popper: ['popper.js', 'default'],
...
})
]
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監聽文件修改
webpack模式下使用，webpack-dev-server模式不用，能夠將watch改成false正則表達式
watchOptions: {
ignored: /node_modules/,
aggregateTimeout: 300, //監聽到變化發生後等300ms再去執行動做，防止文件更新太快致使編譯頻率過高
poll: 1000 //經過不停的詢問文件是否改變來判斷文件是否發生變化，默認每秒詢問1000次
}
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提取公共代碼
optimization: {
splitChunks: {
cacheGroups: {
commons: {
chunks: "initial",
minChunks: 2,
maxInitialRequests: 5, // The default limit is too small to showcase the effect
minSize: 0 // This is example is too small to create commons chunks
},
vendor: {
test: /node_modules/,
chunks: "initial",
name: "vendor",
priority: 10,
enforce: true
}
}
}
}
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分離react react-dom ant公共代碼
- 方法一：externals
在頁面上引入第三方資源庫，而後使用externals防止將某些 import 的包(package)打包到 bundle 中，而是在運行時(runtime)再去從外部獲取這些擴展依賴(external dependencies)。
<script src="https://cdn.bootcss.com/react/16.4.0-alpha.0911da3/cjs/react.production.min.js"></script>
<script src="https://cdn.bootcss.com/react-dom/16.4.0-alpha.0911da3/cjs/react-dom-server.browser.production.min.js"></script>
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externals: { 'react': 'React', 'react-dom': 'ReactDOM', // 提出ant design的公共資源, }
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- 方法二：DLL
DLL在上篇文章中寫過，可是打包後一直出現
在index.html文件中引入
<script src="./vendor/react.dll.js"></script>
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分離成功！上代碼
webpack.base.js
var path = require('path');
var webpack = require('webpack');
var ExtractTextWebpackPlugin = require("extract-text-webpack-plugin");
const HtmlWebpackPlugin = require("html-webpack-plugin");
const CleanWebpackPlugin = require('clean-webpack-plugin');
const CopyWebpackPlugin = require('copy-webpack-plugin')
let cssExtract = new ExtractTextWebpackPlugin({
filename: 'css.css',
allChunks: true
});
let sassExtract = new ExtractTextWebpackPlugin('sass.css')
let lessExtract = new ExtractTextWebpackPlugin('less.css')
module.exports = {
entry:'./src/index.js',
output: {
path: path.resolve(__dirname, './dist'),
filename: 'bundle.[hash:8].js',
publicPath: ''
},
resolve: {
//引入模塊的時候，能夠不用擴展名
extensions: [".js", ".less", ".json"],
alias: {//別名
"bootstrap": "bootstrap/dist/css/bootstrap.css"
},
modules: [path.resolve(__dirname, 'node_modules')]
},
/* externals: {
'react': 'React',
'react-dom': 'ReactDOM',
// 提出ant design的公共資源
//'antd': 'antd',
},*/
devtool: 'source-map',
devServer: {
contentBase:path.resolve(__dirname,'dist'),
publicPath: '/',
port: 8080,
hot:true,
compress:true,
historyApiFallback: true,
inline: true
},
watch: false, //只有在開啓監聽模式時，watchOptions纔有意義
watchOptions: {
ignored: /node_modules/,
aggregateTimeout: 300, //監聽到變化發生後等300ms再去執行動做，防止文件更新太快致使編譯頻率過高
poll: 1000 //經過不停的詢問文件是否改變來判斷文件是否發生變化，默認每秒詢問1000次
},
optimization: {
splitChunks: {
cacheGroups: {
commons: {
chunks: "initial",
minChunks: 2,
maxInitialRequests: 5, // The default limit is too small to showcase the effect
minSize: 0 // This is example is too small to create commons chunks
},
vendor: {
test: /node_modules/,
chunks: "initial",
name: "vendor",
priority: 10,
enforce: true
}
}
}
},
module: {
rules:[
{
test: /\.js$/,
use: {
loader:'babel-loader',
options: {
presets: ['env','es2015', 'react'],
}
},
include:path.join(__dirname,'./src'),
exclude:/node_modules/
},
{
test: /\.css$/,
use: cssExtract.extract({
fallback: "style-loader",
use: ['css-loader?minimize','postcss-loader'],
publicPath: "/dist"
}),
include:path.join(__dirname,'./src'),
exclude:/node_modules/
},
{
test: /\.scss$/,
use: sassExtract.extract({
fallback: "style-loader",
use: ["css-loader?minimize","sass-loader"],
publicPath: "/dist"
}),
include:path.join(__dirname,'./src'),
exclude:/node_modules/
},
{
test: /\.less$/,
loader: lessExtract.extract({
use: ["css-loader?minimize", "less-loader"]
}),
include:path.join(__dirname,'./src'),
exclude:/node_modules/
},
{
test: /\.(html|htm)/,
use: 'html-withimg-loader'
},
{
test: /\.(png|jpg|gif|svg|bmp|eot|woff|woff2|ttf)/,
use: {
loader:'url-loader',
options:{
limit: 5 * 1024,
//指定拷貝文件的輸出目錄
outputPath: 'images/'
}
}
}
]
},
plugins: [
//定義環境變量
new webpack.DefinePlugin({
__development__: JSON.stringify(process.env.NODE_ENV)
}),
new CleanWebpackPlugin(['dist']),
cssExtract,
lessExtract,
sassExtract,
new HtmlWebpackPlugin({
title: 'React Biolerplate by YuanYuan',
template: './src/index.html',
filename: `index.html`,
hash: true
}),
new webpack.DllReferencePlugin({
manifest: path.join(__dirname, 'vendor', 'react.manifest.json')
}),
new CopyWebpackPlugin([{
from: path.join(__dirname,'vendor'),//靜態資源目錄源地址
to:'./vendor' //目標地址，相對於output的path目錄
}]),
/* new webpack.optimize.CommonsChunkPlugin({
name: 'common' // 指定公共 bundle 的名稱。
+ })*/
new webpack.HotModuleReplacementPlugin(), // 熱替換插件
new webpack.NamedModulesPlugin() // 執行熱替換時打印模塊名字
]
};
複製代碼
webpack.config.js
const path = require('path');
const webpack = require('webpack');
const merge = require('webpack-merge');//用來合併配置文件
const base = require('./webpack.base');
let other = '';
//console.log(process.env.NODE_ENV )
if (process.env.NODE_ENV == 'development') {
other = require('./webpack.dev.config');
} else {
other = require('./webpack.prod.config');
}
//console.log(merge(base, other));
module.exports = merge(base, other);
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webpack.prod.config.js
const path = require('path');
const webpack = require('webpack');
const UglifyJSPlugin = require('uglifyjs-webpack-plugin')
module.exports = {
output: {
filename: 'bundle.min.js',
},
plugins: [
new UglifyJSPlugin({sourceMap: true})
]
}
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打包速度優化，打包文件細化，改形成功~
以爲好玩就關注一下~歡迎你們收藏寫評論~~~
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