const { resolve } = require('path');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');
const OptimizeCssAssetsWebpackPlugin = require('optimize-css-assets-webpack-plugin');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const WorkboxWebpackPlugin = require('workbox-webpack-plugin')
/*
PWA：渐进式网络开发应用程序(离线可访问)
workbox --> workbox-webpack-plugin
*/
// 定义nodejs环境变量：决定使用browserslist的哪个环境
process.env.NODE_ENV = 'production';
// 复用loader
const commonCssLoader = [
MiniCssExtractPlugin.loader,
'css-loader',
{
// 还需要在package.json中定义browserslist
loader: 'postcss-loader',
options: {
ident: 'postcss',
plugins: () => [require('postcss-preset-env')()]
}
}
];
module.exports = {
entry: './src/js/index.js',
output: {
filename: 'js/built.[contenthash:10].js',
path: resolve(__dirname, 'build')
},
module: {
rules: [
{
// 在package.json中eslintConfig --> airbnb
test: /\.js$/,
exclude: /node_modules/,
// 优先执行
enforce: 'pre',
loader: 'eslint-loader',
options: {
fix: true
}
},
{
// 以下loader只会匹配一个
// 注意：不能有两个配置处理同一种类型文件
oneOf: [
{
test: /\.css$/,
use: [...commonCssLoader]
},
{
test: /\.less$/,
use: [...commonCssLoader, 'less-loader']
},
/*
正常来讲，一个文件只能被一个loader处理。
当一个文件要被多个loader处理，那么一定要指定loader执行的先后顺序：
先执行eslint 在执行babel
*/
{
test: /\.js$/,
exclude: /node_modules/,
loader: 'babel-loader',
options: {
presets: [
[
'@babel/preset-env',
{
useBuiltIns: 'usage',
corejs: { version: 3 },
targets: {
chrome: '60',
firefox: '50'
}
}
]
],
// 开启babel缓存
// 第二次构建时，会读取之前的缓存
cacheDirectory: true
}
},
{
test: /\.(jpg|png|gif)/,
loader: 'url-loader',
options: {
limit: 8 * 1024,
name: '[hash:10].[ext]',
outputPath: 'imgs',
esModule: false
}
},
{
test: /\.html$/,
loader: 'html-loader'
},
{
exclude: /\.(js|css|less|html|jpg|png|gif)/,
loader: 'file-loader',
options: {
outputPath: 'media'
}
}
]
}
]
},
plugins: [
new MiniCssExtractPlugin({
filename: 'css/built.[contenthash:10].css'
}),
new OptimizeCssAssetsWebpackPlugin(),
new HtmlWebpackPlugin({
template: './src/index.html',
minify: {
collapseWhitespace: true,
removeComments: true
}
}),
new WorkboxWebpackPlugin.GenerateSW({
/**
* 1. 帮助serviceworker快速启动
* 2. 删除旧的 serviceworker
*
* 生成一个 serviceworker 配置文件
*/
clientsClaim: true,
skipWaiting: true
})
],
mode: 'production',
devtool: 'source-map'
};
入口文件
/**
* 1. eslint不认识 window、navigator全局变量
* 解决：需要修改package.json中的eslintConfig配置
* "env": {
* "browser":true // 支持浏览器端全局变量
* }
*
* 2. sw代码必须运行在服务器上
* --> nodejs
* -->
* npm i serve -g
* serve -s build 启动服务器，将build目录下所有资源作为静态资源暴露出去
*/
// 注册serviceworker
// 处理兼容性问题
if ('serviceWorker' in navigator) {
window.addEventListener('load', () => {
navigator.serviceWorker.register('/service-worker.js')
.then(() => {
console.log('sw注册成功了~');
})
.catch(() => {
console.log('sw注册失败了~');
});
});
}
