學習webpack4.x - ES6語法轉化
摘要：
...持續中
=======================================================
ES6語法轉化
注意：開始之前以下內容之前，需要配置一些webpack的基礎配置，傳送門： 學習webpack4.x - 基礎配置
當前目錄結構為：...
...持續中
=======================================================
ES6語法轉化
注意：開始之前以下內容之前，需要配置一些webpack的基礎配置，傳送門： 學習webpack4.x - 基礎配置
當前目錄結構為：
- index.js 檔案內容：
require('./index.css');
require('./index.scss');
- webpack.config.js檔案內容：
let path = require('path');
let HtmlWebpackPlugin = require('html-webpack-plugin');
let MiniCssExtractPlugin = require('mini-css-extract-plugin'); //抽離CSS
let OptimizeCssPlugin = require('optimize-css-assets-webpack-plugin'); //優化項，比如壓縮css等
let UglifyJsPlugin = require('uglifyjs-webpack-plugin'); //壓縮js
module.exports = {
// mode: 'development',
//優化項配置
optimization: {
minimizer: [
new OptimizeCssPlugin(),
new UglifyJsPlugin({
cache: true, //快取
parallel: true, //併發打包
sourceMap: true //原始碼對映便於除錯
})
]
},
//開一個本地服務
devServer: {
port: 3000, //埠號
progress: true, //進度條
contentBase: './dist', //指定目錄執行服務
open: true //自動開啟瀏覽器
},
entry: './src/index.js',
output: {
filename: 'bundle.js',
path: path.resolve(__dirname, 'dist')
},
// 模組配置
module: {
rules: [{
test: /\.(css|scss)$/,
use: [MiniCssExtractPlugin.loader, 'css-loader', 'postcss-loader', 'sass-loader']
}]
},
//外掛配置
plugins: [
new HtmlWebpackPlugin({
template: './src/index.html', //原始檔案
filename: 'index.html', //打包後的檔名稱
hash: true, //hash
}),
new MiniCssExtractPlugin({
filename: 'main.css' //抽離出的css檔名稱
})
]
}
- package.json檔案內容：
{
"name": "webpack",
"version": "1.0.0",
"main": "index.js",
"license": "MIT",
"scripts": {
"dev": "webpack --mode development && webpack-dev-server",
"build": "webpack --mode production"
},
"devDependencies": {
"autoprefixer": "^9.4.7",
"css-loader": "^2.1.0",
"html-webpack-plugin": "^3.2.0",
"less": "^3.9.0",
"less-loader": "^4.1.0",
"mini-css-extract-plugin": "^0.5.0",
"node-sass": "^4.11.0",
"optimize-css-assets-webpack-plugin": "^5.0.1",
"postcss-loader": "^3.0.0",
"sass-loader": "^7.1.0",
"style-loader": "^0.23.1",
"uglifyjs-webpack-plugin": "^2.1.1",
"webpack": "^4.29.4",
"webpack-cli": "^3.2.3",
"webpack-dev-server": "^3.1.14",
"webpack-html-plugin": "^0.1.1"
}
}
將ES6轉化為ES5
step1: 開啟src/index.js，輸入：
const fn = () => {
console.log('丸子');
}
fn ();
step2: 配置webpack.config.js檔案：
將ES6轉成ES5，需要babel-loader，配置規則為：
module.exports = {
//...
module: {
//...
{
test: /\.js$/,
use: {
loader: 'babel-loader',
options: {
presets: ['@babel/preset-env'] // 根據目標瀏覽器自動轉換為相應es5程式碼
}
}
}
}
};
step3: 安裝外掛：
yarn add babel-loader @babel/core @babel/preset-env -D
嘗試執行： npm run dev, 成功！如下圖：
