详解用Webpack与Babel配置ES6开发环境

# 本地安装
$ npm install --save-dev webpack webpack-cli

# 全局安装
$ npm install -g webpack webpack-cli

const path = require('path');

module.exports = {
 mode: 'none',
 entry: './src/index.js',
 output: {
  filename: 'bundle.js',
  path: path.resolve(__dirname, 'dist')
 }
}

export const isNull = val => val === null
export const unique = arr => [...new Set(arr)]

import { isNull, unique } from './a.js'
const arr = [1, 1, 2, 3]
console.log(unique(arr))
console.log(isNull(arr))

$ npm install --save-dev @babel/core @babel/preset-env babel-loader

{
 "presets": [
  "@babel/preset-env"
 ]
}

const path = require('path');

module.exports = {
 mode: 'none',
 entry: './src/index.js',
 output: {
  filename: 'bundle.js',
  path: path.resolve(__dirname, 'dist')
 },
 module: {
  rules: [
   {
    test: /\.js$/,
     loader: 'babel-loader',
     exclude: /node_modules/
   }
  ]
 }
}

$ npm install --save-dev @babel/polyfill @babel/plugin-transform-runtime

{
 "presets": [
  ["@babel/preset-env", {
   "useBuiltIns": "usage", // 在每个文件中使用polyfill时，为polyfill添加特定导入。利用捆绑器只加载一次相同的polyfill。
   "modules": false // 启用将ES6模块语法转换为其他模块类型，设置为false不会转换模块。
  }]
 ],
 "plugins": [
  ["@babel/plugin-transform-runtime", {
   "helpers": false
  }]
 ]
}

{
 "presets": [
  ["@babel/preset-env", {
   "useBuiltIns": "usage",
   "modules": false,
   "targets": {
    "browsers": "last 2 versions, not ie <= 9"
   }
  }]
 ],
 "plugins": [
  ["@babel/plugin-transform-runtime", {
   "helpers": false
  }]
 ]
}

// 23.2 Set Objects
module.exports = __webpack_require__(80)(SET, function (get) {
 return function Set() { return get(this, arguments.length > 0 "color: #ff0000">配置文件详情概览


package.json 文件：


{
 "name": "demo",
 "version": "1.0.0",
 "description": "",
 "main": "index.js",
 "scripts": {
  "test": "echo \"Error: no test specified\" && exit 1",
  "dev": "webpack"
 },
 "keywords": [],
 "author": "",
 "license": "ISC",
 "devDependencies": {
  "@babel/core": "^7.3.4",
  "@babel/plugin-transform-runtime": "^7.3.4",
  "@babel/polyfill": "^7.2.5",
  "@babel/preset-env": "^7.3.4",
  "babel-loader": "^8.0.5",
  "webpack": "^4.29.6",
  "webpack-cli": "^3.2.3"
 }
}


webpack.config.js 文件：


const path = require('path');

module.exports = {
 mode: 'none',
 entry: './src/index.js',
 output: {
  filename: 'bundle.js',
  path: path.resolve(__dirname, 'dist')
 },
 module: {
  rules: [
   {
    test: /\.js$/,
     loader: 'babel-loader',
     exclude: /node_modules/
   }
  ]
 }
}


.babelrc 文件：


{
 "presets": [
  ["@babel/preset-env", {
   "useBuiltIns": "usage",
   "modules": false,
   "targets": {
    "browsers": "last 2 versions, not ie <= 9"
   }
  }]
 ],
 "plugins": [
  ["@babel/plugin-transform-runtime", {
   "helpers": false
  }]
 ]
}


符录


usuallyjs 项目是本人最近建设的开源项目，欢迎感兴趣的同行交流。
usuallyjs: https://github.com/JofunLiang/usuallyjs
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。