将es6添加到webpack需要3个步骤

在webpack.config.js中添加 模块:{ 规则:[ ｛ 测试:/ \ . js /美元, 装载机:“babel-loader” ｝ ］ ｝ 创建一个。babel。Rc，然后加进去

｛ "presets": ["@babel/env"， "@babel/react"]， “插件”:( ［ “@babel / plugin-proposal-class-properties”, ］ ］ }

在包中。json添加

NPM install @babel/core NPM install @babel/preset-env——save-dev NPM install @babel/preset-react——save-dev NPM install @babel/plugin-proposal-class-properties NPM安装babel-loader——save-dev

看了无数的文件之后……

只需安装es2015预置(不是env !!)并将其添加到 .babelrc: ｛ “预设”:( ["es2015"， {"modules": false}] ］ ｝ 将webpack.config.js重命名为webpack.config.babel.js

使用Webpack 4和Babel 7

要设置webpack配置文件以使用ES2015需要Babel:

安装开发依赖项:

npm i -D  webpack \
          webpack-cli \
          webpack-dev-server \
          @babel/core \
          @babel/register \
          @babel/preset-env
npm i -D  html-webpack-plugin

创建一个.babelrc文件:

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

创建webpack配置，webpack.config.babel.js:

import { resolve as _resolve } from 'path';
import HtmlWebpackPlugin from 'html-webpack-plugin';

const config = {
  mode: 'development',
  devServer: {
    contentBase: './dist'
  },
  plugins: [
    new HtmlWebpackPlugin({
      filename: 'index.html',
      template: 'src/index.html'
    })
  ],
  resolve: {
    modules: [_resolve(__dirname, './src'), 'node_modules']
  }
};

export default config;

在package.json中创建脚本:

  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "build": "webpack",
    "start": "webpack-dev-server --open"
  },

运行npm Run build和npm start。

webpack配置基于以下目录结构的示例项目:

├── README.md
├── package-lock.json
├── package.json
├── src
│   ├── Greeter.js
│   ├── index.html
│   └── index.js
└── webpack.config.babel.js

示例项目:Webpack配置语言使用Babel

我在Webpack 2上运行@Juho的解决方案时遇到了一个问题。Webpack迁移文档建议你打开babel模块解析:

重要的是要注意，您将希望告诉Babel不要解析 这些模块符号，以便webpack可以使用它们。你可以通过 在.babelrc或babel加载器选项中设置以下内容。 .babelrc:

{
    "presets": [
         ["es2015", { "modules": false }]
    ]
}

遗憾的是，这与自动巴别寄存器功能相冲突。删除

{ "modules": false }

巴别塔的配置让一切重新运转起来。然而，这将导致破坏摇树，所以一个完整的解决方案将涉及覆盖加载器选项中的预设:

module: {
    rules: [
        {
            test: /\.js$/,
            include: path.resolve('src'),
            loader: 'babel-loader',
            options: {
                babelrc: false,
                presets: [['env', {modules: false}]]
            }
        }
    ]
}

编辑，2017年11月13日;更新webpack配置片段到webpack 3(感谢@x-yuri)。旧的Webpack 2代码片段:

{
    test: /\.js$/,
    exclude: ['node_modules'],
    loader: 'babel',
    query: {
        babelrc: false,
        presets: [
            ['es2015', { modules: false }],
        ],
    },
},

Babel 7和Webpack 4的配置

package.json

    ...
    "scripts": {
        "start": "webpack-dev-server --env.dev",
        "build": "webpack --env.prod",
    },
    "keywords": [],
    "author": "",
    "license": "ISC",
    "devDependencies": {
        "@babel/core": "^7.0.0",
        "@babel/plugin-proposal-class-properties": "^7.0.0",
        "@babel/preset-env": "^7.0.0",
        "@babel/preset-react": "^7.0.0",
        "@babel/register": "^7.0.0",
        "babel-loader": "^8.0.0",
        ...
        "webpack": "^4.17.2",
        "webpack-cli": "^3.1.0",
        "webpack-config-utils": "^2.3.1",
        "webpack-dev-server": "^3.1.8"

.babelrc

{
    "presets": ["@babel/preset-env", "@babel/preset-react"],
    "plugins": ["@babel/plugin-proposal-class-properties"]
}

webpack.config.babel.js

import webpack from 'webpack';
import { resolve } from 'path';

import { getIfUtils, removeEmpty } from 'webpack-config-utils';

export default env => {
    const { ifProd, ifNotProd } = getIfUtils(env);

    return {
        mode: ifProd('production', 'development'),
        devtool: ifNotProd('cheap-module-source-map'),
        output: {
            path: resolve(__dirname, ifProd('prod', 'dev')),
            filename: 'bundle.js'
        },

另一种方法是这样写一个npm脚本:"webpack": "babel-node ./node_modules/webpack/bin/webpack"，然后像这样运行: