webpack+babel+react 搭建react環境

1.安裝

#安裝webpack
npm install --save-dev webpack
#如果使用webpack4+還要安裝cli
npm install --save-dev webpack-cli
#安裝輸出設置插件
npm install --save-dev html-webpack-plugin
#安裝webpack-dev-server
npm install --save-dev webpack-dev-server

#babel 核心包
npm install --save-dev babel-core

#babel 語法轉換的包
npm install --save-dev babel-preset-env
npm install --save-dev babel-preset-stage-0

#babel API轉換的包
npm install --save-dev babel-plugin-transform-runtime
npm install --save babel-runtime

#結合webpack使用需要安裝的包,爲什麼安裝7版本見版本匹配目錄
npm install --save-dev babel-loader@7

#安裝react和react-dom
npm install --save react react-dom

#解析react語法的預設
npm install --save-dev babel-preset-react

2.配置webpack.config.js

const HtmlWebpackPlugin = require('html-webpack-plugin');
//webpack 4.x中，如果不寫entry,他默認打包src下index.js
//若不寫output，默認打包到dist目錄下，生成main.js文件
module.exports = {
    mode:"development",
    devServer: {
        //配置webpack-dev-server的www目錄
        contentBase: './'
    },
    //-----------------輸出設置 start------------------
    plugins: [
        // 該插件就是將index.html打包到你bundle.js所屬的目錄,同時會自動在index.html中注入script標籤，所以在src/index.html文件中不用自己引入bundle.js
        new HtmlWebpackPlugin({
            template: './src/index.html'
        })
    ],
    module:{
        rules:[
            {
                test: /\.jsx?$/,
                exclude: /node_modules/,//排除node_modules目錄中的文件
                use: 'babel-loader'
            }
        ]
    }
}

3.配置.babelrc

{
	"presets":["env","stage-0","react"],
	"plugins":["transform-runtime"]
}

4.配置package.json

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

4.啓動

npm run dev