webpack 4 快速搭建

安装

npm install --save-dev webpack@4.30.0 webpack-cli@3.3.2

更新 package.json 脚本

"scripts": {
    "build": "webpack --config webpack.config.js"
}

更新目录结构

  webpack-demo
  |- package.json
+ |- webpack.config.js
+ |- index.html
+ |- /src
+   |- index.js

更新 webpack.config.js

const path = require('path');

module.exports = {
  entry: './src/index.js',
  output: {
    filename: 'bundle.js',
    path: path.resolve(__dirname, 'dist')
  }
};

设定 HtmlWebpackPlugin

npm install --save-dev html-webpack-plugin@3.2.0

# webpack.config.js
const HtmlWebpackPlugin = require('html-webpack-plugin');
// ...
plugins: [
  new HtmlWebpackPlugin({
    filename: path.resolve(__dirname, 'dist/index.html'),
    template: path.resolve(__dirname, 'index.html'),
    inject: true,
    chunksSortMode: 'dependency'
  })
]

清理 /dist 文件夹

npm install clean-webpack-plugin@1.0.1 --save-dev

# webpack.config.js
const CleanWebpackPlugin = require('clean-webpack-plugin');
// ...
plugins: [
  new CleanWebpackPlugin(['dist'])
],

使用观察模式

"watch": "webpack --watch"

运行 npm run watch 可以实时编译文件。

配置 babel

npm install -D babel-loader@7.1.4
npm install -D babel-core@6.26.0
npm install -D babel-preset-env@1.6.1

# 
npm install -D babel-loader@7.1.4 babel-core@6.26.0 babel-preset-env@1.6.1

新建 .babelrc 文件

{
  "presets": ["env"]
}

修改 webpack.config.js

module.exports={
    module: {
        rules: [
            {
                test: /\.js$/,
                 exclude: /node_modules/, 
                 loader: "babel-loader"
            }
        ]
    }
}

配置 sass

npm install -D node-sass@4.11.0 sass-loader@7.1.0 css-loader@2.1.0 style-loader@0.23.1

# webpack.config.js
module: {
    rules: [
        {
            test: /\.scss$/,
            use: ['style-loader', 'css-loader', 'sass-loader']
        }
    ]
}

运行

npm run build

调试模式

安装依赖

npm install --save-dev webpack-dev-server

修改 webpack.config.js

const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const CleanWebpackPlugin = require('clean-webpack-plugin');

module.exports = {
  entry: {
    test: './src/test.js'
  },
  output: {
    filename: '[name].js',
    path: path.resolve(__dirname, 'dist')
  },
  // 告知 webpack-dev-server，在 localhost:8080 下建立服务，将 dist 目录下的文件，作为可访问文件。
  devServer: {
    contentBase: './dist'
  },
  plugins: [
    new HtmlWebpackPlugin({
      filename: path.resolve(__dirname, 'dist/index.html'),
      template: path.resolve(__dirname, 'src/test.html'),
      inject: true,
      chunksSortMode: 'dependency'
    }),
    new CleanWebpackPlugin(['dist'])
  ]
};

在 package.json 中添加脚本

"dev": "webpack-dev-server --open"