项目目录升级——webpack-merage扩展配置文件

webpack-merge   扩展配置文件

 配置文件对比：

webpack.coonfig.js

const path = require('path');
const isDev = process.env.NODE_ENV === 'development';
const HTMLPlugin = require('html-webpack-plugin');
const VueLoaderPlugin = require('vue-loader/lib/plugin');
const ExtractPlugin = require('extract-text-webpack-plugin'); //把非js代码打包成单独的资源文件，提高效率
const webpack = require('webpack');
const config = {
  target: 'web',
  entry: path.join(__dirname, 'src/index.js'), //__dirname 当前文件所在的目录地址
  output: {
    filename: 'bundle.js',
    path: path.join(__dirname, 'dist'),
  },
  module: {
    rules: [
      {
        test: /.vue$/,
        loader: 'vue-loader',
      },
      {
        test: /.jsx$/,
        loader: 'babel-loader',
      },
      {
        test: /.(gif|jpg|jpeg|png|svg)$/,
        use: [
          {
            loader: 'url-loader',
            options: {
              limit: 1024,
              name: '[name]-aaa.[ext]',
            },
          },
        ],
      },
    ],
  },
  plugins: [
    new webpack.DefinePlugin({
      'process.env': {
        NODE_ENV: isDev ? '"development"' : '"production"',
      },
    }),
    new VueLoaderPlugin(),
    new HTMLPlugin(),
  ],
  mode: 'development',
};
//判断开发环境和正式环境   cross-env 运行跨平台设置和用环境变量的脚本
if (isDev) {
  config.module.rules.push({
    test: /.styl/,
    use: [
      'style-loader',
      'css-loader',
      {
        loader: 'postcss-loader',
        options: {
          sourceMap: true,
        },
      },
      'stylus-loader',
    ],
  });
  config.devtool = '#cheap-module-eval-source-map';
  config.devServer = {
    port: 8000,
    host: '0.0.0.0',
    overlay: {
      errors: true,
    },
    hot: true,
    // open: true
  };
  config.plugins.push(
    new webpack.HotModuleReplacementPlugin(),
    new webpack.NoEmitOnErrorsPlugin()
  );
} else {
    //正式环境
  // config.enter={
  //   app:path.join(__dirname,'src/index.js'),
  //   vender:['vue']//可以添加相关的第三方库
  // }
  config.output.filename = '[name].[chunkhash:8].js';
  config.module.rules.push({
    test: /.styl/,
    use: ExtractPlugin.extract({
      fallback: 'style-loader',
      use: [
        'css-loader',
        {
          loader: 'postcss-loader',
          options: {
            sourceMap: true,
          },
        },
        'stylus-loader',
      ],
    }),
  });
  config.plugins.push(
    new ExtractPlugin('styles.[contentHash:hex:8].css'),
    // new webpack.optimize.CommonsChunkPlugin({
    //   name:'vendor'
    // })
    );
    config.optimization={
      splitChunks:{
        cacheGroups:{
          commons:{
            name:'vender',
          }
        }
      },
      runtimeChunk:true
    }
}
module.exports = config;

修改后，配置文件位于build下：

　　webpack.config.base.js  //公共配置,基础配置

const path = require('path');
const config = {
  target: 'web',
  entry: path.join(__dirname, '../src/index.js'), //__dirname 当前文件所在的目录地址   注意这里的路径有修改
  output: {
    filename: 'bundle.js',
    path: path.join(__dirname, 'dist'),
  },
  module: {
    rules: [
      {
        test: /.vue$/,
        loader: 'vue-loader',
        exclude:/node_modules/  //node_modules中的.vue文件不需要编译
      },
      {
        test: /.jsx$/,
        loader: 'babel-loader',
      },
      {
        test: /.js$/,
        loader: 'babel-loader',
        exclude:__dirname+'node_modules',
        include:__dirname+'src',
        options: {
            presets: ['env']
        },
      },
      {
        test: /.(gif|jpg|jpeg|png|svg)$/,
        use: [
          {
            loader: 'url-loader',
            options: {
              limit: 1024,
              name: 'resources/[path][name].[hash:8].[ext]',
            },
          },
        ],
      },
    ],
  }
};
module.exports = config;

　　webpack.config.client.js

const path = require('path');
const isDev = process.env.NODE_ENV === 'development';
const HTMLPlugin = require('html-webpack-plugin');
const ExtractPlugin = require('extract-text-webpack-plugin'); //把非js代码打包成单独的资源文件，提高效率
const webpack = require('webpack');
const merge=require('webpack-merge');
const baseConfig=require('./webpack.config.base');
const VueLoaderPlugin = require('vue-loader/lib/plugin');

//判断开发环境和正式环境   cross-env 运行跨平台设置和用环境变量的脚本
const defaultPlugins=[
  new webpack.DefinePlugin({
    'process.env':{
      NODE_ENV:isDev?'"development"':'"production"'
    }
  }),
  new VueLoaderPlugin(),
  new HTMLPlugin(),

]
const devServer={
    port: 8000,
    host: '0.0.0.0',
    overlay: {
      errors: true,
    },
    hot: true,
    // open: true
  }
let config
if (isDev) {
//第二个参数——对象会对第一个参数进行覆盖和补充
    config=merge(baseConfig,{
        module:{
            rules:[{
                test: /.styl/,
                use: [
                  'style-loader',
                  'css-loader',
                  {
                    loader: 'postcss-loader',
                    options: {
                      sourceMap: true,
                    },
                  },
                  'stylus-loader',
                ],
              }]
        },
        devtool:'#cheap-module-eval-source-map',
        devServer,
        plugins:defaultPlugins.concat([
          new webpack.HotModuleReplacementPlugin(),
          new webpack.NoEmitOnErrorsPlugin()
        ])
    })
} else {
    //正式环境
  config=merge(baseConfig,{
      enter:{
          app:path.join(__dirname,'../src/index.js'),
          vendor:['vue']
      },
      output:{
        filename:'[name].[chunkhash:8].js'
      },
      module:{
          rules:[
            {
                test: /.styl/,
                use: ExtractPlugin.extract({
                  fallback: 'style-loader',
                  use: [
                    'css-loader',
                    {
                      loader: 'postcss-loader',
                      options: {
                        sourceMap: true,
                      },
                    },
                    'stylus-loader',
                  ],
                }),
              }
          ]
      },
      plugins:defaultPlugins.concat([
        new ExtractPlugin('styles.[contentHash:hex:8].css'),
      ]),
      optimization:{
        splitChunks:{
            cacheGroups:{
              commons:{
                name:'vendor',
              }
            }
          },
          runtimeChunk:true
      }
  })
}
module.exports = config;

package.json也需要进行相应的修改：

  "scripts": {
    "test": "echo "Error: no test specified" && exit 1",
    "build": "cross-env NODE_ENV=production webpack --config build/webpack.config.client.js","dev": "cross-env NODE_ENV=development webpack-dev-server --config build/webpack.config.client.js"
  },