webpack入门第五集:配置开发生产环境，超级简单

模块全部下载保存下来，方便教程创建demo5

npm init -y
npm install -y  webpack webpack-cli lodash  style-loader css-loader file-loader  csv-loader xml-loader  webpack-dev-server

说白了就是配置多个文件而已，这里用到了合并的追加形式，单个文件也可以

创建一个公用文件

npm install --save-dev webpack-merge
npm install --save-dev uglifyjs-webpack-plugin

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

module.exports = {
    entry: {
        app: './src/index.js'
    },
    plugins: [
        new CleanWebpackPlugin(),
        new HtmlWebpackPlugin({
            title: 'Production'
        })
    ],
    output: {
        filename: '[name].bundle.js',
        path: path.resolve(__dirname, 'dist')
    }
};

开发环境dev

const merge = require('webpack-merge');
const common = require('./webpack.common.js');
    // 这里实现2个模块对象合并
     module.exports = merge(common, {
       devtool: 'inline-source-map',
       devServer: {
         contentBase: './dist'
       }
 });

生产环境

const merge = require('webpack-merge');
const UglifyJSPlugin = require('uglifyjs-webpack-plugin');
const common = require('./webpack.common.js');
module.exports = merge(common, {
    plugins: [
        new UglifyJSPlugin()
    ]
});

修改package.json

{
  "name": "demo4",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "start": "webpack-dev-server --open --config webpack.dev.js",
    "build": "webpack --config webpack.prod.js"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "dependencies": {
    "css-loader": "^3.0.0",
    "csv-loader": "^3.0.2",
    "file-loader": "^4.0.0",
    "lodash": "^4.17.11",
    "style-loader": "^0.23.1",
    "webpack": "^4.33.0",
    "webpack-cli": "^3.3.4",
    "webpack-dev-server": "^3.7.1",
    "xml-loader": "^1.2.1"
  },
  "devDependencies": {
    "uglifyjs-webpack-plugin": "^2.1.3",
    "webpack-merge": "^4.2.1"
  }
}

执行

npm run start 开发
npm run build 生产