webpack 配置eslint

1、下载
	cnpm install -D eslint-config-airbnb-base eslint eslint-plugin-import eslint-loader
	
	使用airbnb-base库来进行代码检查
	
2、配置
	 
	module:{
		rules:[
		 {
	        test: /\.js$/,
	        exclude:/node_modules/,	不检查node_modules
	        loader: 'eslint-loader',
	        enforce:'pre',  优先执行该loader,避免其他loader对js文件处理后(如兼容性处理)报错
	        options: {
	          fix:true		检查出错误后自动修复
	        }
	      }
		]
	},
	
	修改package.json,添加eslintConfig,与devDependencies同级设置
	  "eslintConfig": {
	    "extends": "airbnb-base"	使用airbnb-base库进行代码检查
	  }
	  
3、避开代码检查
	在需要避开检查的代码上一行添加如下注释
	//eslint-disable-next-line

代码示例:

const path = require('path')
const HtmlWebpackPlugin = require('html-webpack-plugin');
const MiniCssExtractPlugin= require('mini-css-extract-plugin');
const OptimizeCssAssetsPlugin = require('optimize-css-assets-webpack-plugin');

process.env.NODE_ENV='development'

module.exports = {
     
  entry: './src/js/index.js',
  output: {
     
    filename: 'src/js/build.js',
    path:path.resolve(__dirname,'build')
  },
  module: {
     
    rules: [//创建模块时，匹配请求的规则数组。这些规则能够修改模块的创建方式。这些规则能够对模块(module)应用 loader，或者修改解析器(parser)。
      {
     
        test: /\.css$/, //匹配文件名
        use: [//使用哪些loader
          // 'style-loader', //创建style标签,将js中的css样式资源添加到style标签中生效
          MiniCssExtractPlugin.loader, //取代style-loader,提取js中的css为单独文件
          'css-loader', //css文件变成commonjs模块,里面内容是样式字符串
          {
     
            loader: 'postcss-loader',
            ident: 'postcss',
            options: {
     
              postcssOptions: {
     
                plugins: [['postcss-preset-env',{
     }]]
              }
            }
          }
        ] 
      },
      {
     
        test: /\.less$/,
        use: [
          'style-loader',
          'css-loader', 
          'less-loader', //将less文件编译成css文件
        ]
      },
      {
     
        test: /\.(jpg|png|gif|jfif)$/,
        loader:'url-loader', //依赖于file-loader
        options: {
     
          //图片小于8kb,会处理成base64,即减少请求数量,增大图片体积(请求速度会变慢cn)
          limit: 8 * 1024,
          esModule: false,  //不采用es6模式解析,否则会和html-loader采用的commonjs模式冲突
          name: '[name].[ext]',
          outputPath:'src/images'
        }
      },
      {
     
        test: /\.html$/,
        loader:'html-loader', //处理html文档中的img,负责引入图片,交给url-loader处理
      },
      {
     
        // exclude:/\.xx$/
        test: /\.(ttf|eot|svg|woff|woff2)$/,
        loader: 'file-loader',
        options: {
     
          name: '[name].[ext]',
          outputPath:'src/icon'
        },
        
      },
      {
     //不检查node_modules
        test: /\.js$/,
        exclude:/node_modules/,
        loader: 'eslint-loader',
        enforce:'pre',
        options: {
     
          fix:true
        }
      }
    ]
  },
  //插件
  plugins: [
    new HtmlWebpackPlugin({
     
      template:'./src/index.html' //将模板复制成指定文件
    }), //默认传键html文件,并引入打包输出的资源,默认为基本结构
    new MiniCssExtractPlugin({
     
      filename: 'src/css/build.css'
    }),
    new OptimizeCssAssetsPlugin()
  ],
  mode: 'development',
  //自动化,自动编译、打开浏览器和自动刷新等
  devServer: {
     
    // contentBase:['xx','xx',...]
    contentBase: path.resolve(__dirname, 'build'), //提供内容的目录
    //启动gzip压缩
    compress: true,
    port: 3000, //监听端口号
    open:true, //自动打开浏览器
  }
}

package.json:

{
     
  "name": "demo1",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
     
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC",
  "devDependencies": {
     
    "css-loader": "^5.0.1",
    "eslint": "^7.17.0",
    "eslint-config-airbnb-base": "^14.2.1",
    "eslint-loader": "^4.0.2",
    "eslint-plugin-import": "^2.22.1",
    "file-loader": "^6.2.0",
    "html-loader": "^0.5.5",
    "html-webpack-plugin": "^4.5.1",
    "less": "^3.13.1",
    "less-loader": "^7.2.1",
    "mini-css-extract-plugin": "^1.3.3",
    "optimize-css-assets-webpack-plugin": "^5.0.4",
    "postcss-loader": "^4.1.0",
    "postcss-preset-env": "^6.7.0",
    "style-loader": "^2.0.0",
    "url-loader": "^4.1.1",
    "webpack": "^4.41.6",
    "webpack-cli": "^3.3.11",
    "webpack-dev-server": "^3.11.1"
  },
  "browserslist": {
     
    "development": [
      "last 1 chrome version",
      "last 1 firefox version",
      "last 1 safari version"
    ],
    "production": [
      ">0.2%",
      "not dead",
      "not op_mini all"
    ]
  },
  "eslintConfig": {
     
    "extends": "airbnb-base"
  }
}