eslint 7.5.0如何支持 js 链操作符

mikechen
  • 595

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RT 在 vue 开发的时候 参考
https://www.it1352.com/206735...
已经把 eslint 更新到 7.5.0 相关配置如下图 但是就是不生效
image.png
image.png

  • vue.config.js

    'use strict'
    const path = require('path')
    const defaultSettings = require('./src/settings.js')
    
    function resolve(dir) {
    return path.join(__dirname, dir)
    }
    
    const name = defaultSettings.title // page title
    
    // If your port is set to 80,
    // use administrator privileges to execute the command line.
    // For example, Mac: sudo npm run
    // You can change the port by the following methods:
    // port = 9528 npm run dev OR npm run dev --port = 9528
    const port = process.env.port || process.env.npm_config_port || 9528 // dev port
    
    // All configuration item explanations can be find in https://cli.vuejs.org/config/
    module.exports = {
    /**
     * You will need to set publicPath if you plan to deploy your site under a sub path,
     * for example GitHub Pages. If you plan to deploy your site to https://foo.github.io/bar/,
     * then publicPath should be set to "/bar/".
     * In most cases please use '/' !!!
     * Detail: https://cli.vuejs.org/config/#publicpath
     */
    publicPath: './',
    outputDir: 'dist',
    assetsDir: 'static',
    lintOnSave: process.env.NODE_ENV === 'development',
    productionSourceMap: false,
    devServer: {
      port: port,
      open: false,
      overlay: {
        warnings: false,
        errors: true
      },
      proxy: {
        '/': {
          target: process.env.VUE_APP_BASE_API,
          // target: 'http://xxxxxxx',
          ws: false,
          changeOrigin: true,
          pathRewrite: {
            '^/': '/'
          }
        }
      }
      // before: require('./mock/mock-server.js')
    },
    configureWebpack: {
      // provide the app's title in webpack's name field, so that
      // it can be accessed in index.html to inject the correct title.
      name: name,
      resolve: {
        alias: {
          '@': resolve('src'),
          '@crud': resolve('src/components/Crud'),
          '@components': resolve('src/components')
          // mock: resolve('mock')
        }
      }
    },
    chainWebpack(config) {
      // it can improve the speed of the first screen, it is recommended to turn on preload
      config.plugin('preload').tap(() => [
        {
          rel: 'preload',
          // to ignore runtime.js
          // https://github.com/vuejs/vue-cli/blob/dev/packages/@vue/cli-service/lib/config/app.js#L171
          fileBlacklist: [/\.map$/, /hot-update\.js$/, /runtime\..*\.js$/],
          include: 'initial'
        }
      ])
    
      // when there are many pages, it will cause too many meaningless requests
      config.plugins.delete('prefetch')
    
      // set svg-sprite-loader
      config.module
        .rule('svg')
        .exclude.add(resolve('src/icons'))
        .end()
      config.module
        .rule('icons')
        .test(/\.svg$/)
        .include.add(resolve('src/icons'))
        .end()
        .use('svg-sprite-loader')
        .loader('svg-sprite-loader')
        .options({
          symbolId: 'icon-[name]'
        })
        .end()
    
      config.when(process.env.NODE_ENV !== 'development', config => {
        config
          .plugin('ScriptExtHtmlWebpackPlugin')
          .after('html')
          .use('script-ext-html-webpack-plugin', [
            {
              // `runtime` must same as runtimeChunk name. default is `runtime`
              inline: /runtime\..*\.js$/
            }
          ])
          .end()
        config.optimization.splitChunks({
          chunks: 'all',
          cacheGroups: {
            libs: {
              name: 'chunk-libs',
              test: /[\\/]node_modules[\\/]/,
              priority: 10,
              chunks: 'initial' // only package third parties that are initially dependent
            },
            elementUI: {
              name: 'chunk-elementUI', // split elementUI into a single package
              priority: 20, // the weight needs to be larger than libs and app or it will be packaged into libs or app
              test: /[\\/]node_modules[\\/]_?element-ui(.*)/ // in order to adapt to cnpm
            },
            commons: {
              name: 'chunk-commons',
              test: resolve('src/components'), // can customize your rules
              minChunks: 3, //  minimum common number
              priority: 5,
              reuseExistingChunk: true
            }
          }
        })
        // https:// webpack.js.org/configuration/optimization/#optimizationruntimechunk
        config.optimization.runtimeChunk('single')
      })
    }
    }
  • .eslint.js

    module.exports = {
    root: true,
    parserOptions: {
      parser: 'babel-eslint',
      ecmaVersion: 2020,
      sourceType: 'module'
    },
    env: {
      browser: true,
      node: true,
      es6: true,
    },
    extends: ['plugin:vue/recommended', 'eslint:recommended'],
    
    // add your custom rules here
    //it is base on https://github.com/vuejs/eslint-config-vue
    rules: {
      "vue/max-attributes-per-line": [2, {
        "singleline": 10,
        "multiline": {
          "max": 1,
          "allowFirstLine": false
        }
      }],
      "vue/singleline-html-element-content-newline": "off",
      "vue/multiline-html-element-content-newline":"off",
      "vue/name-property-casing": ["error", "PascalCase"],
      "vue/no-v-html": "off",
      'accessor-pairs': 2,
      'arrow-spacing': [2, {
        'before': true,
        'after': true
      }],
      'block-spacing': [2, 'always'],
      'brace-style': [2, '1tbs', {
        'allowSingleLine': true
      }],
      'camelcase': [0, {
        'properties': 'always'
      }],
      'comma-dangle': [2, 'never'],
      'comma-spacing': [2, {
        'before': false,
        'after': true
      }],
      'comma-style': [2, 'last'],
      'constructor-super': 2,
      'curly': [2, 'multi-line'],
      'dot-location': [2, 'property'],
      'eol-last': 2,
      'eqeqeq': ["error", "always", {"null": "ignore"}],
      'generator-star-spacing': [2, {
        'before': true,
        'after': true
      }],
      'handle-callback-err': [2, '^(err|error)$'],
      'indent': [2, 2, {
        'SwitchCase': 1
      }],
      'jsx-quotes': [2, 'prefer-single'],
      'key-spacing': [2, {
        'beforeColon': false,
        'afterColon': true
      }],
      'keyword-spacing': [2, {
        'before': true,
        'after': true
      }],
      'new-cap': [2, {
        'newIsCap': true,
        'capIsNew': false
      }],
      'new-parens': 2,
      'no-array-constructor': 2,
      'no-caller': 2,
      'no-console': 'off',
      'no-class-assign': 2,
      'no-cond-assign': 2,
      'no-const-assign': 2,
      'no-control-regex': 0,
      'no-delete-var': 2,
      'no-dupe-args': 2,
      'no-dupe-class-members': 2,
      'no-dupe-keys': 2,
      'no-duplicate-case': 2,
      'no-empty-character-class': 2,
      'no-empty-pattern': 2,
      'no-eval': 2,
      'no-ex-assign': 2,
      'no-extend-native': 2,
      'no-extra-bind': 2,
      'no-extra-boolean-cast': 2,
      'no-extra-parens': [2, 'functions'],
      'no-fallthrough': 2,
      'no-floating-decimal': 2,
      'no-func-assign': 2,
      'no-implied-eval': 2,
      'no-inner-declarations': [2, 'functions'],
      'no-invalid-regexp': 2,
      'no-irregular-whitespace': 2,
      'no-iterator': 2,
      'no-label-var': 2,
      'no-labels': [2, {
        'allowLoop': false,
        'allowSwitch': false
      }],
      'no-lone-blocks': 2,
      'no-mixed-spaces-and-tabs': 2,
      'no-multi-spaces': 2,
      'no-multi-str': 2,
      'no-multiple-empty-lines': [2, {
        'max': 1
      }],
      'no-native-reassign': 2,
      'no-negated-in-lhs': 2,
      'no-new-object': 2,
      'no-new-require': 2,
      'no-new-symbol': 2,
      'no-new-wrappers': 2,
      'no-obj-calls': 2,
      'no-octal': 2,
      'no-octal-escape': 2,
      'no-path-concat': 2,
      'no-proto': 2,
      'no-redeclare': 2,
      'no-regex-spaces': 2,
      'no-return-assign': [2, 'except-parens'],
      'no-self-assign': 2,
      'no-self-compare': 2,
      'no-sequences': 2,
      'no-shadow-restricted-names': 2,
      'no-spaced-func': 2,
      'no-sparse-arrays': 2,
      'no-this-before-super': 2,
      'no-throw-literal': 2,
      'no-trailing-spaces': 2,
      'no-undef': 2,
      'no-undef-init': 2,
      'no-unexpected-multiline': 2,
      'no-unmodified-loop-condition': 2,
      'no-unneeded-ternary': [2, {
        'defaultAssignment': false
      }],
      'no-unreachable': 2,
      'no-unsafe-finally': 2,
      'no-unused-vars': [2, {
        'vars': 'all',
        'args': 'none'
      }],
      'no-useless-call': 2,
      'no-useless-computed-key': 2,
      'no-useless-constructor': 2,
      'no-useless-escape': 0,
      'no-whitespace-before-property': 2,
      'no-with': 2,
      'one-var': [2, {
        'initialized': 'never'
      }],
      'operator-linebreak': [2, 'after', {
        'overrides': {
          '?': 'before',
          ':': 'before'
        }
      }],
      'padded-blocks': [2, 'never'],
      'quotes': [2, 'single', {
        'avoidEscape': true,
        'allowTemplateLiterals': true
      }],
      'semi': [2, 'never'],
      'semi-spacing': [2, {
        'before': false,
        'after': true
      }],
      'space-before-blocks': [2, 'always'],
      'space-before-function-paren': [2, 'never'],
      'space-in-parens': [2, 'never'],
      'space-infix-ops': 2,
      'space-unary-ops': [2, {
        'words': true,
        'nonwords': false
      }],
      'spaced-comment': [2, 'always', {
        'markers': ['global', 'globals', 'eslint', 'eslint-disable', '*package', '!', ',']
      }],
      'template-curly-spacing': [2, 'never'],
      'use-isnan': 2,
      'valid-typeof': 2,
      'wrap-iife': [2, 'any'],
      'yield-star-spacing': [2, 'both'],
      'yoda': [2, 'never'],
      'prefer-const': 2,
      'no-debugger': process.env.NODE_ENV !== 'development' ? 2 : 0,
      'object-curly-spacing': [2, 'always', {
        objectsInObjects: false
      }],
      'array-bracket-spacing': [2, 'never']
    }
    }
  • babel.config.js

    module.exports = {
    presets: [
      // https://github.com/vuejs/vue-cli/tree/master/packages/@vue/babel-preset-app
      '@vue/cli-plugin-babel/preset'
    ],
    plugins: ['@babel/plugin-proposal-optional-chaining'],
    env: {
      development: {
        // babel-plugin-dynamic-import-node plugin only does one thing by converting all import() to require().
        // This plugin can significantly increase the speed of hot updates, when you have a large number of pages.
        // https://panjiachen.github.io/vue-element-admin-site/guide/advanced/lazy-loading.html
        plugins: [
          'dynamic-import-node',
          '@babel/plugin-proposal-optional-chaining'
        ]
      }
    }
    }
回复
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1 个回答

因为你不是直接用的 ESLint,而是通过 babel-eslint 调用的,你得先让 babel 认识这个语法。

先添加 @babel/plugin-proposal-optional-chaining 这个插件,怎么添加可以自己搜一下。

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