.eslintrc.js

module.exports = {
  extends: [
    'eslint-config-airbnb-base',
    'eslint-config-airbnb-base/rules/strict'
  ].map(require.resolve),

  parser: 'babel-eslint',

  parserOptions: {
    ecmaVersion: 2017,
    sourceType: 'module',
    ecmaFeatures: {
      experimentalObjectRestSpread: true,
      jsx: true,
      modules: true,
    }
  },

  env: {
    browser: true,
    node: true,
    commonjs: true,
    es6: true,
    jest: true

  },

  root: true,

  rules: {
    'class-methods-use-this': ['off', { exceptMethods: [] }],
    'guard-for-in': 'off',
    'no-alert': 'warn',
    'no-div-regex': 'off',
    'no-else-return': ['off', { allowElseIf: true }],
    'no-implicit-globals': 'off',
    'no-loop-func': 'warn',
    'no-script-url': 'off',
    'no-console': 'off',
    'no-var': 'error',
    'no-constant-condition': 'off',
    'no-case-declarations': 'off',
    'prefer-arrow-callback': ['off', {
      allowNamedFunctions: false,
      allowUnboundThis: true,
    }],
    'prefer-const': ['off', {
      destructuring: 'any',
      ignoreReadBeforeAssign: true,
    }],
    'callback-return': 'off',
    'strict': ['off', 'never'],
    'indent': ['error', 2, {
      SwitchCase: 1,
      VariableDeclarator: 1,
      outerIIFEBody: 1,

      FunctionDeclaration: {
        parameters: 1,
        body: 1,
      },

      FunctionExpression: {
        parameters: 1,
        body: 1,
      },

      CallExpression: {
        arguments: 1,
      },

      ArrayExpression: 1,
      ObjectExpression: 1,
      ImportDeclaration: 1,
      flatTernaryExpressions: false,
      ignoredNodes: ['JSXElement', 'JSXElement *'],
    }],
    'jsx-quotes': ['warn', 'prefer-single'],
    'keyword-spacing': ['warn', {
      before: true,
      after: true,
      overrides: {
        return: { after: true },
        throw: { after: true },
        case: { after: true },
      }
    }],
    'linebreak-style': ['error', 'unix'],
    'lines-around-comment': 'off',
    'max-depth': ['off', 4],
    'max-len': ['off', 100, 2, {
      ignoreUrls: true,
      ignoreComments: false,
      ignoreRegExpLiterals: true,
      ignoreStrings: true,
      ignoreTemplateLiterals: true,
    }],
    'max-lines': ['off', {
      max: 300,
      skipBlankLines: true,
      skipComments: true,
    }],
    'max-nested-callbacks': 'off',
    'max-params': ['warn', 10],
    'max-statements': ['off', 10],
    'max-statements-per-line': ['off', { max: 1 }],
    'multiline-comment-style': ['off', 'starred-block'],
    'no-lonely-if': 'off',
    'quotes': ['error', 'single', { avoidEscape: true }],
    'semi-style': ['error', 'last'],
    'semi': ['error', 'always'],
    'object-shorthand': ['off', 'always', {
      ignoreConstructors: false,
      avoidQuotes: true,
    }],
    'arrow-parens': ['off', 'as-needed', {
      requireForBlockBody: true,
    }],
    'arrow-body-style': 'off',
    'no-plusplus': 'off',
    'no-param-reassign': 'off',
    'import/extensions': 'off',
    'import/prefer-default-export': 'off',
    'import/no-dynamic-require': 'off',
    'import/no-unresolved': 'off',
    'prefer-template': 'off',
    'prefer-rest-params': 'off',
    'radix': 'off',
    'no-mixed-operators': 'off',
    'object-curly-newline': 'off',
    'object-curly-spacing': 'off',
    'prefer-destructuring': 'off',
    'no-restricted-globals': 'off',
    'no-restricted-syntax': 'off',
    'no-prototype-builtins': 'off',
    'func-names': 'off',
    'no-underscore-dangle': 'off',
    'global-require': 'off',
    'array-callback-return': 'off',
    'quote-props': 'off',
    'no-continue': 'off',
    'space-before-function-paren': ['error', {
      anonymous: 'ignore',
      named: 'never',
    }],
    'complexity': ['warn', { max: 25 }],
    'no-shadow': 'off',
    'no-await-in-loop': 'off',
    'comma-dangle': [
      'error',
      'always-multiline',
      {
        arrays: 'never',
        objects: 'always',
        imports: 'never',
        exports: 'never',
        functions: 'ignore'
      }
    ]
  },
};