.eslintrc.js

module.exports = {
  parserOptions: {
    ecmaVersion: 2018,
    ecmaFeatures: {
      jsx: true,
    },
    sourceType: 'module',
  },

  env: {
    es6: true,
    node: true,
  },

  plugins: ['import', 'node', 'promise', 'standard'],

  globals: {
    document: false,
    navigator: false,
    window: false,
  },

  rules: {
    'accessor-pairs': 'error',
    'arrow-spacing': ['error', { before: true, after: true }],
    'block-spacing': ['error', 'always'],
    'brace-style': ['error', '1tbs', { allowSingleLine: true }],
    camelcase: ['error', { properties: 'never' }],
    'comma-dangle': [
      'error',
      {
        arrays: 'only-multiline',
        objects: 'only-multiline',
        imports: 'never',
        exports: 'never',
        functions: 'never',
      },
    ],
    'comma-spacing': ['error', { before: false, after: true }],
    'comma-style': ['error', 'last'],
    'constructor-super': 'error',
    curly: ['error', 'multi-line'],
    'dot-location': ['error', 'property'],
    'eol-last': 'error',
    eqeqeq: ['error', 'always', { null: 'ignore' }],
    'func-call-spacing': ['error', 'never'],
    'generator-star-spacing': ['off', { before: false, after: false }],
    'handle-callback-err': ['error', '^(err|error)$'],
    indent: [
      'error',
      2,
      {
        SwitchCase: 1,
        VariableDeclarator: 1,
        outerIIFEBody: 1,
        MemberExpression: 1,
        FunctionDeclaration: { parameters: 1, body: 1 },
        FunctionExpression: { parameters: 1, body: 1 },
        CallExpression: { arguments: 1 },
        ArrayExpression: 1,
        ObjectExpression: 1,
        ImportDeclaration: 1,
        flatTernaryExpressions: false,
        ignoreComments: false,
      },
    ],
    'key-spacing': ['error', { beforeColon: false, afterColon: true }],
    'keyword-spacing': ['error', { before: true, after: true }],
    'new-cap': ['error', { newIsCap: true, capIsNew: false }],
    'new-parens': 'error',
    'no-array-constructor': 'error',
    'no-caller': 'error',
    'no-class-assign': 'error',
    'no-compare-neg-zero': 'error',
    'no-cond-assign': 'error',
    'no-const-assign': 'error',
    'no-constant-condition': ['error', { checkLoops: false }],
    'no-control-regex': 'error',
    'no-debugger': 'error',
    'no-delete-var': 'error',
    'no-dupe-args': 'error',
    'no-dupe-class-members': 'error',
    'no-dupe-keys': 'error',
    'no-duplicate-case': 'error',
    'no-empty-character-class': 'error',
    'no-empty-pattern': 'error',
    'no-eval': 'error',
    'no-ex-assign': 'error',
    'no-extend-native': 'error',
    'no-extra-bind': 'error',
    'no-extra-boolean-cast': 'error',
    'no-extra-parens': ['error', 'functions'],
    'no-fallthrough': 'error',
    'no-floating-decimal': 'error',
    'no-func-assign': 'error',
    'no-global-assign': 'error',
    'no-implied-eval': 'error',
    'no-inner-declarations': ['error', 'functions'],
    'no-invalid-regexp': 'error',
    'no-irregular-whitespace': 'error',
    'no-iterator': 'error',
    'no-label-var': 'error',
    'no-labels': ['error', { allowLoop: false, allowSwitch: false }],
    'no-lone-blocks': 'error',
    'no-mixed-operators': [
      'error',
      {
        groups: [
          ['==', '!=', '===', '!==', '>', '>=', '<', '<='],
          ['&&', '||'],
          ['in', 'instanceof'],
        ],
        allowSamePrecedence: true,
      },
    ],
    'no-mixed-spaces-and-tabs': 'error',
    'no-multi-spaces': 'error',
    'no-multi-str': 'error',
    'no-multiple-empty-lines': ['error', { max: 1, maxEOF: 0 }],
    'no-negated-in-lhs': 'error',
    'no-new': 'error',
    'no-new-func': 'error',
    'no-new-object': 'error',
    'no-new-require': 'error',
    'no-new-symbol': 'error',
    'no-new-wrappers': 'error',
    'no-obj-calls': 'error',
    'no-octal': 'error',
    'no-octal-escape': 'error',
    'no-path-concat': 'error',
    'no-proto': 'error',
    'no-redeclare': 'error',
    'no-regex-spaces': 'error',
    'no-return-assign': ['error', 'except-parens'],
    'no-return-await': 'error',
    'no-self-assign': 'error',
    'no-self-compare': 'error',
    'no-sequences': 'error',
    'no-shadow-restricted-names': 'error',
    'no-sparse-arrays': 'error',
    'no-tabs': 'error',
    'no-template-curly-in-string': 'error',
    'no-this-before-super': 'error',
    'no-throw-literal': 'error',
    'no-trailing-spaces': 'error',
    'no-undef': 'error',
    'no-undef-init': 'error',
    'no-unexpected-multiline': 'error',
    'no-unmodified-loop-condition': 'error',
    'no-unneeded-ternary': ['error', { defaultAssignment: false }],
    'no-unreachable': 'error',
    'no-unsafe-finally': 'error',
    'no-unsafe-negation': 'error',
    'no-unused-expressions': [
      'error',
      {
        allowShortCircuit: true,
        allowTernary: true,
        allowTaggedTemplates: true,
      },
    ],
    'no-unused-vars': ['error', { vars: 'all', args: 'none', ignoreRestSiblings: true }],
    'no-use-before-define': ['error', { functions: false, classes: false, variables: false }],
    'no-useless-call': 'error',
    'no-useless-computed-key': 'error',
    'no-useless-constructor': 'error',
    'no-useless-escape': 'error',
    'no-useless-rename': 'error',
    'no-useless-return': 'error',
    'no-whitespace-before-property': 'error',
    'no-with': 'error',
    'object-curly-spacing': ['error', 'always'],
    'object-property-newline': ['error', { allowMultiplePropertiesPerLine: true }],
    'one-var': ['error', { initialized: 'never' }],
    'operator-linebreak': ['error', 'after', { overrides: { '?': 'before', ':': 'before' } }],
    'padded-blocks': ['error', { blocks: 'never', switches: 'never', classes: 'never' }],
    'prefer-promise-reject-errors': 'error',
    quotes: ['error', 'single', { avoidEscape: true, allowTemplateLiterals: true }],
    'rest-spread-spacing': ['error', 'never'],
    semi: ['error', 'always'],
    'semi-spacing': ['error', { before: false, after: true }],
    'space-before-blocks': ['error', 'always'],
    'space-before-function-paren': [
      'error',
      {
        anonymous: 'never',
        named: 'never',
        asyncArrow: 'always',
      },
    ],
    'space-in-parens': ['error', 'never'],
    'space-infix-ops': 'error',
    'space-unary-ops': ['error', { words: true, nonwords: false }],
    'spaced-comment': [
      'error',
      'always',
      {
        line: { markers: ['*package', '!', '/', ',', '='] },
        block: {
          balanced: true,
          markers: ['*package', '!', ',', ':', '::', 'flow-include'],
          exceptions: ['*'],
        },
      },
    ],
    'symbol-description': 'error',
    'template-curly-spacing': ['error', 'never'],
    'template-tag-spacing': ['error', 'never'],
    'unicode-bom': ['error', 'never'],
    'use-isnan': 'error',
    'valid-typeof': ['error', { requireStringLiterals: true }],
    'wrap-iife': ['error', 'any', { functionPrototypeMethods: true }],
    'yield-star-spacing': ['error', 'both'],
    yoda: ['error', 'never'],

    'import/export': 'error',
    'import/first': 'error',
    'import/no-duplicates': 'error',
    'import/no-named-default': 'error',
    'import/no-webpack-loader-syntax': 'error',

    'node/no-deprecated-api': 'error',
    'node/process-exit-as-throw': 'error',

    'promise/param-names': 'error',

    'standard/array-bracket-even-spacing': ['error', 'either'],
    'standard/computed-property-even-spacing': ['error', 'even'],
    'standard/no-callback-literal': 'error',
    'standard/object-curly-even-spacing': ['error', 'either'],
  },
};