.eslintrc.js

const noRestrictedProperies = require('eslint-config-airbnb-base/rules/best-practices').rules['no-restricted-properties'].filter(
  rule => !(
    // Disable options which force code that doesn't work in IE11
    (rule.object === 'Math'   && rule.property === 'pow')  ||
    (rule.object === 'window' && rule.property === 'isNaN')
  )
);

module.exports = {
  env: {
    browser : true,
    es6     : true,
    node    : true,
  },
  plugins: [
    'align-assignments',
  ],
  extends: [
    'airbnb-base',
  ],
  parser        : '@babel/eslint-parser',
  parserOptions : {
    requireConfigFile : false,
    ecmaVersion       : 8,
    sourceType        : 'module',
  },
  globals: {
    Genoverse: true,
  },
  ignorePatterns: [
    'node_modules',
    'dist',
    '**/*.min.js',
    'src/js/lib/dalliance/*.js',
    'src/js/lib/jquery-plugins/*.js',
  ],
  rules: {
    'align-assignments/align-assignments' : [ 'error', { requiresOnly: false }],
    'padding-line-between-statements'     : [
      'error', ...[
        [ '*', [ 'multiline-block-like', 'return', 'break', 'export', 'throw', 'cjs-export' ]],
        [ '*', [ 'cjs-import', 'import', 'const', 'let', 'var' ]],
        [[ 'multiline-block-like', 'return', 'break', 'export', 'throw', 'cjs-export' ], '*' ],
        [[ 'cjs-import', 'import', 'const', 'let', 'var' ], '*' ],
        [ 'cjs-import',       'cjs-import', 'any' ],
        [ 'import',           'import', 'any' ],
        [ 'singleline-const', 'const', 'any' ],
        [ 'singleline-let',   'let', 'any' ],
        [ 'singleline-var',   'var', 'any' ],
        [ 'expression',       'expression', 'any' ],
      ].map(
        ([ prev, next = '*', blankLine = 'always' ]) => ({ prev, next, blankLine })
      ),
    ],
    'max-len'                    : 'off',
    'no-multi-spaces'            : 'off',
    'no-multi-assign'            : 'off',
    'no-nested-ternary'          : 'off',
    'no-prototype-builtins'      : 'off',
    'no-plusplus'                : 'off',
    'operator-linebreak'         : 'off',
    'prefer-destructuring'       : 'off',
    'quote-props'                : 'off',
    'template-curly-spacing'     : 'off',
    'yoda'                       : 'off',
    'no-underscore-dangle'       : 'off',
    'newline-per-chained-call'   : 'off',
    'default-param-last'         : 'off',
    'no-promise-executor-return' : 'off',
    'no-continue'                : 'off',
    'no-fallthrough'             : 'off',
    'no-bitwise'                 : 'off',
    'func-names'                 : 'off',
    'no-param-reassign'          : 'off',

    'array-bracket-spacing' : [ 'warn', 'always', { objectsInArrays: false, arraysInArrays: false }],
    'quotes'                : [ 'warn', 'single', { avoidEscape: true }],

    'arrow-parens'                   : [ 'error', 'as-needed', { requireForBlockBody: true }],
    'function-paren-newline'         : [ 'error', 'consistent' ],
    'function-call-argument-newline' : [ 'error', 'consistent' ],
    'linebreak-style'                : [ 'error', 'unix' ],
    'object-shorthand'               : [ 'error', 'consistent' ],

    'comma-dangle': [ 'error', {
      arrays    : 'always-multiline',
      objects   : 'always-multiline',
      imports   : 'always-multiline',
      exports   : 'always-multiline',
      functions : 'never',
    }],
    'key-spacing': [ 'error', {
      singleLine : { beforeColon: false, afterColon: true },
      multiLine  : { beforeColon: false, afterColon: true },
      align      : { beforeColon: true,  afterColon: true, on: 'colon' },
    }],
    'object-curly-newline': [ 'error', {
      ObjectExpression : { multiline: true, consistent: true },
      ObjectPattern    : { multiline: true, consistent: true },
    }],
    'import/no-extraneous-dependencies' : [ 'error' ],
    'import/order'                      : [ 'error', {
      alphabetize : { order: 'asc' },
      groups      : [ 'builtin', 'external', 'internal', 'parent', 'sibling' ],
    }],

    'no-restricted-globals'    : [ 'error', 'event', 'isFinite' ],
    'no-restricted-properties' : noRestrictedProperies,

    'consistent-return': 'off', // FIXME: async functions and $.events
  },
  overrides: [
    {
      files   : [ 'test/**/*.js' ],
      globals : {
        jest       : true,
        describe   : true,
        it         : true,
        expect     : true,
        fail       : true,
        beforeAll  : true,
        afterAll   : true,
        afterEach  : true,
        beforeEach : true,
      },
    },
  ],
};