index.js

const bestPractices = require.resolve('./rules/best-practices');
const errors = require.resolve('./rules/errors');
const es6 = require.resolve('./rules/es6');
const node = require.resolve('./rules/node');
const style = require.resolve('./rules/style');
const variables = require.resolve('./rules/variables');
const prettier = require.resolve('./rules/prettier');

module.exports = {
  extends: [
    'eslint-config-airbnb-base',
    'eslint-config-prettier',
    bestPractices,
    errors,
    es6,
    node,
    style,
    variables,
    prettier
  ],
  plugins: ['jest', 'prettier'],
  parserOptions: {
    ecmaVersion: 2018,
    sourceType: 'module'
  },
  env: {
    node: true
  },
  rules: {
    strict: 'error'
  },
  overrides: [
    {
      files: ['**/*.spec.js', '**/*.test.js', '**/tests-*.js'],
      env: {
        jest: true,
        mocha: true
      },
      rules: {
        'array-bracket-newline': 'off',
        'array-element-newline': 'off',
        'id-length': 'off',
        'jest/consistent-test-it': [
          'error',
          {
            fn: 'test',
            withinDescribe: 'test'
          }
        ],
        'jest/no-alias-methods': 'error',
        'jest/no-commented-out-tests': 'error',
        'jest/no-disabled-tests': 'error',
        'jest/no-duplicate-hooks': 'error',
        'jest/no-export': 'error',
        'jest/no-focused-tests': 'error',
        'jest/no-identical-title': 'error',
        'jest/no-if': 'error',
        'jest/no-jasmine-globals': 'error',
        'jest/no-jest-import': 'error',
        'jest/no-large-snapshots': 'error',
        'jest/no-standalone-expect': 'error',
        'jest/no-test-prefixes': 'error',
        'jest/no-test-callback': 'error',
        'jest/no-test-return-statement': 'error',
        'jest/no-truthy-falsy': 'error',
        'jest/no-try-expect': 'error',
        'jest/prefer-strict-equal': 'error',
        'jest/prefer-to-be-null': 'error',
        'jest/prefer-to-be-undefined': 'error',
        'jest/prefer-to-contain': 'error',
        'jest/prefer-to-have-length': 'error',
        'jest/prefer-todo': 'error',
        'jest/require-to-throw-message': 'error',
        'jest/valid-describe': 'error',
        'jest/valid-expect-in-promise': 'error',
        'jest/valid-expect': 'error',
        'jest/valid-title': 'error',
        'max-lines': 'off',
        'max-lines-per-function': 'off',
        'max-nested-callbacks': 'off',
        'max-statements': 'off',
        'newline-after-var': 'off',
        'no-process-env': 'off',
        'no-unused-expressions': 'off',
        'no-unused-vars': 'off',
        'object-curly-newline': 'off',
        'padding-line-between-statements': [
          'error',
          {blankLine: 'always', prev: '*', next: 'return'},
          {blankLine: 'any', prev: ['const', 'let', 'var'], next: '*'},
          {blankLine: 'any', prev: ['const', 'let', 'var'], next: ['const', 'let', 'var']},
          {blankLine: 'always', prev: 'directive', next: '*'},
          {blankLine: 'any', prev: ['for', 'do', 'while'], next: '*'},
          {blankLine: 'any', prev: '*', next: 'for'},
          {blankLine: 'any', prev: 'import', next: '*'},
          {blankLine: 'any', prev: 'import', next: 'import'},
          {blankLine: 'any', prev: 'if', next: '*'},
          {blankLine: 'any', prev: 'function', next: '*'},
          {blankLine: 'any', prev: '*', next: 'function'},
          {blankLine: 'any', prev: '*', next: 'export'},
          {blankLine: 'any', prev: '*', next: 'cjs-export'},
          {blankLine: 'any', prev: 'cjs-import', next: '*'},
          {blankLine: 'any', prev: 'cjs-import', next: 'cjs-import'}
        ]
      }
    }
  ]
};