.eslintrc.js

module.exports = {
  'extends': 'eslint:recommended',
  'env': {
    'node': true,
    'es6': true,
    'jest/globals': true
  },
  'parserOptions': {
    'ecmaVersion': 2018
  },
  'plugins': ['jest'],
  'rules': {
    'array-bracket-newline': ['error', 'consistent'],
    'array-bracket-spacing': 'error',
    'block-spacing': 'error',
    'brace-style': ['error', '1tbs', { 'allowSingleLine': true }],
    'camelcase': 'error',
    'comma-dangle': 'error',
    'comma-spacing': 'error',
    'comma-style': 'error',
    'computed-property-spacing': 'error',
    'eol-last': 'error',
    'func-call-spacing': 'error',
    'indent': ['error', 2, { 'SwitchCase': 1, 'CallExpression': { 'arguments': 1 } }],
    'key-spacing': 'error',
    'keyword-spacing': 'error',
    'lines-between-class-members': 'error',
    'multiline-comment-style': 'error',
    'no-console': 'off',
    'no-lonely-if': 'error',
    'no-multi-assign': 'error',
    'no-multiple-empty-lines': 'error',
    'no-trailing-spaces': 'error',
    'no-unneeded-ternary': 'error',
    'no-whitespace-before-property': 'error',
    'nonblock-statement-body-position': 'error',
    'object-curly-newline': ['error', { 'multiline': true, 'consistent': true }],
    'object-curly-spacing': ['error', 'always'],
    'one-var': ['error', 'never'],
    'padded-blocks': ['error', 'never'],
    'quotes': ['error', 'single', { 'allowTemplateLiterals': true }],
    'semi': ['error', 'never'],
    'space-before-blocks': 'error',
    'space-before-function-paren': ['error', { 'anonymous': 'never', 'named': 'never', 'asyncArrow': 'always' }],
    'space-in-parens': 'error',

    'arrow-parens': ['error', 'as-needed'],
    'arrow-spacing': 'error',
    'no-duplicate-imports': 'error',
    'no-var': 'error',
    'prefer-arrow-callback': 'error',
    'prefer-const': 'error',
    'prefer-rest-params': 'error',
    'prefer-spread': 'error',
    'rest-spread-spacing': 'error',
    'template-curly-spacing': 'error',
  }
}