.eslintrc.js

module.exports = {
  root: true,
  parserOptions: {
    ecmaVersion: 2018,
    sourceType: 'module',
  },
  env: {
    node: true,
    jest: true,
  },
  extends: [
    'eslint:all',
    'plugin:promise/recommended',
    'plugin:jest/all',
  ],
  plugins: [
    // eslint-plugin-jest
    'jest',
  ],
  rules: {
    'array-bracket-newline': ['error', 'consistent'],
    'array-element-newline': 'off',
    'arrow-body-style': 'off',
    'brace-style': ['error', '1tbs', {allowSingleLine: true}],
    camelcase: 'warn',
    'capitalized-comments': ['warn', 'always', {
      ignoreConsecutiveComments: true,
    }],
    'comma-dangle': ['error', 'always-multiline'],
    curly: ['error', 'multi-line'],
    'dot-location': ['error', 'property'],
    eqeqeq: ['error', 'smart'],
    'func-names': 'off',
    'func-style': ['error', 'declaration', {allowArrowFunctions: true}],
    'function-call-argument-newline': ['error', 'consistent'],
    'guard-for-in': 'off',
    'id-length': 'off',
    indent: ['error', 2],
    'init-declarations': 'off',
    'line-comment-position': 'off',
    'linebreak-style': ['error', 'unix'],
    'lines-around-comment': 'off',
    'max-len': ['warn', {ignoreTrailingComments: true}],
    'max-lines-per-function': 'off',
    'max-statements': 'off',
    'max-statements-per-line': 'off',
    'multiline-comment-style': ['error', 'separate-lines'],
    'multiline-ternary': ['error', 'always-multiline'],
    'new-cap': 'off',
    // 'babel/new-cap': 1,
    'newline-per-chained-call': 'off',
    'no-alert': 'warn',
    'no-confusing-arrow': 'off',
    'no-console': 'warn',
    'no-continue': 'off',
    'no-eq-null': 'off',
    'no-extra-semi': 'error',
    'no-inline-comments': 'off',
    'babel/no-invalid-this': 2,
    'no-invalid-this': 'off',
    'no-magic-numbers': 'off',
    'no-mixed-operators': 'off',
    'no-multi-assign': 'off',
    'no-multi-str': 'off',
    'no-new': 'warn',
    'no-plusplus': 'off',
    'no-prototype-builtins': 'off',
    'no-ternary': 'off',
    'no-underscore-dangle': 'off',
    // 'babel/no-unused-expressions': 1,
    'no-unused-expressions': ['error', {
      allowShortCircuit: true,
      allowTernary: true,
      allowTaggedTemplates: true,
    }],
    'no-unused-vars': 'warn',
    'no-use-before-define': 'off',
    'no-warning-comments': 'warn',
    'object-curly-newline': 'off',
    // 'babel/object-curly-spacing': 1,
    'object-property-newline': ['error', {
      allowAllPropertiesOnSameLine: true,
    }],
    'one-var': ['error', 'never'],
    'padded-blocks': ['error', 'never'],
    'prefer-destructuring': 'warn',
    'quote-props': ['error', 'as-needed'],
    // 'babel/quotes': 1,
    quotes: ['error', 'single', {avoidEscape: true}],
    'require-jsdoc': 'off',
    // 'babel/semi': 1,
    semi: ['error', 'never'],
    'sort-imports': 'off',
    'sort-keys': 'off',
    'space-before-function-paren': ['error', {
      anonymous: 'always',
      named: 'never',
      asyncArrow: 'always',
    }],
    // 'babel/valid-typeof': 1
  },
}