.eslintrc.js

module.exports = {
  env: {
    es6: true,
    node: true,
    mocha: true
  },
  extends: 'eslint:recommended',
  globals: {
    factory: true
  },
  parser: 'babel-eslint',
  parserOptions: {
    ecmaFeatures: {
      impliedStrict: true,
      modules: true
    },
    ecmaVersion: 8,
    sourceType: 'module'
  },
  plugins: ['prettier'],
  rules: {
    'prettier/prettier': [
      2,
      { trailingComma: 'es5', singleQuote: true, bracketSpacing: false }
    ],
    'array-bracket-spacing': 2,
    'no-return-assign': 0,
    'array-callback-return': 2,
    'arrow-body-style': 0,
    'arrow-parens': [0, 'as-needed'],
    'arrow-spacing': 2,
    'block-scoped-var': 2,
    'brace-style': [2, '1tbs', { allowSingleLine: false }],
    camelcase: 0,
    'class-methods-use-this': 0,
    'comma-dangle': [
      2,
      {
        objects: 'always-multiline',
        arrays: 'always-multiline',
        imports: 'always-multiline',
        exports: 'always-multiline',
        functions: 'never'
      }
    ],
    'comma-spacing': 2,
    'comma-style': 2,
    complexity: 1,
    'computed-property-spacing': 2,
    'consistent-return': 0,
    'consistent-this': [2, 'self'],
    'constructor-super': 2,
    curly: 1,
    'dot-location': [2, 'property'],
    'dot-notation': [2, { allowPattern: '^[a-z]+(_[a-z]+)+$' }],
    eqeqeq: [2, 'smart'],
    'func-call-spacing': 2,
    'func-names': 2,
    'func-style': [2, 'declaration', { allowArrowFunctions: true }],
    'generator-star-spacing': 2,
    'global-require': 2,
    'guard-for-in': 2,
    'id-blacklist': 0,
    indent: [2, 2, { SwitchCase: 1 }],
    'key-spacing': 2,
    'keyword-spacing': 2,
    'line-comment-position': 1,
    'linebreak-style': 2,
    'lines-around-comment': [
      0,
      {
        beforeBlockComment: true,
        beforeLineComment: true,
        allowBlockStart: true,
        allowBlockEnd: true
      }
    ],
    'max-lines': 0,
    'max-nested-callbacks': [0, { max: 3 }],
    'max-statements-per-line': 2,
    'multiline-ternary': 0,
    'new-cap': 2,
    'new-parens': 2,
    'newline-per-chained-call': 0,
    'no-array-constructor': 2,
    'no-caller': 2,
    'no-case-declarations': 2,
    'no-class-assign': 2,
    'no-cond-assign': 2,
    'no-confusing-arrow': 2,
    'no-console': 2,
    'no-const-assign': 2,
    'no-constant-condition': 2,
    'no-debugger': 2,
    'no-div-regex': 2,
    'no-dupe-args': 2,
    'no-dupe-class-members': 2,
    'no-dupe-keys': 2,
    'no-duplicate-case': 2,
    'no-duplicate-imports': [0, { includeExports: true }],
    'no-else-return': 2,
    'no-empty-function': 0,
    'no-empty-pattern': 2,
    'no-empty': 2,
    'no-eval': 2,
    'no-ex-assign': 2,
    'no-extend-native': 2,
    'no-extra-bind': 2,
    'no-extra-label': 2,
    'no-extra-parens': 0,
    'no-extra-semi': 2,
    'no-fallthrough': 2,
    'no-floating-decimal': 2,
    'no-func-assign': 2,
    'no-global-assign': 2,
    'no-implicit-coercion': 2,
    'no-implicit-globals': 0,
    'no-implied-eval': 2,
    'no-inner-declarations': 0,
    'no-invalid-regexp': 2,
    'no-irregular-whitespace': 2,
    'no-iterator': 2,
    'no-labels': 2,
    'no-lone-blocks': 2,
    'no-lonely-if': 2,
    'no-loop-func': 2,
    'no-magic-numbers': 0,
    'no-mixed-operators': 2,
    'no-mixed-spaces-and-tabs': 2,
    'no-multi-spaces': 2,
    'no-multi-str': 2,
    'no-multiple-empty-lines': [2, { max: 1 }],
    'no-native-reassign': 2,
    'no-negated-condition': 2,
    'no-nested-ternary': 2,
    'no-new-func': 2,
    'no-new-object': 2,
    'no-new-symbol': 2,
    'no-new-wrappers': 2,
    'no-new': 2,
    'no-octal-escape': 2,
    'no-param-reassign': 2,
    'no-process-env': 0,
    'no-process-exit': 2,
    'no-proto': 2,
    'no-redeclare': 2,
    'no-return-assign': [2, 'always'],
    'no-self-assign': [2, { props: true }],
    'no-self-compare': 2,
    'no-sequences': 2,
    'no-shadow-restricted-names': 2,
    'no-shadow': 2,
    'no-spaced-func': 2,
    'no-tabs': 2,
    'no-template-curly-in-string': 2,
    'no-ternary': 0,
    'no-this-before-super': 2,
    'no-throw-literal': 0,
    'no-trailing-spaces': 2,
    'no-undef-init': 2,
    'no-undefined': 2,
    'no-underscore-dangle': 0,
    'no-unmodified-loop-condition': 2,
    'no-unneeded-ternary': [2, { defaultAssignment: false }],
    'no-unreachable': 2,
    'no-unsafe-finally': 2,
    'no-unsafe-negation': 2,
    'no-unused-expressions': 2,
    'no-unused-vars': [2, { varsIgnorePattern: '^_', argsIgnorePattern: '^_' }],
    'no-use-before-define': [
      2,
      { classes: false, functions: false, variables: false }
    ],
    'no-useless-computed-key': 2,
    'no-useless-concat': 2,
    'no-useless-constructor': 2,
    'no-useless-escape': 2,
    'no-useless-rename': 2,
    'no-var': 2,
    'no-void': 2,
    'no-warning-comments': 1,
    'no-whitespace-before-property': 2,
    'no-with': 2,
    'object-curly-newline': 0,
    'object-curly-spacing': 2,
    'object-property-newline': 0,
    'object-shorthand': 2,
    'one-var-declaration-per-line': 2,
    'one-var': 0,
    'operator-linebreak': 0,
    'padded-blocks': [2, 'never'],
    'prefer-arrow-callback': 2,
    'prefer-const': [2, { destructuring: 'all' }],
    'prefer-numeric-literals': 2,
    'prefer-reflect': 2,
    'prefer-rest-params': 2,
    'prefer-spread': 2,
    'prefer-template': 0,
    'quote-props': [2, 'consistent-as-needed'],
    quotes: [2, 'single', { avoidEscape: true }],
    radix: 2,
    'require-yield': 2,
    'rest-spread-spacing': 2,
    'semi-spacing': 2,
    semi: 2,
    'sort-imports': 0,
    'sort-keys': 0,
    'space-before-blocks': 2,
    'space-in-parens': 2,
    'space-infix-ops': 2,
    'space-unary-ops': [2, { words: true, nonwords: false }],
    'symbol-description': 2,
    'template-curly-spacing': 2,
    'valid-typeof': [2, { requireStringLiterals: true }],
    'vars-on-top': 2,
    'wrap-iife': 2,
    'wrap-regex': 2,
    yoda: 2
  }
};