.eslintrc.js

module.exports = {
  root: true,
  parserOptions: {
    ecmaVersion: 8
  },
  extends: 'eslint:recommended',
  env: {
    browser: false,
    node: true,
    es6: true,
  },
  globals: {
  },
  rules: {
    /*** Possible Errors ***/

    'no-console': 0,
    'no-template-curly-in-string': 2,
    'no-unsafe-negation': 2,

    /*** Best Practices ***/

    'curly': 2,
    'eqeqeq': 2,
    'guard-for-in': 0,
    'no-caller': 2,
    'no-eq-null': 2,
    'no-eval': 2,
    'no-multi-spaces': [2, {
      'exceptions': {
        'ObjectExpression': true,
        'Property': true
      }
    }],
    'no-new': 0,
    'no-unused-expressions': [2, {
      allowShortCircuit: true,
      allowTernary: true
    }],
    'wrap-iife': 0,
    'yoda': 2,

    /*** Strict Mode ***/

    'strict': [2, 'global'],

    /*** Variables ***/

    'no-undef': 2,
    'no-unused-vars': 2,
    'no-use-before-define': [2, 'nofunc'],

    /*** Stylistic Issues ***/

    'array-bracket-spacing': 2,
    'block-spacing': 2,
    'brace-style': [2, '1tbs', {
      'allowSingleLine': true
    }],
    'camelcase': 2,
    'comma-dangle': [2, 'always-multiline'],
    'comma-spacing': 2,
    'comma-style': 2,
    'eol-last': 2,
    'func-call-spacing': 2,
    'indent': [2, 2, {
      'SwitchCase': 1,
      'VariableDeclarator': { 'var': 2, 'let': 2, 'const': 3 }
    }],
    'key-spacing': 2,
    'keyword-spacing': 2,
    'linebreak-style': [2, 'unix'],
    'new-cap': [2, {
      properties: false
    }],
    'new-parens': 2,
    'no-array-constructor': 2,
    'no-bitwise': 2,
    'no-lonely-if': 2,
    'no-mixed-operators': 2,
    'no-plusplus': 0,
    'no-trailing-spaces': 2,
    'no-unneeded-ternary': 2,
    'no-whitespace-before-property': 2,
    'object-curly-spacing': [2, 'always'],
    'semi-spacing': 2,
    'semi': 2,
    'space-before-blocks': 2,
    'space-before-function-paren': [2, 'never'],
    'space-in-parens': 2,
    'space-infix-ops': 2,
    'space-unary-ops': 2,
    'quotes': [2, 'single', {
      'allowTemplateLiterals': true
    }],
    'semi': [2, 'always'],
    'wrap-regex': 2,

    /*** ECMAScript 6 ***/

    'arrow-body-style': 2,
    'arrow-parens': [2, 'as-needed'],
    'arrow-spacing': 2,
    'generator-star-spacing': 2,
    'no-confusing-arrow': [2, {
      'allowParens': true
    }],
    'no-useless-computed-key': 2,
    'no-var': 2,
    'object-shorthand': 2,
    'prefer-arrow-callback': [2, {
      'allowNamedFunctions': true
    }],
    'prefer-template': 2,
    'rest-spread-spacing': 2,
    'symbol-description': 2,
    'template-curly-spacing': 2,
    'yield-star-spacing': 2
  }
};