Airbnb JavaScript Style Guide(github.com)

  [1]: https://github.com/airbnb/javascript#14.1
  [2]: http://es-discourse.com/t/why-typeof-is-no-longer-safe/15

      // good
      const obj = {
        id: 5,
        name: 'San Francisco',
        [getKey('enabled')]: true,
      };

  var foo = 1,
      bar = 2
      baz = 3

   var foo = 1;
   var bar = 2;
   var baz = 3;

  function Foo() {
    var foo = this;
    foo.bar = 1;
    foo.az = 2;
  }

  var foo = new Foo();
  foo.bar = foo.bar + 5;

    {
        "preset": "airbnb"
    }

  import Foo from './Foo';
  vs 
  import Foo from './Foo.jsx';

  // bad
  var a = 1;
  var b = 2;

  // good
  const a = 1;
  const b = 2;

   3.3 Use readable synonyms in place of reserved words.

   // bad
   const superman = {
     class: 'alien',
   };

   // bad
   const superman = {
     klass: 'alien',
   };

  function Child() {
    Parent.call(this);
  }
  Child.prototype = Object.create(Parent.prototype);
  Child.prototype.constructor = Child;

    3.5 Use object method shorthand.