React Prop Types/Defaults Single Statement

ReactPropDefinitions.js

var App = React.createClass({
  propDefinition: {
    requiredStringProp: React.PropTypes.string.isRequired.default('Hello World'),
    optionalNumberProp: React.PropTypes.number.default(12345),
    enforcedObjectNoDefaultProp: React.PropTypes.object,
    defaultValueNoTypeProp: true
  }
});