Stateless function components without React.createElement or JSX?

react-docgen is unable to find stateless function components that don't contain JSX or React.createElement call expressions.

This might be the case when some helper library is used. This will also fail if the official React.DOM helpers are used (https://github.com/reactjs/react-docgen/pull/71). Another failing case would be if only React components are returned, but React.createElement was never called because the components were wrapped in React.createFactory.

What about adding support for another heuristic, such as having a propTypes property (and to be even more specific, a propTypes property with an object containing React.PropTypes entries).

I'm happy to implement this and add tests if this sounds reasonable to the maintainers.

Empieza rastreando la detección existente de componentes funcionales sin estado en react-docgen y revisando las pruebas de componentes que usan React.createElement. Compara la heurística propTypes propuesta con los helpers de React.DOM y los casos de React.createFactory; se considera terminado cuando estos componentes se detectan sin romper el comportamiento de detección existente y las pruebas cubren los patrones compatibles.