Function shouldUpdateReactComponent

docs/lib/react.js:17506–17520

* Given a `prevElement` and `nextElement`, determines if the existing * instance should be updated as opposed to being destroyed or replaced by a new * instance. Both arguments are elements. This ensures that this logic can * operate on stateless trees without any backing instance. * * @param {

(prevElement, nextElement)

 */

function shouldUpdateReactComponent(prevElement, nextElement) {
  var prevEmpty = prevElement === null || prevElement === false;
  var nextEmpty = nextElement === null || nextElement === false;
  if (prevEmpty || nextEmpty) {
    return prevEmpty === nextEmpty;
  }

  var prevType = typeof prevElement;
  var nextType = typeof nextElement;
  if (prevType === 'string' || prevType === 'number') {
    return nextType === 'string' || nextType === 'number';
  } else {
    return nextType === 'object' && prevElement.type === nextElement.type && prevElement.key === nextElement.key;
  }
}

module.exports = shouldUpdateReactComponent;
},{}],139:[function(_dereq_,module,exports){