Function updateSlot

lib/assets/react-source/development/react.js:17358–17416

(returnFiber, oldFiber, newChild, expirationTime)

	  }

	  function updateSlot(returnFiber, oldFiber, newChild, expirationTime) {
	    // Update the fiber if the keys match, otherwise return null.
	    var key = oldFiber !== null ? oldFiber.key : null;

	    if (typeof newChild === 'string' || typeof newChild === 'number') {
	      // Text nodes don't have keys. If the previous node is implicitly keyed
	      // we can continue to replace it without aborting even if it is not a text
	      // node.
	      if (key !== null) {
	        return null;
	      }

	      return updateTextNode(returnFiber, oldFiber, '' + newChild, expirationTime);
	    }

	    if (typeof newChild === 'object' && newChild !== null) {
	      switch (newChild.$$typeof) {
	        case REACT_ELEMENT_TYPE:
	          {
	            if (newChild.key === key) {
	              if (newChild.type === REACT_FRAGMENT_TYPE) {
	                return updateFragment(returnFiber, oldFiber, newChild.props.children, expirationTime, key);
	              }

	              return updateElement(returnFiber, oldFiber, newChild, expirationTime);
	            } else {
	              return null;
	            }
	          }

	        case REACT_PORTAL_TYPE:
	          {
	            if (newChild.key === key) {
	              return updatePortal(returnFiber, oldFiber, newChild, expirationTime);
	            } else {
	              return null;
	            }
	          }
	      }

	      if (isArray$1(newChild) || getIteratorFn(newChild)) {
	        if (key !== null) {
	          return null;
	        }

	        return updateFragment(returnFiber, oldFiber, newChild, expirationTime, null);
	      }

	      throwOnInvalidObjectType(returnFiber, newChild);
	    }

	    {
	      if (typeof newChild === 'function') {
	        warnOnFunctionType();
	      }
	    }

	    return null;