Function updateSlot

docs/external/js/react-dom.development.js:13798–13856

(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;