This DEV-only field was added in 836331ba5f69f2cc53b273ec073fae116db14302 by @sebmarkbage but it's not being used anymore to my knowledge.
' You likely forgot to export your component from the file ' +
              "it's defined in, or you might have mixed up default and " +
              'named imports.';
          }
          const ownerName = owner ? getComponentNameFromFiber(owner) : null;
          if (ownerName) {
            info += '\n\nCheck the render method of `' + ownerName + '`.';
          }
        }
        invariant(
          false,
          'Element type is invalid: expected a string (for built-in ' +
            'components) or a class/function (for composite components) ' +
            'but got: %s.%s',
          type == null ? type : typeof type,
          info,
        );
      }
    }
  }
  const fiber = createFiber(fiberTag, pendingProps, key, mode);
  fiber.elementType = type;
  fiber.type = resolvedType;
  fiber.lanes = lanes;
  if (__DEV__) {
    fiber._debugOwner = owner;
  }
  return fiber;
}
export function createFiberFromElement(