This DEV-only field was added in 836331ba5f69f2cc53b273ec073fae116db14302 by @sebmarkbage but it's not being used anymore to my knowledge.
if (enableProfilerTimer) {
    fiber.stateNode = {
      effectDuration: 0,
      passiveEffectDuration: 0,
    };
  }
  return fiber;
}
export function createFiberFromSuspense(
  pendingProps: any,
  mode: TypeOfMode,
  lanes: Lanes,
  key: null | string,
) {
  const fiber = createFiber(SuspenseComponent, pendingProps, key, mode);
  fiber.elementType = REACT_SUSPENSE_TYPE;
  fiber.lanes = lanes;
  return fiber;
}
export function createFiberFromSuspenseList(
  pendingProps: any,
  mode: TypeOfMode,
  lanes: Lanes,
  key: null | string,
) {
  const fiber = createFiber(SuspenseListComponent, pendingProps, key, mode);
  fiber.elementType = REACT_SUSPENSE_LIST_TYPE;
  fiber.lanes = lanes;
  return fiber;
}