Skipping Effects with item.key in TypeScript

private executeActions(itemIds: string[], eventChange: EventChangeEntity) {
  return pipe(
    [eventChange, itemIds],
    retrieveItems, // [eventChange, Item] 
    // I want to skip invokeAction and updateItem effects if item.key is available 
    Effect.flatMap(([eventChange, items]) => {
      return pipe(
        Effect.forEachPar(items, invokeAction(eventChange)),
        Effect.flatMap(Effect.forEachPar(updateItem(eventChange))),
        Effect.map((items) => [eventChange, items] as EventItemAssociation)
      );
    })
    // ... continued
  );
}