Function update

update(
    req: Request<
        { id: string },
        unknown,
        {
            category?: Book | Electronics | Misc;
            name?: string;
            price?: number;
            stock?: number;
            user?: number;
        },
    >,
    res: Response<
        {
            category: ItemCategory;
            id: number;
            name: string;
            price: number;
            stock: number;
            user?: | number
            | { email?: string; id: number; name?: string; username: string };
        },
    >,
): Promise<void>
PATCH /api/items/id/:id
Parameters
- req: Request<
      { id: string },
      unknown,
      {
          category?: Book | Electronics | Misc;
          name?: string;
          price?: number;
          stock?: number;
          user?: number;
      },
  >
- res: Response<
      {
          category: ItemCategory;
          id: number;
          name: string;
          price: number;
          stock: number;
          user?: | number
          | { email?: string; id: number; name?: string; username: string };
      },
  >
Returns Promise<void>
- Defined in backend/src/controllers/items.ts:59