Function mediaCarouselChildAt

mediaCarouselChildAt(
    carousel: { children: readonly string[]; size?: number },
    index: number,
):
    | { index: number; noteMediaId: string; pk: string; size?: number }
    | undefined
The child of a carousel at index, as the like and the note address it; undefined when the carousel holds none there.
Parameters
- carousel: { children: readonly string[]; size?: number }
- index: number
Returns { index: number; noteMediaId: string; pk: string; size?: number } | undefined
- { index: number; noteMediaId: string; pk: string; size?: number }
  - Readonlyindex: number
    Zero-based child index (carousel_index).
  - ReadonlynoteMediaId: string
    <childPk>_<authorPk>, the note's carousel_media_id.
  - Readonlypk: string
    The child's own pk, the like's carousel_media_id (no author suffix).
  - Optional Readonlysize?: number
    Number of children (carousel_media_count), the like's carousel_size.
- undefined