Function reelsViewerChainingOf

reelsViewerChainingOf(
    input:
        | {
            chaining?: {
                chainingSessionId?: string;
                mediaPctWatched?: string
                | number;
                rankingSessionId?: string;
            };
            index: number;
            reels: readonly {
                code: string;
                id: string;
                media_type: number;
                organic_tracking_token?: string;
                pk: string;
                taken_at?: number;
                user?: { id?: string; pk?: string };
                video_duration?: number;
            }[];
        }
        | {
            chainingPosition?: string
            | number;
            chainingSeedMediaId?: string;
            chainingSessionId?: string;
            clientPosition?: string | number;
            friendsLane?: false;
            media?: {
                code: string;
                id: string;
                media_type: number;
                organic_tracking_token?: string;
                pk: string;
                taken_at?: number;
                user?: { id?: string; pk?: string };
                video_duration?: number;
            };
            mediaPctWatched?: string
            | number;
            rankingSessionId?: string;
            storyRankingToken?: string;
        },
): {
    chainingPosition?: string
    | number;
    chainingSeedMediaId?: string;
    chainingSessionId?: string;
    clientPosition?: string | number;
    mediaPctWatched?: string | number;
    rankingSessionId?: string;
    storyRankingToken?: string;
}
Internal
The viewer's resolved chaining session, from the input it opened with: the declared values plus what the viewer itself derives.

The two session ids are the app's own: the input keeps the ones its caller declares, and the ones it lacks the viewer mints once, when it opens (its enter, the effectful owner of the moment, like the sheet's composer session id) — never here, because a restore re-runs this function and would mint a second session. The minted session lives in the viewer's process state (ReelsViewerViews), which the checkpoint carries, so a restored viewer's like and comment name the session it opened with; the ids are never null where the app sends one (android-451/reels-comment 123 and reels-like 125 carry a uuid). The single-reel entry keeps every other declared value as it comes — the 450 app declares the whole session there. The list entry's seed is the tapped reel's container id (the comment's form; the like names its pk) and its positions are the reel's index in the list, derived by the reel that acts, not declared by the caller.
Parameters
- input:
      | {
          chaining?: {
              chainingSessionId?: string;
              mediaPctWatched?: string
              | number;
              rankingSessionId?: string;
          };
          index: number;
          reels: readonly {
              code: string;
              id: string;
              media_type: number;
              organic_tracking_token?: string;
              pk: string;
              taken_at?: number;
              user?: { id?: string; pk?: string };
              video_duration?: number;
          }[];
      }
      | {
          chainingPosition?: string
          | number;
          chainingSeedMediaId?: string;
          chainingSessionId?: string;
          clientPosition?: string | number;
          friendsLane?: false;
          media?: {
              code: string;
              id: string;
              media_type: number;
              organic_tracking_token?: string;
              pk: string;
              taken_at?: number;
              user?: { id?: string; pk?: string };
              video_duration?: number;
          };
          mediaPctWatched?: string
          | number;
          rankingSessionId?: string;
          storyRankingToken?: string;
      }
  - {
        chaining?: {
            chainingSessionId?: string;
            mediaPctWatched?: string | number;
            rankingSessionId?: string;
        };
        index: number;
        reels: readonly {
            code: string;
            id: string;
            media_type: number;
            organic_tracking_token?: string;
            pk: string;
            taken_at?: number;
            user?: { id?: string; pk?: string };
            video_duration?: number;
        }[];
    }
  - {
        chainingPosition?: string | number;
        chainingSeedMediaId?: string;
        chainingSessionId?: string;
        clientPosition?: string | number;
        friendsLane?: false;
        media?: {
            code: string;
            id: string;
            media_type: number;
            organic_tracking_token?: string;
            pk: string;
            taken_at?: number;
            user?: { id?: string; pk?: string };
            video_duration?: number;
        };
        mediaPctWatched?: string
        | number;
        rankingSessionId?: string;
        storyRankingToken?: string;
    }
    Optional ReadonlychainingPosition?: string | number
    Zero-based position in the chaining session.
    
    Optional ReadonlychainingSeedMediaId?: string
    Seed media id of the chaining session (chaining_seed_media_id), in the form the caller holds it.
    
    Optional ReadonlychainingSessionId?: string
    Opaque chaining-session id.
    
    Optional ReadonlyclientPosition?: string | number
    Client position in the viewer.
    
    Optional ReadonlyfriendsLane?: false
    The tab entry's friends-lane prefetch (clips/discover/social/) is the bottom bar tap's; the landing after a published reel opens the same tab without it (run-reel-plain-20261026-2056), so it declares false. Absent: the entry sends it.
    
    Optional Readonlymedia?: {
        code: string;
        id: string;
        media_type: number;
        organic_tracking_token?: string;
        pk: string;
        taken_at?: number;
        user?: { id?: string; pk?: string };
        video_duration?: number;
    }
    Readonlycode: string
    The media's shortcode, the item's identity key.
    
    Readonlyid: string
    Container media id (<pk>_<authorPk>).
    
    Readonlymedia_type: number
    Optional Readonlyorganic_tracking_token?: string
    Readonlypk: string
    The media's numeric pk.
    
    Optional Readonlytaken_at?: number
    Optional Readonlyuser?: { id?: string; pk?: string }
    Optional Readonlyvideo_duration?: number
    The clip's length in seconds, when the answer carries it.
    
    Optional ReadonlymediaPctWatched?: string | number
    Percentage of the clip watched before the like (0–100), the app's measurement.
    
    Optional ReadonlyrankingSessionId?: string
    Ranking session id.
    
    Optional ReadonlystoryRankingToken?: string
    The reel's story ranking token.
Returns {
    chainingPosition?: string | number;
    chainingSeedMediaId?: string;
    chainingSessionId?: string;
    clientPosition?: string | number;
    mediaPctWatched?: string | number;
    rankingSessionId?: string;
    storyRankingToken?: string;
}
- Optional ReadonlychainingPosition?: string | number
  Zero-based position in the chaining session.
- Optional ReadonlychainingSeedMediaId?: string
  Seed media id of the chaining session (chaining_seed_media_id), in the form the caller holds it.
- Optional ReadonlychainingSessionId?: string
  Opaque chaining-session id.
- Optional ReadonlyclientPosition?: string | number
  Client position in the viewer.
- Optional ReadonlymediaPctWatched?: string | number
  Percentage of the clip watched before the like (0–100), the app's measurement.
- Optional ReadonlyrankingSessionId?: string
  Ranking session id.
- Optional ReadonlystoryRankingToken?: string
  The reel's story ranking token.

Function reelsViewerChainingOf

Parameters

`Optional` `Readonly`chainingPosition?: string | number

`Optional` `Readonly`chainingSeedMediaId?: string

`Optional` `Readonly`chainingSessionId?: string

`Optional` `Readonly`clientPosition?: string | number

`Optional` `Readonly`friendsLane?: false

`Optional` `Readonly`media?: {
    code: string;
    id: string;
    media_type: number;
    organic_tracking_token?: string;
    pk: string;
    taken_at?: number;
    user?: { id?: string; pk?: string };
    video_duration?: number;
}

`Readonly`code: string

`Readonly`id: string

`Readonly`media_type: number

`Optional` `Readonly`organic_tracking_token?: string

`Readonly`pk: string

`Optional` `Readonly`taken_at?: number

`Optional` `Readonly`user?: { id?: string; pk?: string }

`Optional` `Readonly`video_duration?: number

`Optional` `Readonly`mediaPctWatched?: string | number

`Optional` `Readonly`rankingSessionId?: string

`Optional` `Readonly`storyRankingToken?: string

Returns {
    chainingPosition?: string | number;
    chainingSeedMediaId?: string;
    chainingSessionId?: string;
    clientPosition?: string | number;
    mediaPctWatched?: string | number;
    rankingSessionId?: string;
    storyRankingToken?: string;
}

`Optional` `Readonly`chainingPosition?: string | number

`Optional` `Readonly`chainingSeedMediaId?: string

`Optional` `Readonly`chainingSessionId?: string

`Optional` `Readonly`clientPosition?: string | number

`Optional` `Readonly`mediaPctWatched?: string | number

`Optional` `Readonly`rankingSessionId?: string

`Optional` `Readonly`storyRankingToken?: string

Settings

Function reelsViewerChainingOf

Parameters

Optional ReadonlychainingPosition?: string | number

Optional ReadonlychainingSeedMediaId?: string

Optional ReadonlychainingSessionId?: string

Optional ReadonlyclientPosition?: string | number

Optional ReadonlyfriendsLane?: false

Optional Readonlymedia?: { code: string; id: string; media_type: number; organic_tracking_token?: string; pk: string; taken_at?: number; user?: { id?: string; pk?: string }; video_duration?: number;}

Readonlycode: string

Readonlyid: string

Readonlymedia_type: number

Optional Readonlyorganic_tracking_token?: string

Readonlypk: string

Optional Readonlytaken_at?: number

Optional Readonlyuser?: { id?: string; pk?: string }

Optional Readonlyvideo_duration?: number

Optional ReadonlymediaPctWatched?: string | number

Optional ReadonlyrankingSessionId?: string

Optional ReadonlystoryRankingToken?: string

Returns { chainingPosition?: string | number; chainingSeedMediaId?: string; chainingSessionId?: string; clientPosition?: string | number; mediaPctWatched?: string | number; rankingSessionId?: string; storyRankingToken?: string;}

Optional ReadonlychainingPosition?: string | number

Optional ReadonlychainingSeedMediaId?: string

Optional ReadonlychainingSessionId?: string

Optional ReadonlyclientPosition?: string | number

Optional ReadonlymediaPctWatched?: string | number

Optional ReadonlyrankingSessionId?: string

Optional ReadonlystoryRankingToken?: string

Settings

`Optional` `Readonly`chainingPosition?: string | number

`Optional` `Readonly`chainingSeedMediaId?: string

`Optional` `Readonly`chainingSessionId?: string

`Optional` `Readonly`clientPosition?: string | number

`Optional` `Readonly`friendsLane?: false

`Optional` `Readonly`media?: {
code: string;
id: string;
media_type: number;
organic_tracking_token?: string;
pk: string;
taken_at?: number;
user?: { id?: string; pk?: string };
video_duration?: number;
}

`Readonly`code: string

`Readonly`id: string

`Readonly`media_type: number

`Optional` `Readonly`organic_tracking_token?: string

`Readonly`pk: string

`Optional` `Readonly`taken_at?: number

`Optional` `Readonly`user?: { id?: string; pk?: string }

`Optional` `Readonly`video_duration?: number

`Optional` `Readonly`mediaPctWatched?: string | number

`Optional` `Readonly`rankingSessionId?: string

`Optional` `Readonly`storyRankingToken?: string

Returns {
chainingPosition?: string | number;
chainingSeedMediaId?: string;
chainingSessionId?: string;
clientPosition?: string | number;
mediaPctWatched?: string | number;
rankingSessionId?: string;
storyRankingToken?: string;
}

`Optional` `Readonly`chainingPosition?: string | number

`Optional` `Readonly`chainingSeedMediaId?: string

`Optional` `Readonly`chainingSessionId?: string

`Optional` `Readonly`clientPosition?: string | number

`Optional` `Readonly`mediaPctWatched?: string | number

`Optional` `Readonly`rankingSessionId?: string

`Optional` `Readonly`storyRankingToken?: string