igpapi — Instagram private API Simulator for Node.js (API reference) 4.14.0
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    Variable FeedTimelineUnknownItemConst

    FeedTimelineUnknownItem: ScreenItemDefinition<
        "FeedTimelineUnknown",
        {
            item: { kind: "unknown"; kindKey?: string; raw: Json };
            key: string;
            position: number;
            type: "unknown";
        },
        {
            item: { kind: "unknown"; kindKey?: string; raw: Json };
            key: string;
            position: number;
            type: "unknown";
        },
        Record<never, never>,
        never,
        never,
        FeedTimelineUnknownItemActions,
        undefined,
        never,
        never,
    > = ...

    An entry of a kind the library does not model, as the page lists it: the entry's item carries the kind's key and the raw entry, so a caller can see it, and nothing is sent. The server's list is an open union ("Screens are the product surface"), so an unmodelled kind is this item and never a failed feed.