Variable FeedTimelineInputSchema`Const`

FeedTimelineInputSchema: Struct<
    {
        opening: optionalKey<
            Union<readonly [Literal<"cold_start">, Literal<"tab_open">]>,
        >;
    },
> = ...

What the screen is opened with: the opening fact. The launch's declaration passes cold_start, and an absent opening means the same; an edge or a tab that reaches the feed later passes tab_open.