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

    ScreenViaSchema: Struct<
        {
            skipOrdinals: optionalKey<Int>;
            source: Literals<
                readonly [
                    "cold_start",
                    "warm_start",
                    "button",
                    "tab",
                    "search_result",
                    "inbox",
                    "inbox_new_message",
                    "suggested_users",
                    "third_party_url",
                    "message_button",
                    "clips_profile",
                    "camera_tab_bar",
                    "next",
                ],
            >;
        },
    > = ...

    How a screen is reached, as a checkpoint and a trail store it: the navigation source and the session ordinals consumed before the screen's own. One declaration for both stored forms, so a drift in one copy cannot go unnoticed.