IGPAPI
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    Variable ProfileInputSchemaConst

    ProfileInputSchema: Union<
        readonly [
            Struct<
                {
                    reachedFrom: optionalKey<
                        Union<
                            readonly [
                                Struct<{ kind: Literal<"search"> }>,
                                Struct<
                                    {
                                        followRankingToken: optionalKey<String>;
                                        kind: Literal<"suggested_users">;
                                    },
                                >,
                                Struct<{ kind: Literal<"deep_link"> }>,
                            ],
                        >,
                    >;
                    userId: String;
                },
            >,
            Struct<{ username: String }>,
        ],
    > = ...

    What a profile is opened with: a user id — from a list item, or from outside the app, in which case reachedFrom is absent — or a username, which the enter resolves with the by-username info stream.