IGPAPI
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    Variable TimelineFeedEntrySchemaConst

    TimelineFeedEntrySchema: Union<
        readonly [
            Struct<
                {
                    media_or_ad: Struct<
                        {
                            code: String;
                            media_type: Number;
                            pk: optionalKey<Union<readonly [String, Number]>>;
                            taken_at: optionalKey<Number>;
                            user: optionalKey<
                                Struct<{ pk: Union<readonly [(...), (...)]>; username: String }>,
                            >;
                        },
                    >;
                },
            >,
            Struct<
                {
                    explore_story: Struct<
                        {
                            id: Union<readonly [String, Number]>;
                            media_or_ad: Struct<
                                {
                                    code: String;
                                    media_type: Number;
                                    pk: optionalKey<Union<readonly [(...), (...)]>>;
                                    taken_at: optionalKey<Number>;
                                    user: optionalKey<Struct<{ pk: ...; username: ... }>>;
                                },
                            >;
                            source: String;
                        },
                    >;
                },
            >,
        ],
    > = ...

    One entry of feed_items, as the answer carries it.