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

    ProfilePostsFeedFactsSchema: Struct<
        { firstMediaId: String; followsAuthor: optionalKey<Boolean> },
    > = ...

    The facts the feed carries beside its cursor, so its items read them as their host's state instead of each entry copying them: the clip the feed was entered from (the like's starting_clips_media_id, see ProfilePostsFeedMediaState.startingClipsMediaId) and whether the viewer follows the profile (absent when the friendship answer named none).