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

    MediaCarouselSchema: Struct<
        { children: $Array<String>; size: optionalKey<Number> },
    > = ...

    A carousel media, as an answer describes it: each child's container id (<childPk>_<authorPk>) in the carousel's order, and the count when the answer names one (the media info answer and the profile grid's both do, in the answers the Simulator has met). A media whose answer holds no children is no carousel and has none of this.

    The slide the person has in front is not part of it: it is a fact of the person's view of one open post, held by the screen showing it.