Sanity Library Reference Docs
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    InstanceChangeEvent:
        | { id: string; transition: "appear"
        | "update"
        | "disappear" }
        | { transition: "reset" }

    One event off the engine dataset's shared instance-change feed: Sanity's listener transitions verbatim (a document newly matching the feed appears, a matching one updates, a deleted one disappears), plus the adapter's own reset arm — the feed reconnected after a failure, events may have been missed, and a consumer must resynchronize rather than trust held rows.