Sanity Library Reference Docs
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    GroupMember:
        | {
            activity?: string;
            kind: "field";
            name: string;
            scope: FieldScope;
            stage?: string;
        }
        | { kind: "activity"; name: string; stage: string }
        | { activity: string; kind: "action"; name: string; stage: string }

    A group member's address — enough to locate the node without the definition.