export type TrackedChangeThreadSource<Id> = {
    trackedChangeThreadParentId?: Id | null;
    trackedChangeParentId?: Id | null;
    trackedChangeLink?: unknown;
    trackedChangeType?: unknown;
    trackedChangeDisplayType?: unknown;
    trackedChangeText?: unknown;
    deletedText?: unknown;
    trackedChange?: unknown;
};
/**
 * Resolve explicit thread provenance first, then the guarded legacy fallback.
 * Spatial-only v2 comments carry neither the explicit field nor a legacy
 * review signal and therefore remain standalone.
 */
export declare const trackedChangeThreadParentIdForComment: <Id>(comment: TrackedChangeThreadSource<Id> | null | undefined) => Id | null;