/**
 * Compute the active group ID for a change.
 *
 * If inside a batch, uses the current batch frame's ID.
 * Otherwise, if mergeUngrouped is enabled and within the merge window,
 * reuses the last ungrouped ID. Otherwise generates a new group ID.
 *
 * @param root - The root object
 * @param getBatchFrames - Function to get batch frames for the root
 * @param nowProvider - Function to get current timestamp (defaults to Date.now)
 * @returns The group ID to use for the current change
 */
export declare const computeActiveGroupId: (root: object, getBatchFrames: (root: object) => {
    marker: number;
    id: string;
}[] | undefined, nowProvider?: () => number) => string;
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