import type { Checkpoint } from "../types.js";
/**
 * Append a detached checkpoint and retain only the newest bounded history.
 * Retention is strictly append-ordered and never inspects durable timestamps.
 */
export declare function appendRetainedCheckpoint(checkpoints: Checkpoint[], checkpoint: Checkpoint): void;
/**
 * Return history after deleting one oldest occurrence for each requested ID.
 * Checkpoint IDs are not unique, so Set-based filtering would also delete
 * newer occurrences that cleanup intends to retain.
 */
export declare function deleteOldestCheckpointOccurrences(checkpoints: readonly Checkpoint[], checkpointIds: readonly string[]): Checkpoint[];
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