import type { RetainedOperation, TruncationEntry } from "../schema";
/**
 * Keeps bucket winners and only the ancestors needed by those winners.
 * Descendants must be added before their ancestors, matching span completion order.
 */
export declare class OperationStore {
    private readonly _buckets;
    private readonly _retained;
    private readonly _winnerIds;
    private readonly _pinnedIds;
    private readonly _requiredByChildren;
    add(operation: RetainedOperation): void;
    snapshot(): {
        operations: RetainedOperation[];
        truncation: TruncationEntry[];
    };
    private _retain;
    private _releaseIfUnused;
    private _incrementRequirement;
    private _decrementRequirement;
    private _isRequired;
}