/**
 * @license
 * Copyright 2025 Vybestack LLC
 * SPDX-License-Identifier: Apache-2.0
 */
import type { CompressionContext, CompressionResult, CompressionStrategy, StrategyTrigger } from './types.js';
export declare class TopDownTruncationStrategy implements CompressionStrategy {
    readonly name: "top-down-truncation";
    readonly requiresLLM = false;
    /** @plan PLAN-20260211-HIGHDENSITY.P03 @requirement REQ-HD-001.3 */
    readonly trigger: StrategyTrigger;
    compress(context: CompressionContext): Promise<CompressionResult>;
}