/**
 * @license
 * Copyright 2025 Vybestack LLC
 * SPDX-License-Identifier: Apache-2.0
 */
import type { CompressionContext, CompressionResult, CompressionStrategy, StrategyTrigger } from './types.js';
export declare class MiddleOutStrategy implements CompressionStrategy {
    readonly name: "middle-out";
    readonly requiresLLM = true;
    /** @plan PLAN-20260211-HIGHDENSITY.P03 @requirement REQ-HD-001.3 */
    readonly trigger: StrategyTrigger;
    compress(context: CompressionContext): Promise<CompressionResult>;
    private computeSplit;
    private resolvePrompt;
    private callProvider;
    private assembleHistory;
    private noCompressionResult;
    /**
     * @plan PLAN-20260211-HIGHDENSITY.P23
     * @requirement REQ-HD-011.3, REQ-HD-012.2
     * @pseudocode prompts-todos.md lines 251-276
     */
    private buildContextInjections;
}