/**
 * @license
 * Copyright 2025 Vybestack LLC
 * SPDX-License-Identifier: Apache-2.0
 */
import type { IContent } from '../../services/history/IContent.js';
import type { CompressionStrategy, CompressionContext, CompressionResult, DensityResult, DensityConfig, StrategyTrigger } from './types.js';
export declare const READ_TOOLS: readonly ["read_file", "read_line_range", "read_many_files", "ast_read_file"];
export declare const WRITE_TOOLS: readonly ["write_file", "ast_edit", "replace", "insert_at_line", "delete_line_range"];
/** Shared suffix hint used in both pruned pointers and tool summaries */
export declare const RERUN_HINT_SUFFIX = "\u2014 re-run to view";
export declare const PRUNED_POINTER = "[Result pruned \u2014 re-run to view]";
export declare const FILE_INCLUSION_OPEN_REGEX: RegExp;
export declare const FILE_INCLUSION_CLOSE = "--- End of content ---";
/**
 * @plan PLAN-20260211-HIGHDENSITY.P09
 * @plan PLAN-20260211-HIGHDENSITY.P11
 * @requirement REQ-HD-004.3
 * @pseudocode high-density-optimize.md lines 20-53
 */
export declare class HighDensityStrategy implements CompressionStrategy {
    readonly name: "high-density";
    readonly requiresLLM = false;
    readonly trigger: StrategyTrigger;
    /**
     * @plan PLAN-20260211-HIGHDENSITY.P11
     * @requirement REQ-HD-005.1, REQ-HD-006.1, REQ-HD-007.1, REQ-HD-013.7
     * @pseudocode high-density-optimize.md lines 20-53
     */
    optimize(history: readonly IContent[], config: DensityConfig): DensityResult;
    /**
     * @plan PLAN-20260211-HIGHDENSITY.P14
     * @requirement REQ-HD-008.1, REQ-HD-008.2, REQ-HD-008.3, REQ-HD-008.4, REQ-HD-008.5, REQ-HD-008.6
     * @pseudocode high-density-compress.md lines 10-91
     *
     * Deterministic (no-LLM) compression:
     * 1. Calculate tail size from preserveThreshold
     * 2. Calculate target token budget
     * 3. Summarize tool responses in the head
     * 4. Truncate oldest entries if still over budget
     * 5. Return CompressionResult with metadata
     */
    compress(context: CompressionContext): Promise<CompressionResult>;
    /**
     * @plan PLAN-20260211-HIGHDENSITY.P14
     * @requirement REQ-HD-008.2
     * @pseudocode high-density-compress.md line 27
     *
     * Adjust the tail boundary backward to avoid splitting tool_call/response
     * pairs. If the boundary lands on a tool_response, move it back to include
     * the preceding AI tool_call entry as well.
     */
    private adjustTailBoundary;
    /**
     * @plan PLAN-20260211-HIGHDENSITY.P14
     * @requirement REQ-HD-008.3
     * @pseudocode high-density-compress.md lines 100-112
     *
     * Replace tool_response block results with compact one-line summaries.
     * Non-tool_response blocks are passed through unchanged.
     */
    private summarizeToolResponseBlocks;
    /**
     * @plan PLAN-20260211-HIGHDENSITY.P14
     * @requirement REQ-HD-008.3
     * @pseudocode high-density-compress.md lines 120-149
     *
     * Build a compact summary string for a tool response block.
     * Format: `[toolName keyParam: status]`
     */
    private buildToolSummaryText;
    /**
     * @plan PLAN-20260211-HIGHDENSITY.P14
     * @requirement REQ-HD-008.6
     * @pseudocode high-density-compress.md lines 155-175
     *
     * Remove oldest head entries until the estimated token count is
     * at or below the target. Never removes tail entries.
     */
    private truncateToTarget;
    /**
     * @plan PLAN-20260211-HIGHDENSITY.P14
     * @requirement REQ-HD-008.5
     * @pseudocode high-density-compress.md lines 180-193
     */
    private buildMetadata;
    /**
     * @plan PLAN-20260211-HIGHDENSITY.P11
     * @requirement REQ-HD-005.1, REQ-HD-005.2, REQ-HD-005.3, REQ-HD-005.6,
     *              REQ-HD-005.7, REQ-HD-005.8, REQ-HD-005.9
     * @pseudocode high-density-optimize.md lines 60-209
     */
    private pruneReadWritePairs;
    /**
     * @plan PLAN-20260211-HIGHDENSITY.P11
     * @requirement REQ-HD-005.9
     * @pseudocode high-density-optimize.md lines 215-255
     */
    private canPruneReadManyFiles;
    /**
     * @plan PLAN-20260211-HIGHDENSITY.P11
     * @requirement REQ-HD-006.1, REQ-HD-006.2, REQ-HD-006.3, REQ-HD-006.4, REQ-HD-006.5
     * @pseudocode high-density-optimize.md lines 280-359
     */
    private deduplicateFileInclusions;
    /**
     * @plan PLAN-20260211-HIGHDENSITY.P11
     * @requirement REQ-HD-007.1, REQ-HD-007.2, REQ-HD-007.3, REQ-HD-007.4,
     *              REQ-HD-007.6, REQ-HD-013.6
     * @pseudocode high-density-optimize.md lines 400-464
     */
    private pruneByRecency;
}