/**
 * Persistence layer for plan comparison results.
 *
 * Reads and writes comparison data to `.agents-reverse-engineer/plans/<id>/`.
 *
 * @module
 */
import type { PlanComparison } from './types.js';
/**
 * Save a plan comparison to disk.
 *
 * Creates the directory structure and writes:
 * - `comparison.json` - Full comparison data
 * - `plan-with-docs.md` - Raw plan text (with docs)
 * - `plan-without-docs.md` - Raw plan text (without docs)
 *
 * @param projectRoot - The project root directory
 * @param comparison - The comparison data to save
 * @param withDocsPlan - Raw plan markdown from "with docs" run
 * @param withoutDocsPlan - Raw plan markdown from "without docs" run
 */
export declare function saveComparison(projectRoot: string, comparison: PlanComparison, withDocsPlan: string, withoutDocsPlan: string): Promise<string>;
/**
 * Load a plan comparison from disk.
 *
 * @param projectRoot - The project root directory
 * @param id - The comparison ID (ISO timestamp or partial match)
 * @returns The comparison data, or null if not found
 */
export declare function loadComparison(projectRoot: string, id: string): Promise<PlanComparison | null>;
/**
 * Load plan markdown text from a saved comparison.
 *
 * @param projectRoot - The project root directory
 * @param id - The comparison ID
 * @param variant - Which plan to load
 * @returns The plan markdown text, or null if not found
 */
export declare function loadPlanText(projectRoot: string, id: string, variant: 'with-docs' | 'without-docs'): Promise<string | null>;
/**
 * List all saved plan comparisons.
 *
 * @param projectRoot - The project root directory
 * @returns Array of comparisons sorted by date (newest first)
 */
export declare function listComparisons(projectRoot: string): Promise<PlanComparison[]>;
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