/**
 * [WHO]: Provides SimplifyController, processFilesParallel(), getContentHash()
 * [FROM]: Depends on node crypto/fs/path and simplify result types
 * [TO]: Consumed by extensions/optional/simplify/index.ts for caching and concurrency
 * [HERE]: extensions/optional/simplify/simplify-controller.ts - simplify state and parallel processing helpers
 */
import type { SimplifyResult } from "./simplify-types.js";
/**
 * Generate a short hash for content caching
 * Uses SHA-256 truncated to 16 hex characters
 */
export declare function getContentHash(content: string): string;
/**
 * Process items in parallel with a concurrency limit
 *
 * @param items - Items to process
 * @param limit - Maximum concurrent operations
 * @param processor - Async function to process each item
 * @param onProgress - Optional progress callback (completed, total)
 * @returns Array of successful results (nulls filtered out)
 */
export declare function processFilesParallel<T, R>(items: T[], limit: number, processor: (item: T) => Promise<R | null>, onProgress?: (completed: number, total: number) => void): Promise<R[]>;
/**
 * Controller for managing simplify operation state
 *
 * Responsibilities:
 * - Content hash caching (skip unchanged files)
 * - Backup management (for rollback on test failure)
 * - Applied changes tracking (for summary)
 */
export declare class SimplifyController {
    private cache;
    private backups;
    private applied;
    /**
     * Check if a file+hash combination is cached
     */
    getCached(file: string, hash: string): SimplifyResult | undefined;
    /**
     * Cache a result for a file+hash combination
     */
    setCached(file: string, hash: string, result: SimplifyResult): void;
    /**
     * Backup original file content before modification
     */
    backup(file: string, content: string): void;
    /**
     * Record an applied simplification
     */
    recordApply(result: SimplifyResult): void;
    /**
     * Rollback all applied changes by restoring backups
     */
    rollback(cwd: string): void;
    /**
     * Get summary statistics
     */
    getSummary(): {
        applied: number;
        linesSaved: number;
        rolledBack: number;
    };
    /**
     * Check if there are any backups (for rollback purposes)
     */
    hasBackups(): boolean;
    /**
     * Clear all state (for cleanup)
     */
    clear(): void;
}