import { INodePropertyOptions } from "n8n-workflow";
/**
 * Utility class to optimize loadOptions performance with smart debouncing and caching
 * This helps prevent excessive API calls during form input validation
 *
 * Vấn đề chính: Mỗi keystroke đều load all fields từ Bitrix24 API
 * Giải pháp: Smart caching + debouncing + chỉ reload khi thực sự cần thiết
 */
export declare class LoadOptionsOptimizer {
    private static cache;
    private static pendingRequests;
    private static debounceTimers;
    private static lastParams;
    private static readonly DEFAULT_TTL;
    private static readonly DEFAULT_DEBOUNCE_DELAY;
    /**
     * Get cached options if available and not expired
     */
    private static getCachedOptions;
    /**
     * Set options in cache with TTL
     */
    private static setCachedOptions;
    /**
     * Generate cache key based on method name and parameters
     */
    private static generateCacheKey;
    /**
     * Clear expired cache entries
     */
    private static cleanupExpiredCache;
    /**
     * Get last parameters for a method
     */
    private static getLastParams;
    /**
     * Set last parameters for a method
     */
    private static setLastParams;
    /**
     * Check if parameters have changed significantly
     * Đây là key để fix vấn đề keystroke - chỉ reload khi thực sự cần thiết
     */
    private static hasSignificantParamsChange;
    /**
     * Smart loadOptions method with intelligent caching and debouncing
     * @param methodName - Name of the loadOptions method
     * @param params - Parameters for the method
     * @param loadFunction - The actual loading function
     * @param options - Configuration options
     */
    static loadOptionsWithOptimization<T extends Record<string, any>>(methodName: string, params: T, loadFunction: (params: T) => Promise<INodePropertyOptions[]>, options?: {
        debounceDelay?: number;
        cacheTTL?: number;
        enableCache?: boolean;
        enableDebounce?: boolean;
        smartDebounce?: boolean;
        minParamsChange?: boolean;
    }): Promise<INodePropertyOptions[]>;
    /**
     * Execute the actual loading function with caching
     */
    private static executeLoadFunction;
    /**
     * Clear all cache and pending requests
     */
    static clearAll(): void;
    /**
     * Clear cache for specific method
     */
    static clearCacheForMethod(methodName: string): void;
    /**
     * Get cache statistics
     */
    static getCacheStats(): {
        size: number;
        pendingRequests: number;
        activeTimers: number;
        lastParams: number;
    };
}