import { Observable } from 'rxjs';
import * as i0 from "@angular/core";
/**
 * Cache service for geocoding responses
 */
export declare class OpenCageCacheService {
    private cache;
    private accessOrder;
    private maxSize;
    private accessCounter;
    /**
     * Get item from cache
     */
    get<T>(key: string): T | null;
    /**
     * Set item in cache
     */
    set<T>(key: string, data: T, ttl: number): void;
    /**
     * Delete item from cache
     */
    delete(key: string): boolean;
    /**
     * Clear all cache entries
     */
    clear(): void;
    /**
     * Check if key exists in cache (and is not expired)
     */
    has(key: string): boolean;
    /**
     * Get cache statistics
     */
    getStats(): {
        size: number;
        maxSize: number;
        hitRate: number;
        memoryUsage: number;
    };
    /**
     * Clean expired entries
     */
    cleanup(): number;
    /**
     * Set maximum cache size
     */
    setMaxSize(size: number): void;
    /**
     * Get or set with observable support
     */
    getOrSet<T>(key: string, factory: () => Observable<T>, ttl: number): Observable<T>;
    /**
     * Create cache key for geocoding requests
     */
    createKey(query: string, options?: any): string;
    /**
     * Create cache key for reverse geocoding requests
     */
    createReverseKey(lat: number, lng: number, options?: any): string;
    /**
     * Evict least recently used entry
     */
    private evictLRU;
    /**
     * Calculate cache hit rate (simplified)
     */
    private calculateHitRate;
    /**
     * Estimate memory usage (simplified)
     */
    private estimateMemoryUsage;
    /**
     * Sort object keys for consistent cache keys
     */
    private sortObject;
    /**
     * Periodic cleanup task
     */
    startPeriodicCleanup(intervalMs?: number): void;
    static ɵfac: i0.ɵɵFactoryDeclaration<OpenCageCacheService, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<OpenCageCacheService>;
}