type CacheEntry<T> = {
    key: string;
    data: T;
    timestamp: number;
    ttl: number;
};
export declare class APICache {
    private static instance;
    private dbName;
    private storeName;
    private db;
    /**
     * Private constructor to prevent direct instantiation
     */
    private constructor();
    /**
     * Get singleton instance of APICache
     */
    static getInstance(): APICache;
    /**
     * Initialize IndexedDB
     */
    init(): Promise<void>;
    /**
     * Get cached entry (if not expired)
     */
    get<T>(key: string): Promise<CacheEntry<T> | null>;
    /**
     * Set cache
     */
    set<T>(key: string, data: T, ttl: number): Promise<unknown>;
    /**
     * Delete specific cache
     */
    invalidate(key: string): Promise<unknown>;
    /**
     * Clear all cache
     */
    clear(): Promise<unknown>;
}
export declare const apiCache: APICache;
export {};
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