import type { RDAPResponse } from '../../shared/types';
import type { ICache } from './CacheManager';
export declare class StaleWhileRevalidateCache implements ICache {
    private readonly entries;
    private readonly maxSize;
    private readonly revalidateCallback?;
    constructor(maxSize?: number, revalidateCallback?: (key: string, freshValue: RDAPResponse) => void);
    get(key: string): Promise<RDAPResponse | null>;
    set(key: string, value: RDAPResponse, ttl?: number): Promise<void>;
    delete(key: string): Promise<void>;
    clear(): Promise<void>;
    has(key: string): Promise<boolean>;
    size(): Promise<number>;
    private evictOldest;
}
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