import { ProxyDataAdapter, ResolvedHost, ResolveHostOptions } from "../adapter";
export interface HostResolverCache {
    resolveHost(host: string, options?: ResolveHostOptions): Promise<ResolvedHost | null>;
}
export interface HostCacheOptions {
    freshTtlMs: number;
    staleTtlMs?: number;
    staleIfErrorTtlMs?: number;
    negativeTtlMs?: number;
    maxEntries?: number;
    waitUntil?: (promise: Promise<unknown>) => void;
    upstreamTimeoutMs?: number;
}
export declare function createInMemoryHostCache(data: ProxyDataAdapter, ttlMs: number, maxEntries?: number): HostResolverCache;
export declare function createInMemoryHostCache(data: ProxyDataAdapter, options: HostCacheOptions): HostResolverCache;