import { MongoClient } from "mongodb";
import { CacheEntry, CacheSettings } from "./index";
import { CacheRefreshStrategy } from "../../types";
export declare class MongoCache {
    private client;
    private db;
    private collection;
    private readonly memoryCacheClient;
    private readonly connectionUrl;
    private readonly databaseName;
    private readonly collectionName;
    private readonly staleTTL;
    private readonly expiresTTL;
    readonly allowStale: boolean;
    readonly cacheRefreshStrategy: CacheRefreshStrategy;
    constructor({ staleTTL, //         1 minute
    expiresTTL, //  10 minutes
    allowStale, cacheRefreshStrategy, connectionUrl, databaseName, collectionName, useAdditionalMemoryCache, }?: CacheSettings);
    connect(): Promise<void>;
    get(key: string): Promise<CacheEntry | undefined>;
    set(key: string, payload: unknown): Promise<void>;
    getClient(): MongoClient | undefined;
    getStatus(): Promise<"up" | "down">;
}