import { ICache } from '@citrineos/base';
import { ClassConstructor } from 'class-transformer';
/**
 * Implementation of cache interface with memory storage
 */
export declare class MemoryCache implements ICache {
    private _cache;
    private _keySubscriptionMap;
    private _keySubscriptionPromiseMap;
    private _timeoutMap;
    constructor();
    exists(key: string, namespace?: string): Promise<boolean>;
    remove(key: string, namespace?: string): Promise<boolean>;
    onChange<T>(key: string, waitSeconds: number, namespace?: string, classConstructor?: () => ClassConstructor<T>): Promise<T | null>;
    get<T>(key: string, namespace?: string, classConstructor?: () => ClassConstructor<T>): Promise<T | null>;
    set(key: string, value: string, namespace?: string, expireSeconds?: number): Promise<boolean>;
    setIfNotExist(key: string, value: string, namespace?: string, expireSeconds?: number): Promise<boolean>;
    private resolveOnChange;
}