/**
 * The memory cache utilities.
 */
export declare class MemoryCache {
    private readonly caches;
    private readonly cacheSize;
    constructor(cacheSize?: number);
    set<T>(key: string, val: T): void;
    get<T>(key: string): T | undefined;
    get<T>(key: string, getDefault?: () => Promise<T> | T): Promise<T>;
    delete(key: string): void;
    clear(): void;
    private first;
    private getContextCache;
}