import { Seconds } from '@cardano-sdk/core';
import NodeCache from 'node-cache';
export declare type Key = string | number;
export declare type AsyncAction<T> = () => Promise<T>;
export declare class InMemoryCache {
    protected cache: NodeCache;
    protected ttlDefault: number;
    constructor(ttl: Seconds | 0, cache?: NodeCache);
    get<T>(key: Key, asyncAction: AsyncAction<T>, ttl?: number): Promise<T>;
    getVal<T>(key: Key): T | undefined;
    set<T>(key: Key, value: T, ttl?: number): boolean;
    invalidate(keys: Key | Key[]): void;
    keys(): string[];
    shutdown(): void;
    clear(): void;
}
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