export interface CacheOptions {
    ttl: number;
    capacity: number;
}
export interface CacheData<Item> {
    value: Item;
    expiry: number;
}
export declare type CacheCallbackFn<Return> = () => Return;
export declare type CacheMap<Item> = {
    [key: string]: CacheData<Item>;
};
export declare class Cache<Item = unknown> {
    static defaultOptions: CacheOptions;
    protected options: Partial<CacheOptions>;
    protected data: CacheMap<Item>;
    constructor(options?: Partial<CacheOptions>);
    get now(): number;
    get capacity(): number;
    get size(): number;
    get empty(): boolean;
    get full(): boolean;
    get percent(): number;
    get<GetItem extends Item>(key: string): GetItem;
    has(key: string): boolean;
    set(key: string, value: Item, ttl?: number): CacheData<Item>;
    prune(amount?: number): void;
    delete(key: string): void;
    clear(): void;
}