import { ICache } from "./types";
export type WaterfallCacheOptions = {
    providers: ICache[];
};
export declare class WaterfallCache<V = any> implements ICache<V> {
    readonly providers: ICache[];
    constructor(options: WaterfallCache);
    keys(): IterableIterator<string>;
    has(key: string): boolean;
    get<T extends V = V>(key: string): T | undefined;
    set<T extends V = V>(key: string, value: T): void;
    delete(key: string): void;
    clear(): void;
}