/// <reference types="@types/node" />
import { Writable } from "stream";
import { ICacheItem, IStreamCacheBackend } from "./Cache";
export interface IStringDecoder<K> {
    asString(key: K): string;
    asKey(str: string): K;
}
export declare class FileStreamCacheBackend<K> implements IStreamCacheBackend<K> {
    private rootPath;
    private decoder;
    constructor(rootPath: string, decoder?: IStringDecoder<K>);
    putStreaming(key: K): Promise<Writable>;
    getSteaming(key: K, output: Writable): Promise<boolean>;
    expunge(key: K): Promise<boolean>;
    [Symbol.iterator](): Iterator<ICacheItem<K>>;
    private getPath;
}