import { Readable } from "node:stream";
export declare function exists(path: string): {
    size: number;
} | false;
export declare class FileCache {
    #private;
    constructor(cacheFolder: string);
    hasFile(cachePath: string): false | {
        size: number;
        contentType: string;
    };
    streamFromCache(cachePath: string, headers: Headers): Response;
    streamToCache(cachePath: string, readable: Readable, info: {
        size: number;
        contentType: string;
    }): Promise<void>;
}