/// <reference types="node" />
import * as fs from 'fs';
export declare class CachingFileReader {
    private readonly fileMap;
    constructor(ttl?: number);
    /**
     * reads the entire contents of a file and cache it, speed up in next time of reading.
     * @param path A path to a file. If a URL is provided, it must use the `file:` protocol.
     * @param options used to specified encoding
     */
    readFile(path: fs.PathLike, options?: {
        encoding?: string | null;
    } | string): Promise<string | Buffer>;
    private monitorChange;
}