/// <reference types="node" />
import type { RServerConfig } from '../@types';
import { IncomingHttpHeaders } from 'http';
import { ServerResponse } from './Response';
export declare class FileServer {
    private config;
    private rootDir;
    constructor(rootDir: string, config: RServerConfig);
    /**
     * streams a file to client
     */
    private streamFile;
    /**
     * validates range request content.
     * @see https://tools.ietf.org/html/rfc7233
     */
    private validateRangeRequest;
    /**
     * check if file is  modified
     */
    private doesClientNeedContent;
    /**
     * computes and returns a files eTag
     */
    private computeETag;
    /**
     * returns default response headers
     */
    private getFileDefaultHeaders;
    /**
     * process file
     */
    private process;
    /**
     * returns the directory's default document if any
     */
    private getDefaultDocument;
    /**
     * validates the request method and returns the public file or directory path that
     * matches the request url
     */
    private validateRequest;
    /**
     * serves a static file response back to the client
     */
    serve(requestPath: string, requestMethod: string, requestHeaders: IncomingHttpHeaders, response: ServerResponse): Promise<boolean>;
    /**
     * serves server http error files. such as 504, 404, etc
     */
    serveHttpErrorFile(errorStatusCode: number, response: ServerResponse): Promise<boolean>;
    /**
     * serves file intended for download to the client
     */
    serveDownload(filePath: string, response: ServerResponse, filename?: string): Promise<boolean>;
}