/// <reference types="node" />
import { Stream } from 'stream';
import { Options } from 'content-disposition';
import { ResultValue } from './ResultValue';
import { IContext } from '../IContext';
export interface FileResultOption {
    /**
     * content type
     */
    contentType?: string;
    /**
     * file name for download.
     */
    filename?: string;
    /**
     * content disposition.
     */
    disposition: Options;
}
/**
 * controller method return result type of file.
 *
 * @export
 * @class FileResult
 */
export declare class FileResult extends ResultValue {
    private file;
    private options?;
    constructor(file: string | Buffer | Stream, options?: FileResultOption);
    sendValue(ctx: IContext): Promise<void>;
    static ρAnn(): any;
}