/// <reference types="node" />
import { ReadStream } from 'fs';
import { Response } from 'express';
export declare type Downloadable = string | ReadStream | Buffer | object | Array<any>;
export declare class Download<DownloadType> {
    readonly download: DownloadType;
    readonly mimeType?: string;
    readonly fileName: string;
    static from(download: Downloadable, mimeType?: string, fileName?: string): StreamDownload | PathDownload | BufferDownload;
    constructor(download: DownloadType, mimeType?: string, fileName?: string);
    getFileName(): string;
}
export declare class StreamDownload extends Download<ReadStream> {
    handle(res: Response): void;
}
export declare class BufferDownload extends Download<Buffer> {
    handle(res: Response): void;
}
export declare class PathDownload extends Download<string> {
    handle(res: Response): void;
    getFileName(): string;
}