/// <reference types="node" />
import { Readable } from "stream";
import { RequestContext } from "./base/context";
import { ExpressHandler } from "./base/handler";
import { ResponseInterface } from "./base/response-wrapper";
export declare type AvailableResponseType = string | Buffer | Readable;
export declare class DownloadHandler<ReqType> extends ExpressHandler<ReqType, AvailableResponseType, DownloadRequestContext<ReqType>> {
    protected mimeType: string;
    protected instanceContext(req: any, res: any): DownloadRequestContext<ReqType>;
    setMimeType(mime: string): void;
}
export declare class DownloadRequestContext<ReqType> extends RequestContext<ReqType, AvailableResponseType> {
    protected createResponseWrapper(): DownloadWrapper;
}
export declare class DownloadWrapper extends ResponseInterface<AvailableResponseType> {
    protected responseContent: AvailableResponseType;
    protected asyncResolve(ret: AvailableResponseType): void;
    protected _send(): void;
}