import * as Express from "express";
export declare function trap<T>(res: Express.Response, x: () => Promise<T>): Promise<T | undefined>;
export declare function open_directory(path: string): void;
export declare function launch_code_editor(path: string): void;
export declare type Deferred<T> = {
    resolve: (value: T) => void;
    reject: (reason: any) => void;
    promise: Promise<T>;
};
export declare function defer<T>(): Deferred<T>;