Unirest as Promise (Typescript)

UnirestAsPromise.ts

import Bluebird = require('bluebird');
import {UnirestError} from './UnirestError';

/**
 * A tool for converting a unirest object into a promise
 * @param unirest The unirest instance
 * @returns {Bluebird<any>}
 */
export function unirestAsPromise(unirest: any): Bluebird<any> {
    return new Bluebird(
        (resolve, reject) => {
            unirest.end(
                (response) => {
                    if (response.ok) {
                        resolve(response);
                    } else {
                        reject(new UnirestError(response));
                    }
                }
            );
        }
    );
}

UnirestError.ts

/**
 * Error communicating
 */

export class UnirestError extends Error {
    constructor(response: any) {
        super(
            `Error ${response.code} received: ${response.rawBody}`
        );
    }
}