Download File

download.js

/**
 *
 * @param {string|Object} reqOpts Url, or `request` options
 * @param {string} destFile file path
 * @throws ExternalServiceError
 * @return {Promise}
 */
function download(reqOpts, destFile) {
  return new Promise((resolve, reject) => {
    request(reqOpts)
      .on('response', res => {
        if (res.statusCode >= 400) {
          reject(new Error(`Request to ${res.request.uri.href} returned a ${res.statusCode}`));
        }
      })
      .on('error', err => reject(new ExternalServiceError(err.message)))
      .pipe(fs.createWriteStream(destFile))
      .on('error', reject)
      .on('finish', resolve);
  })
}

download.ts

import * as request from 'request';
import * as fs from 'fs';

type IReqOpts = request.RequiredUriUrl & request.CoreOptions;

function download(reqOpts: IReqOpts, destFile:string):Promise<void> {
  return new Promise((resolve, reject) => {
    request(reqOpts)
      .on('response', res => {
        if (res.statusCode >= 400) {
          reject(new Error(`Request to ${(<any>res).request.uri.href} returned a ${res.statusCode}`));
        }
      })
      .on('error', err => reject(new Error(err.message)))
      .pipe(fs.createWriteStream(destFile))
      .on('error', reject)
      .on('finish', resolve);
  })
}

export default download;