HTTP Request with Promises in Typescript

ajax-with-promise.ts

getRequest(url: string): Promise<any> {
  return new Promise<any>(
    function (resolve, reject) {
      const request = new XMLHttpRequest();
      request.onload = function () {
        if (this.status === 200) {
          resolve(this.response);
        } else {
          reject(new Error(this.statusText));
        }
      };
      request.onerror = function () {
        reject(new Error('XMLHttpRequest Error: ' + this.statusText));
      };
      request.open('GET', url);
      request.send();
    });

getRequest('http://some.url')
  .then(response => {
    console.log(response);
  })
  .catch(error => {
    console.log(error);
  });