using promise with angular httpclient

promise.js

let url = `${YOUR_URL}`;

let promise = new Promise((resolve: any, reject) => {
  this._httpClient.get(url).toPromise()
  .then(
    (res: any) => {
      resolve(res);
    },
    err => {
      reject(err);
    }
  );
});
return promise;

// other way
return this._httpClient.get(url)
.map((res: any) => // do the logic )
.catch(this.handleError)
.toPromise();

private handleError(error: any): Promise<any> {
  return Promise.reject(error.message || error);
}