Angular HttpClient: Observable with data continous data stream using interval requests to API endpoint

The following example requests /api/data every second, creating an Observable where you can subscribe to the continous value stream.

import { HttpClient } from '@angular/common/http';
import { Injectable } from '@angular/core';
import { interval, mergeMap, Observable } from 'rxjs';

@Injectable({
  providedIn: 'root'
})
export class DataService {

  constructor(private http: HttpClient) { }

  continousDataStream(_interval=1000): Observable<any> {
    return interval(_interval).pipe(mergeMap(_ => {
        return this.http.get<any>(`/api/data`);
    }));
  }
}