NgxSpeechToText - How to use

constructor(
    private speechRecognitionService: SpeechRecognitionService
) { }

ngOnInit() {
    this.speechRecognitionService.init();
    this.speechRecognitionService.responseText$.subscribe(res => {
      // DO something
    }
    this.speechRecognitionService.start();

    ...
    ...
}

ngOnDestroy() {
  this.speechRecognitionService._destroy();
}