Angular2: Web Speech API - Voice Recognition
Answer : Finally I solved creating an interface !! export interface IWindow extends Window { webkitSpeechRecognition: any; } And: const {webkitSpeechRecognition} : IWindow = <IWindow>window; const recognition = new webkitSpeechRecognition(); In Angular 9, it worked me but using const speechRecognition = window['webkitSpeechRecognition']; note that the window 'w' is lowercase.