How to make the window go full screen in Angular 2 + / Typescript?

Follow the below code to make your angular project go fullscreen on button click.

In HTML:
<button (click)="fullscreen()"></button>
In .ts:
elem:any;
isFullscreen: any = false;
ngOnInit(): void {
this.elem = document.documentElement;
}
// code for Toggle fullscreen
fullscreen() {
if (this.isFullscreen) {
const docWithBrowsersExitFunctions = document as Document & {
mozCancelFullScreen(): Promise<void>;
webkitExitFullscreen(): Promise<void>;
msExitFullscreen(): Promise<void>;};
if (docWithBrowsersExitFunctions.exitFullscreen) {
docWithBrowsersExitFunctions.exitFullscreen();
} else if (docWithBrowsersExitFunctions.mozCancelFullScreen) { /* Firefox */
docWithBrowsersExitFunctions.mozCancelFullScreen();
} else if (docWithBrowsersExitFunctions.webkitExitFullscreen) { /* Chrome, Safari and Opera */
docWithBrowsersExitFunctions.webkitExitFullscreen();
} else if (docWithBrowsersExitFunctions.msExitFullscreen) { /* IE/Edge */
docWithBrowsersExitFunctions.msExitFullscreen();
}
this.isFullscreen = false;
}
else {
const docElmWithBrowsersFullScreenFunctions = document.documentElement as HTMLElement & {
mozRequestFullScreen(): Promise<void>;
webkitRequestFullscreen(): Promise<void>;
msRequestFullscreen(): Promise<void>;
};
if (docElmWithBrowsersFullScreenFunctions.requestFullscreen) {
docElmWithBrowsersFullScreenFunctions.requestFullscreen();
} else if (docElmWithBrowsersFullScreenFunctions.mozRequestFullScreen) { /* Firefox */
docElmWithBrowsersFullScreenFunctions.mozRequestFullScreen();
} else if (docElmWithBrowsersFullScreenFunctions.webkitRequestFullscreen) { /* Chrome, Safari and Opera */
docElmWithBrowsersFullScreenFunctions.webkitRequestFullscreen();
} else if (docElmWithBrowsersFullScreenFunctions.msRequestFullscreen) { /* IE/Edge */
docElmWithBrowsersFullScreenFunctions.msRequestFullscreen();
}
this.isFullscreen = true;
}
}