Detect click outside an Angular component

clicked-out.ts

@Component({ ... })
export class Mva10SelectFieldComponent {
	constructor( private elementRef: ElementRef ) { }

	onClickOut(targetElement?: HTMLElement): void {
		if (!targetElement) { return; }

		const clickedInside = this.elementRef.nativeElement.contains(targetElement);
		if (!clickedInside) {
			// Clicked outside component!
		}
	}
}