The event name is contextmenu. So, your html template code can be something like this:
<div (contextmenu)="onRightClick($event)"></div>
$event is an optional parameter so your template and event handler can look like this:
<div (contextmenu)="onRightClick()"></div>
onRightClick() {
return false;
}
NOTE: You can return false; to avoid default browser action from the event.