Angular

What it does

Lifecycle hook that is called when a directive, pipe or service is destroyed.

@Component({selector: 'my-cmp', template: `...`})
class MyComponent implements OnDestroy {
  ngOnDestroy() {
    // ...
  }
}

class OnDestroy {

ngOnDestroy() : void

}

ngOnDestroy callback is typically used for any custom cleanup that needs to occur when the instance is destroyed.

ngOnDestroy() : void