interface
A lifecycle hook that is called after the default change detector has completed checking all content of a directive. It will run after the content has been checked and most of the time it's during a change detection cycle.
interface AfterContentChecked {
  ngAfterContentChecked(): void
}   |    ngAfterContentChecked()     | 
|---|
|   A callback method that is invoked immediately after the default change detector has completed checking all of the directive's content.  |  
   |  
The following snippet shows how a component can implement this interface to define its own after-check functionality.
@Component({selector: 'my-cmp', template: `...`})
class MyComponent implements AfterContentChecked {
  ngAfterContentChecked() {
    // ...
  }
} 
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Licensed under the Creative Commons Attribution License 4.0.
    https://angular.io/api/core/AfterContentChecked