Override Ctrl+n with Typescript

I am searching a way to override Ctrl-N with Typescript. I use Chrome-Browser.

I have tried this:

@HostListener('window:keydown', ['$event'])
onKeyDown_deleteCurrentLine(event: KeyboardEvent) {
   if (event.ctrlKey && event.key === 'n') {
       event.preventDefault();

       this.createNewLine();
   }
}

but it will still always open a new Browser-Window.

I hope, someone can help me. Thank you.