hotkeys shortcut keyboard key board combination angular javascript

ex.ts

// VERSION LIGTH VANILLA JAVASCRIPT FUENTE: https://www.npmjs.com/package/hotkeys-js
// teclas posibles Supported Keys
//HotKeys understands the following modifiers: ⇧, shift, option, ⌥, alt, ctrl, control, command, and ⌘.

//The following special keys can be used for shortcuts: backspace, tab, clear, enter, return, esc, escape, space, up, down, left, right, home, end, pageup, pagedown, del, delete and f1 through f19.
<script src="https://unpkg.com/hotkeys-js/dist/hotkeys.min.js"></script>
<script type="text/javascript">
hotkeys('ctrl+a,ctrl+b,r,f', function(event,handler) {
  switch(handler.key){
    case "ctrl+a":alert('you pressed ctrl+a!');break;
    case "ctrl+b":alert('you pressed ctrl+b!');break;
    case "r":alert('you pressed r!');break;
    case "f":alert('you pressed f!');break;
  }
});
</script> 

version angular

// fuente: https://www.npmjs.com/package/keypress-combination

//npm install keypress-combination

import * as KeypressCombinationEmitter from "keypress-combination";
//definir variable dentro de la clase
emitter = new KeypressCombinationEmitter();

//funcion dentro de la clase.. en este caso escucha la combinacion CTRL + ALT + F1
subscription = this.emitter.addListener(18, 17, 112, () => {
    // CTRL Keycode: 17
    // alt: 18
    // F1: 112
    console.log("Pressed ");
  });