fix: does not throw an error if KeyboardEvent has no key

Author: ThibaudAV

projects/ngx-raptorize/src/lib/konamiCode.directive.spec.ts

@@ -36,6 +36,10 @@ describe('KonamiCodeDirective', () => {
     fixture.detectChanges();
   });
 
+  it('should do nothing if the event has no key', () => {
+    document.dispatchEvent(new Event('keydown'));
+  });
+
   describe('when proper sequence is entered', () => {
     it('should trigger konami event', () => {
       document.dispatchEvent(upArrow);

projects/ngx-raptorize/src/lib/konamiCode.directive.ts

@@ -24,6 +24,9 @@ export class KonamiCodeDirective {
 
   @HostListener('document:keydown', ['$event'])
   handleKeyboardEvent(event: KeyboardEvent) {
+    if (!event.key) {
+      return;
+    }
     const key = event.key.toString();
 
     if (key) {