export class KeyCode {
   static backspace: number = 8;
   static tab: number = 9;
   static enter: number = 13;
   static shift: number = 16;
   static ctrl: number = 17;
   static alt: number = 18;
   static esc: number = 27;
   static space: number = 32;
   static pageUp: number = 33;
   static pageDown: number = 34;
   static end: number = 35;
   static home: number = 36;
   static left: number = 37;
   static up: number = 38;
   static right: number = 39;
   static down: number = 40;
   static insert: number = 45;
   static delete: number = 46;
   static a: number = 65;
}