Tiny Crossbrowser Keycode checking function

keycode.js

/*
  usage:
    Events.on(window, 'keydown', (event) => {
      tabPressed = keycode(event, 13);
    });
*/
export default function keycode(event, code) {
  const property = event.key || event.keyIdentifier || event.keyCode;
  return property && property === code;
};