function normalizeArrowKey(event) {
  const {key, keyCode} = event
  /* istanbul ignore next (ie) */
  if (keyCode >= 37 && keyCode <= 40 && key.indexOf('Arrow') !== 0) {
    return `Arrow${key}`
  }
  return key
}
Normalizes the 'key' property of a KeyboardEvent in IE/Edge
@param {Object} event a keyboardEvent object
@return {String} keyboard key