code: function getOverrides (eventType, options) {
    if (eventType === 'KeyboardEvent' && options) {
      return {
        keyCode: options.keyCode || 0,
        key: options.key || 0,
        which: options.which || options.keyCode || 0
      }
    }
  }
docs: Get attributes which must be overriden manually.
  
  @param {String} eventType
  @param {Object} options.