Feature request: remove undefined default props

[constgen]

Is it possible to implement removing of redundant defaultProps values definitions which are undefined?

Before trnasormation

FlyoutMenu.defaultProps = {
  centered: false,
  autofocus: true,
  className: undefined,
  innerRef: undefined,
  options: undefined,
  value: undefined,
  onSelect: undefined,
  children: undefined,
  id: undefined,
  role: undefined,
  style: undefined,
  onMouseLeave: undefined,
  onMouseDown: undefined,
  onBlur: undefined,
  enter: undefined,
  exit: undefined,
  in: undefined,
  onExited: undefined,
  overflow: undefined
};

After trnasormation

FlyoutMenu.defaultProps = {
  centered: false,
  autofocus: true
};