ReactElement doesn't work in propTypes

[fatso83]

I had this propTypes declaration:

ImageGallery.propTypes = propTypes(
  {
    classes: t.Object,
    className: t.maybe(t.String), // applied to root object
    width: t.maybe(t.String), // from withWidth() - needed for breakpoints
    images: t.list(GalleryImage),
    actionIconType: t.Function, // this is a React Element
    onSelect: t.maybe(t.Function),
    onPictureClick: t.maybe(t.Function),
    children: t.maybe(t.list(t.Object))
  },
  {strict: true}
);

which is used like this:

<ImageGallery 
    actionIconType={RemoveButton} 
    images={this.mapImagesToGalleryImages(includedImages, [])}
    onSelect={this.removeSelectedImage}/>

The actionIconType prop is a React Element, but it never matches. We had to convert it to t.Function for it to accept functional components.