TS forwardRef support

[shilman]

The following input:

import React, { forwardRef } from 'react';

interface ButtonProps {
  variant?: 'small' | 'large';
  disabled?: boolean;
  children: React.ReactNode;
}

export const Button = forwardRef<HTMLButtonElement, ButtonProps>(function Button(
  { disabled = false, variant = 'small', children },
  ref
) {
  return (
    <button type="button" disabled={disabled} ref={ref}>
      {children} {variant}
    </button>
  );
});

Produces:

{}

It's come up several times in Storybook: storybookjs/storybook#8894 and storybookjs/storybook#9511

Filed from storybookjs/storybook#24165

[UTGuy]

I had to turn off docgen in storybook due to this bug. It keeps throwing errors and even my imports get hosed.