addon-docs: Props doesn't work when using React.memo.

Describe the bug I trying show the props in docs page using <Props of={Component}/> in .mdx file. But i receive this message “No props found for this component”

To Reproduce Steps to reproduce the behavior:

1. Create Component in React and wrapped this with React.memo
2. Run Storybook and open docs tab
3. The prop table does not appear

Screenshots

Code snippets

Button.js

function Button({ label, onClick }) {
  return (
    <ButtonContainer onClick={onClick}>
      <Label> {label} </Label>
    </ButtonContainer>
  );
}

Button.propTypes = {
  label: PropTypes.string.isRequired,
  onClick: PropTypes.func.isRequired,
};

export default React.memo(Button);

button.stories.mdx

# Button

Exemplo do **botão** padrão.

<Preview withToolbar>
  <Story name="Default" height="100px" parameters={{ decorators: [withKnobs] }}>
    <Button 
      labelColor={text("Label Color", theme.colors.white)}
      onClick={() => alert("Button Click")} />
  </Story>
</Preview>

## Props

<Props of={Button} />

System: OS: Linux 4.15 Ubuntu 18.04.3 LTS (Bionic Beaver) CPU: (4) x64 Intel® Core™ i5-3570 CPU @ 3.40GHz Binaries: Node: 10.15.3 - /usr/local/bin/node Yarn: 1.19.1 - /usr/bin/yarn npm: 6.4.1 - /usr/local/bin/npm Browsers: Chrome: 78.0.3904.108 Firefox: 72.0.1 npmPackages: @storybook/addon-actions: 5.3.7 => 5.3.7 @storybook/addon-backgrounds: 5.3.7 => 5.3.7 @storybook/addon-centered: 5.3.7 => 5.3.7 @storybook/addon-docs: 5.3.7 => 5.3.7 @storybook/addon-knobs: 5.3.7 => 5.3.7 @storybook/addon-storysource: 5.3.7 => 5.3.7 @storybook/addon-viewport: 5.3.7 => 5.3.7 @storybook/core: 5.3.7 => 5.3.7 @storybook/react: 5.3.7 => 5.3.7 @storybook/theming: 5.3.7 => 5.3.7 npmGlobalPackages: @storybook/cli: 5.3.4

[igloude]

FWIW I discovered that <Props of={MemoizedComponent.type} /> will correctly render a props table. No idea what’s going on under the hood there, lol

[shilman]

Unsatisfying workaround is to also export your pure component and use that for documentation purposes