fbredius/storybook

```js
// addon-panel/register.js

import React from 'react';

import { AddonPanel } from '@storybook/components';

import { addons, types } from '@storybook/addons';

import { useGlobals } from '@storybook/api';

addons.register('my/panel', () => {
  addons.add('my-panel-addon/panel', {
    title: 'Example Storybook panel',
    //👇 Sets the type of UI element in Storybook
    type: types.PANEL,
    render: ({ active, key }) => (
      <AddonPanel key="panel" active={isActive}>
        <h2>I'm a panel addon in Storybook</h2>
      </AddonPanel>
    ),
  });
});
```