```js
// Button.stories.js | Button.stories.jsx

import React from 'react';

import { Button } from './Button';

export default {
  component: Button,
  //👇 Creates specific argTypes
  argTypes: {
    backgroundColor: { control: 'color' },
  },
  args: {
    //👇 Now all Button stories will be primary.
    primary: true,
  },
};
```