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

import Button from './Button';

export default {
  component: Button,
};

export const Primary = {
  args: {
    primary: true,
    label: 'Button',
  },
};

const Secondary = {
  args: {
    ...Primary.args,
    primary: false,
  },
};
```