storybook/docs/snippets/web-components/button-story-primary-composition.js.mdx

```js
// Button.stories.js

export default {
  component: 'demo-button',
};

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

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