```ts
// Button.stories.ts

import type { Meta, StoryObj } from '@storybook/web-components';

const meta: Meta = {
  title: 'Button',
  component: 'demo-button',
};
export default meta;

type Story = StoryObj;

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