```ts
// Button.stories.ts

import { Button } from './button.component';

export default {
  component: Button,
};

export const Primary = {
  args: {
    label: 'Button',
    backgroundColor: '#ff0',
  },
};

export const Secondary = {
  args: {
    ...Primary.args,
    label: '😄👍😍💯',
  },
};

export const Tertiary = {
  args: {
    ...Primary.args,
    label: '📚📕📈🤓',
  },
};
```