```js
// Button.stories.js

import Button from './Button.svelte';

export default {
  component: Button,
};

export const Primary = {
  args: {
    backgroundColor: '#ff0',
    label: 'Button',
  },
  render: (args) => ({
    Component: Button,
    props: args,
  }),
};

export const Secondary = {
  args: {
    ...Primary.args,
    label: '😄👍😍💯',
  },
  render: (args) => ({
    Component: Button,
    props: args,
  }),
};

export const Tertiary = {
  args: {
    ...Primary.args,
    label: '📚📕📈🤓',
  },
  render: (args) => ({
    Component: Button,
    props: args,
  }),
};
```