```js
// Button.stories.js

import Button from './Button.svelte';

export default {
  /* 👇 The title prop is optional.
  * See https://storybook.js.org/docs/7.0/svelte/configure/overview#configure-story-loading
  * to learn how to generate automatic titles
  */
  title: 'Button',
  component: Button,
  //👇 Creates specific argTypes
  argTypes: {
    backgroundColor: { control: 'color' },
  },
};

//👇 Some function to demonstrate the behavior
const someFunction = (someValue) => {
  return `i am a ${someValue}`;
};

export const ExampleStory = (args) => {
  //👇 Destructure the label from the args object
  const { label } = args;

  //👇 Assigns the function result to a variable and pass it as a prop into the component
  const functionResult = someFunction(label);
  return {
    Component: Button,
    props: {
      ...args,
      label: functionResult,
    },
  };
};
ExampleStory.args = {
  primary: true,
  size: 'small',
  label: 'button',
};
```