```md
<!-- MyComponent.stories.mdx -->

import { Meta, Story, Canvas } from '@storybook/addon-docs';

import MyComponent from './MyComponent.svelte';

<Meta title="A MDX story using environment variables inside a .env file" component={MyComponent}/>

<!-- Render functions are a framework specific feature to allow you control on how the component renders -->

<Canvas>
  <Story
    name="A MDX story using environment variables inside a .env file"
    args={{
      propertyA: process.env.STORYBOOK_DATA_KEY,
    }}
    render={(args) => ({
      Component: MyComponent,
      props: args,
    })} />
</Canvas>
```