```ts
// App.stories.ts

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

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

type Story = StoryObj;

export const Success: Story = {
  parameters: {
    fetch: {
      json: {
        JavaScript: 3390991,
        'C++': 44974,
        TypeScript: 15530,
        CoffeeScript: 12253,
        Python: 9383,
        C: 5341,
        Shell: 5115,
        HTML: 3420,
        CSS: 3171,
        Makefile: 189,
      },
    },
  },
};
```