```ts
// Checkbox.stories.ts

import type { Meta, StoryFn } from '@storybook/angular';

import { Checkbox } from './Checkbox.component';

export default {
  /* 👇 The title prop is optional.
  * See https://storybook.js.org/docs/angular/configure/overview#configure-story-loading
  * to learn how to generate automatic titles
  */
  title: 'Checkbox', 
  component: Checkbox,
} as Meta;

export const allCheckboxes: StoryFn = () => ({
  template: `
    <form>
      <Checkbox id="Unchecked" label="Unchecked" />
      <Checkbox id="Checked" label="Checked" checked />
      <Checkbox appearance="secondary" id="second" label="Secondary" checked />
    </form>
  `,
});
```