Allows you to write your stories in .svelte syntax rather than .js syntax.

It supports:

• args stories and stories without args ;
• the "template" pattern for args stories, compatible with a svelte syntax ;
• extractions of sources of the stories and compatible with addon-sources
• decorators
• knobs, actions, controls
• storyshots (with a special jest transformation shipped under @storybook/addon-svelte-csf/jest-transform)

Have a basic button component:

<script>
  export let rounded = true;
</script>

<style>
  .rounded {
    border-radius: 35px;
  }

  button {
    border: 3px solid;
    padding: 10px 20px;
    background-color: white;
    outline: none;
  }
</style>

<button class="button" class:rounded on:click={onClick}>
  <slot />
</button>

And a button.stories.svelte file:

<script context="module">
  import Button from './Button.svelte';

  export const meta = {
    title: "Button",
    component: Button
  }
</script>

<script>
  import { Story, Template } from '@storybook/addon-svelte-csf';

  let count = 0;
  function handleClick() {
    count += 1;
  }
</script>

<Template let:args>
  <!--👇 'on:click' allows to forward event to addon-actions  -->
  <Button {...args} 
    on:click
    on:click={handleClick}>
    You clicked: {count}
  </Button>
</Template>

<Story name="Rounded" args={{rounded: true}}/>

<Story name="Square" source args={{rounded: false}}/>

<!-- Dynamic snippet should be disabled for this story -->
<Story name="Button No Args">
  <Button>Label</Button>
</Story>

Actions are automatically registered by Storybook. To be used by this addon, you just have to forward the event (on:click in the previous example).

1. npm install --save-dev @storybook/addon-svelte-csf or yarn add --dev @storybook/addon-svelte-csf
2. In .storybook/main.js, add @storybook/addon-svelte-csf to the addons array
3. In .storybook/main.js, add *.stories.svelte to the stories patterns

An example main.js configuration could look like this:

module.exports = {
  stories: ['../src/**/*.stories.@(js|jsx|ts|tsx|svelte)'],
  addons: [
    '@storybook/addon-links',
    '@storybook/addon-essentials',
    '@storybook/addon-interactions',
    '@storybook/addon-svelte-csf',
  ],
  framework: '@storybook/svelte-vite',
};

Version 4 of this addon requires at least:

• Storybook v7
• Svelte v4
• Vite v4 (if using Vite)
• @sveltejs/vite-plugin-svelte v2 (if using Vite)

If you're using Svelte v3 you can use version ^3.0.0 of this addon instead.

Version 3 of this addon requires at least Storybook v7.

If you're using Storybook between v6.4.20 and v7.0.0, you should instead use version ^2.0.0 of this addon.