Allow indexer parser walking on instance & add stories with legacy in…

…stance test

src/indexer/parser.ts

@@ -71,9 +71,19 @@ export async function parseForIndexer(
     },
 
     Root(node, context) {
-      const { module, fragment } = node;
+      const {
+        fragment,
+        // TODO: Remove it in the next major version
+        instance,
+        module,
+      } = node;
       const { state, visit } = context;
 
+      // TODO: Remove it in the next major version
+      if (legacyTemplate && instance) {
+        visit(instance, state);
+      }
+
       if (module) {
         visit(module, state);
       } else if (!legacyTemplate) {
@@ -83,12 +93,12 @@ export async function parseForIndexer(
       visit(fragment, state);
     },
 
+    // NOTE: We walk on instance (if flag was enabled - `Root` handles it) or module
     Script(node, context) {
-      const { content, context: scriptContext } = node;
+      const { content } = node;
       const { state, visit } = context;
-      if (scriptContext === 'module') {
-        visit(content, state);
-      }
+
+      visit(content, state);
     },
 
     Program(node, context) {

tests/stories/LegacyWithInstance.stories.svelte

@@ -0,0 +1,41 @@
+<script lang="ts">
+  import { Story, Template } from '@storybook/addon-svelte-csf';
+  import type { Meta } from '@storybook/svelte';
+
+  import LegacyTemplate from './LegacyTemplate.svelte';
+
+  /**
+   * Description set explicitly in the comment above export const meta.
+   *
+   * Multiline supported. And also Markdown syntax:
+   *
+   * * **Bold**,
+   * * _Italic_,
+   * * `Code`.
+   */
+  export const meta = {
+    title: 'LegacyTemplate',
+    component: LegacyTemplate,
+    tags: ['autodocs'],
+  } satisfies Meta<LegacyTemplate>;
+
+  let count = $state(0);
+
+  function handleClick() {
+    count += 1;
+  }
+</script>
+
+<Template let:args let:context>
+  <p>Using default template</p>
+  <LegacyTemplate {...args} onclick={handleClick} />
+</Template>
+
+<Template id="rounded" let:args>
+  <p>Using rounded template</p>
+  <LegacyTemplate {...args} onclick={handleClick} rounded />
+</Template>
+
+<Story name="Default" />
+
+<Story name="Rounded" template="rounded" />