fix: svelte type (#19)

* fix: svelte type

* Create itchy-seas-sort.md

Author: ota-meshi

.changeset/itchy-seas-sort.md

@@ -0,0 +1,5 @@
+---
+"typescript-eslint-parser-for-extra-files": patch
+---
+
+fix: svelte type

src/transform/svelte.ts

@@ -13,5 +13,7 @@ export function transformForSvelte(
     filename: context.filePath,
   });
 
-  return result.code;
+  return `/// <reference types="svelte2tsx/svelte-shims" />
+  
+${result.code}`;
 }