Add types to the exports (#488)

* fix: add types to exports in package.json

Add missing "types" definition to the exports object. In some cases the one
defined at the root level of the package json file is ignored if exports is
also defined.

* chore: add changeset

Co-authored-by: dominikg <[email protected]>

Author: AlexAegis

.changeset/shaggy-panthers-leave.md

@@ -0,0 +1,5 @@
+---
+'@sveltejs/vite-plugin-svelte': patch
+---
+
+add types to exports map in package.json

packages/vite-plugin-svelte/package.json

@@ -16,6 +16,7 @@
   "types": "dist/index.d.ts",
   "exports": {
     ".": {
+      "types": "./dist/index.d.ts",
       "import": "./dist/index.js",
       "require": "./dist/index.cjs"
     },