fix: add type definitions to export (#176)

Author: adam-cowley

packages/language-support/package.json

@@ -26,7 +26,8 @@
     ".": {
       "require": "./dist/cjs/index.cjs",
       "import": "./dist/esm/index.mjs",
-      "default": "./dist/cjs/index.cjs"
+      "default": "./dist/cjs/index.cjs",
+      "types": "./dist/types/index.d.ts"
     }
   },
   "repository": {