diff --git a/src/IntersectionObserver.svelte b/src/IntersectionObserver.svelte
index 3f40621..6b6808a 100644
--- a/src/IntersectionObserver.svelte
+++ b/src/IntersectionObserver.svelte
@@ -1,6 +1,4 @@
 <script>
-  // @ts-check
-
   /**
    * The HTML Element to observe.
    * @type {null | HTMLElement}
diff --git a/tsconfig.json b/tsconfig.json
index 1666a59..b81211e 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,6 +1,7 @@
 {
   "compilerOptions": {
     "noEmit": true,
+    "checkJs": true,
     "esModuleInterop": true,
     "forceConsistentCasingInFileNames": true,
     "verbatimModuleSyntax": true,