diff --git a/src/lib/components/description/Description.svelte b/src/lib/components/description/Description.svelte
index cdcbae9..5558d98 100644
--- a/src/lib/components/description/Description.svelte
+++ b/src/lib/components/description/Description.svelte
@@ -10,7 +10,7 @@
     );
   }
 
-  onMount(() => $contextStore.register(id));
+  onMount(() => $contextStore?.register(id));
 </script>
 
 <p {...$$restProps} {...$contextStore?.props} {id}>
diff --git a/src/lib/components/dialog/Dialog.svelte b/src/lib/components/dialog/Dialog.svelte
index ba6eacb..e5870da 100644
--- a/src/lib/components/dialog/Dialog.svelte
+++ b/src/lib/components/dialog/Dialog.svelte
@@ -66,7 +66,7 @@
   $: {
     open =
       open === undefined && openClosedState !== undefined
-        ? match($openClosedState, {
+        ? match($openClosedState!, {
             [State.Open]: true,
             [State.Closed]: false,
           })
diff --git a/src/lib/components/label/Label.svelte b/src/lib/components/label/Label.svelte
index 3d757c1..2723869 100644
--- a/src/lib/components/label/Label.svelte
+++ b/src/lib/components/label/Label.svelte
@@ -11,9 +11,9 @@
     );
   }
 
-  onMount(() => $contextStore.register(id));
+  onMount(() => $contextStore!.register(id));
 
-  let allProps = { ...$$restProps, ...$contextStore.props, id };
+  let allProps = { ...$$restProps, ...$contextStore!.props, id } as any;
   if (passive) delete allProps["onClick"];
 </script>
 
diff --git a/src/lib/hooks/use-portal.ts b/src/lib/hooks/use-portal.ts
index e86593b..1e07b22 100644
--- a/src/lib/hooks/use-portal.ts
+++ b/src/lib/hooks/use-portal.ts
@@ -1,12 +1,14 @@
-export function portal(element: HTMLElement, target: HTMLElement) {
-  target.append(element);
+export function portal(element: HTMLElement, target: HTMLElement | null | undefined) {
+  if (target) {
+    target.append(element);
+  }
   return {
     update(newTarget: HTMLElement) {
       target = newTarget;
       newTarget.append(element);
     },
     destroy() {
-      if (target.childNodes.length <= 0) {
+      if (target && target.childNodes.length <= 0) {
         target.parentElement?.removeChild(target);
       }
     },
diff --git a/tsconfig.json b/tsconfig.json
index b74bddb..3bc99b6 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -4,6 +4,7 @@
     "module": "es2020",
     "lib": ["es2020", "DOM"],
     "target": "es2020",
+    "strict": true,
     /**
 			svelte-preprocess cannot figure out whether you have a value or a type, so tell TypeScript
 			to enforce using \`import type\` instead of \`import\` for Types.