diff --git a/typescript/route.ts b/typescript/route.ts
new file mode 100644
index 0000000..7e1017f
--- /dev/null
+++ b/typescript/route.ts
@@ -0,0 +1,4 @@
+export function chooseRoute(blocked: boolean): string {
+  if (blocked) return 'alternate';
+  return 'direct';
+}