2 files changed, 13 insertions, 11 deletions
diff --git a/api/_getFirstQueryParam.ts b/api/_getFirstQueryParam.ts
new file mode 100644
index 0000000..2073e7a
--- /dev/null
+++ b/api/_getFirstQueryParam.ts
@@ -0,0 +1,13 @@
+import type { VercelRequest } from '@vercel/node';
+
+export function getFirstQueryParam(key: string, query: VercelRequest['query']): string | null {
+  const value = query[key];
+  if (!value) {
+    return null;
+  }
+  if (typeof(value) === 'string') {
+    return value;
+  }
+  return value[0] as string;
+}
+
diff --git a/api/auth/registration.ts b/api/auth/registration.ts
index 9f1c377..912e5bf 100644
--- a/api/auth/registration.ts
+++ b/api/auth/registration.ts
@@ -96,17 +96,6 @@ async function handleGet(request: VercelRequest): Promise<(r: VercelResponse) =>
   return (response) => void (response.status(200).json(options));
 }
 
-function getFirstQueryParam(key: string, query: VercelRequest['query']): string | null {
-  const value = query[key];
-  if (!value) {
-    return null;
-  }
-  if (typeof(value) === 'string') {
-    return value;
-  }
-  return value[0] as string;
-}
-
 async function handlePost(request: VercelRequest): Promise<(r: VercelResponse) => void> {
   type Body = {
     userId: string,