From 75e65a75dcb4042fff12b4687da24e9063898ed1 Mon Sep 17 00:00:00 2001
From: Julien Rousseau <julrousseau20@gmail.com>
Date: Wed, 22 Nov 2023 15:11:18 -0500
Subject: [PATCH] narrowed allowed labels

---
 src/prometheus.ts | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/prometheus.ts b/src/prometheus.ts
index da16250..9cf8261 100644
--- a/src/prometheus.ts
+++ b/src/prometheus.ts
@@ -8,10 +8,10 @@ export async function metrics() {
   return new Response(await registry.metrics(), { status: 200, headers });
 }
 
-export function registerCounter(name: string, help: string, labels?: string[]) {
+export function registerCounter<T extends string = string>(name: string, help: string, labels?: T[]) {
   try {
-    registry.registerMetric(new client.Counter({ name, help, labelNames: labels ?? []}));
-    return registry.getSingleMetric(name) as Counter;
+    registry.registerMetric(new client.Counter({ name, help, labelNames: labels ?? [] }));
+    return registry.getSingleMetric(name) as Counter<T>;
   } catch (error) {}
 }