From 266b86e8d077e05732e8339fcdfe6bdfdcde6707 Mon Sep 17 00:00:00 2001
From: Aysajan Eziz <aeziz@northset.ai>
Date: Mon, 13 Jul 2026 01:02:15 +0000
Subject: [PATCH] fix: prometheus/client_js#582

Signed-off-by: Aysajan Eziz <aeziz@northset.ai>
---
 index.d.ts         | 2 +-
 test/typescript.ts | 2 ++
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/index.d.ts b/index.d.ts
index 8c0ebb2c..ad40e625 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -304,7 +304,7 @@ type MetricValueWithName<T extends string> = MetricValue<T> & {
 
 type LabelValues<T extends string> = T extends NoLabelNameType
 	? Partial<Record<string, never>>
-	: Partial<Record<T, string | number>>;
+	: Partial<Record<T, string | number | string[]>>;
 
 interface MetricConfiguration<T extends string> {
 	name: string;
diff --git a/test/typescript.ts b/test/typescript.ts
index 80d899ce..2a0ff380 100644
--- a/test/typescript.ts
+++ b/test/typescript.ts
@@ -18,8 +18,10 @@ const registry = new Registry();
 const counter = new Counter({
 	name: 'typescript_test_counter',
 	help: 'TypeScript test counter',
+	labelNames: ['handler'],
 	registers: [registry],
 });
+counter.inc({ handler: ['/a', '/b'] });
 
 const metricsText: Promise<string> = registry.getMetricsAsString(counter);
 const gatewayWithRegistry = new Pushgateway('http://127.0.0.1:9091', registry);