From c0294a617a02b53ac9a4cd2351acb135782b4e15 Mon Sep 17 00:00:00 2001
From: CedarMist <134699267+CedarMist@users.noreply.github.com>
Date: Fri, 6 Sep 2024 16:36:28 +0100
Subject: [PATCH] integrations/viem: detect if unref exists on interval

---
 integrations/viem-v2/src/index.ts | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/integrations/viem-v2/src/index.ts b/integrations/viem-v2/src/index.ts
index d051fc57..a5902fa1 100644
--- a/integrations/viem-v2/src/index.ts
+++ b/integrations/viem-v2/src/index.ts
@@ -127,12 +127,15 @@ export async function createSapphireSerializer<
 	// The fetcher runs in the background, routinely fetching the keys
 	// This means when the serializer requests a calldata public key one will
 	// have been retrieved pre-emptively.
-	const intervalId = setInterval(async () => {
+	const intervalId: NodeJS.Timeout | number = setInterval(async () => {
 		await fetcher.fetch(provider);
 	}, fetcher.timeoutMilliseconds);
 	// The interval ID is unreferenced to prevent Node from hanging at exit
 	// See discussion on https://github.com/oasisprotocol/sapphire-paratime/pull/379
-	intervalId.unref();
+	// This is only available in NodeJS, and not in browsers
+	if( typeof intervalId.unref === 'function' ) {
+		intervalId.unref();
+	}
 
 	const wrappedSerializer = ((tx, sig?) => {
 		if (!sig) {