From 0a447b17b62491623bee52fa28613d5147e9b741 Mon Sep 17 00:00:00 2001
From: Pablo Damnhorns <pavel.chertorogov@gmail.com>
Date: Wed, 15 Jan 2020 14:04:44 +0600
Subject: [PATCH] Fix unref'ing the timer in some environments (#40)

Co-authored-by: Sindre Sorhus <sindresorhus@gmail.com>
---
 index.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/index.js b/index.js
index ec4ec49..f3e2210 100644
--- a/index.js
+++ b/index.js
@@ -53,7 +53,10 @@ module.exports = async options => {
 			lockedPorts.young = new Set();
 		}, releaseOldLockedPortsIntervalMs);
 
-		interval.unref();
+		// Does not exist in some environments (Electron, Jest jsdom env, browser, etc).
+		if (interval.unref) {
+			interval.unref();
+		}
 	}
 
 	for (const port of portCheckSequence(ports)) {