timers: add hasRef method to Timeout & Immediate

Provide a way to check whether the current timer or immediate is refed.

PR-URL: https://github.com/nodejs/node/pull/20898
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Tiancheng "Timothy" Gu <timothygu99@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/test/parallel/test-timers-immediate-unref.js b/test/parallel/test-timers-immediate-unref.js
index 5b56eb7e1d..ecb26682c1 100644
--- a/test/parallel/test-timers-immediate-unref.js
+++ b/test/parallel/test-timers-immediate-unref.js
@@ -3,6 +3,14 @@
 const common = require('../common');
 const Countdown = require('../common/countdown');
 
+const assert = require('assert');
+
+const immediate = setImmediate(() => {});
+assert.strictEqual(immediate.hasRef(), true);
+immediate.unref();
+assert.strictEqual(immediate.hasRef(), false);
+clearImmediate(immediate);
+
 // This immediate should execute as it was unrefed and refed again.
 // It also confirms that unref/ref are chainable.
 setImmediate(common.mustCall(firstStep)).ref().unref().unref().ref();