lib: fix diagnostics_channel hasSubscribers error

Fixes: #36598
PR-URL: #36599
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>

Author: Lxxyx

lib/diagnostics_channel.js

@@ -8,7 +8,6 @@ const {
  ObjectGetPrototypeOf,
  ObjectSetPrototypeOf,
  SymbolHasInstance,
- WeakRefPrototypeGet
 }=primordials;
 
 const{
@@ -107,7 +106,7 @@ function channel(name) {
 functionhasSubscribers(name){
 letchannel;
 constref=channels[name];
-if(ref)channel=WeakRefPrototypeGet(ref);
+if(ref)channel=ref.get();
 if(!channel){
 returnfalse;
 }

test/parallel/test-diagnostics-channel-has-subscribers.js

@@ -0,0 +1,10 @@
+'use strict';
+require('../common');
+constassert=require('assert');
+const{ channel, hasSubscribers }=require('diagnostics_channel');
+
+constdc=channel('test');
+assert.ok(!hasSubscribers('test'));
+
+dc.subscribe(()=>{});
+assert.ok(hasSubscribers('test'));