From f47f20b44a84e93038788e75add0fae97930c6fd Mon Sep 17 00:00:00 2001
From: Nico Flaig <nflaig@protonmail.com>
Date: Wed, 12 Jul 2023 18:29:31 +0200
Subject: [PATCH] fix: increase max listeners of Worker (#2)

---
 src/master/implementation.node.ts | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/master/implementation.node.ts b/src/master/implementation.node.ts
index e42161bc..4f74dea9 100644
--- a/src/master/implementation.node.ts
+++ b/src/master/implementation.node.ts
@@ -124,6 +124,11 @@ function initWorkerThreadsWorker(): ImplementationExport {
         super(resolvedScriptPath, options)
       }
 
+      // Worker event emitter can have more than 10 listeners during normal operation
+      // Increase max listeners to prevent MaxListenersExceededWarning
+      // See https://github.com/ChainSafe/lodestar/issues/5552
+      this.setMaxListeners(100)
+
       this.mappedEventListeners = new WeakMap()
       allWorkers.push(this)
     }