console: don't attach unnecessary error handlers

lib/internal/console/constructor.js

@@ -231,7 +231,8 @@ Console.prototype[kWriteToConsole] = function(streamSymbol, string) {
   // handle both situations.
   try {
     // Add and later remove a noop error handler to catch synchronous errors.
-    stream.once('error', noop);
+    if (stream.listenerCount('error') === 0)
+      stream.once('error', noop);
 
     stream.write(string, errorHandler);
   } catch (e) {

test/parallel/test-worker-console-listeners.js

@@ -0,0 +1,16 @@
+'use strict';
+const common = require('../common');
+const { Worker, isMainThread } = require('worker_threads');
+const EventEmitter = require('events');
+
+if (isMainThread) {
+  process.on('warning', common.mustNotCall('unexpected warning'));
+
+  for (let i = 0; i < EventEmitter.defaultMaxListeners; ++i) {
+    const worker = new Worker(__filename);
+
+    worker.on('exit', common.mustCall(() => {
+      console.log('a'); // This console.log() is part of the test.
+    }));
+  }
+}