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// Flags: --no-warnings 'use strict'; const common = require('../common'); const { setMaxListeners, EventEmitter } = require('events'); const assert = require('assert'); common.expectWarning({ MaxListenersExceededWarning: [ ['Possible EventTarget memory leak detected. 3 foo listeners added to ' + 'EventTarget. Use events.setMaxListeners() ' + 'to increase limit'], ['Possible EventTarget memory leak detected. 3 foo listeners added to ' + '[MessagePort [EventTarget]]. ' + 'Use events.setMaxListeners() to increase ' + 'limit'], ['Possible EventTarget memory leak detected. 3 foo listeners added to ' + '[MessagePort [EventTarget]]. ' + 'Use events.setMaxListeners() to increase ' + 'limit'], ['Possible EventTarget memory leak detected. 3 foo listeners added to ' + '[AbortSignal]. ' + 'Use events.setMaxListeners() to increase ' + 'limit'], ], }); { const et = new EventTarget(); setMaxListeners(2, et); et.addEventListener('foo', () => {}); et.addEventListener('foo', () => {}); et.addEventListener('foo', () => {}); } { // No warning emitted because prior limit was only for that // one EventTarget. const et = new EventTarget(); et.addEventListener('foo', () => {}); et.addEventListener('foo', () => {}); et.addEventListener('foo', () => {}); } { const mc = new MessageChannel(); setMaxListeners(2, mc.port1); mc.port1.addEventListener('foo', () => {}); mc.port1.addEventListener('foo', () => {}); mc.port1.addEventListener('foo', () => {}); } { // Set the default for newly created EventTargets setMaxListeners(2); const mc = new MessageChannel(); mc.port1.addEventListener('foo', () => {}); mc.port1.addEventListener('foo', () => {}); mc.port1.addEventListener('foo', () => {}); const ac = new AbortController(); ac.signal.addEventListener('foo', () => {}); ac.signal.addEventListener('foo', () => {}); ac.signal.addEventListener('foo', () => {}); } { // It works for EventEmitters also const ee = new EventEmitter(); setMaxListeners(2, ee); assert.strictEqual(ee.getMaxListeners(), 2); }