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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);
}
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