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Per https://github.com/nodejs/node/issues/1817, there are many modules that currently abuse the private `_events` property on EventEmitter. One of the ways it is used is to determine if a particular event is being listened for. This adds a simple `eventNames()` method that returns an array of the events with currently registered listeners. PR-URL: https://github.com/nodejs/node/pull/5617 Reviewed-By: Brian White <mscdex@mscdex.net> Reviewed-By: Сковорода Никита Андреевич <chalkerx@gmail.com> Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>
20 lines
554 B
JavaScript
20 lines
554 B
JavaScript
'use strict';
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require('../common');
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const EventEmitter = require('events');
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const assert = require('assert');
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const EE = new EventEmitter();
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const m = () => {};
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EE.on('foo', () => {});
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assert.deepStrictEqual(['foo'], EE.eventNames());
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EE.on('bar', m);
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assert.deepStrictEqual(['foo', 'bar'], EE.eventNames());
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EE.removeListener('bar', m);
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assert.deepStrictEqual(['foo'], EE.eventNames());
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const s = Symbol('s');
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EE.on(s, m);
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assert.deepStrictEqual(['foo', s], EE.eventNames());
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EE.removeListener(s, m);
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assert.deepStrictEqual(['foo'], EE.eventNames());
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