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'use strict';
require('../common');
const assert = require('assert');
const events = require('events');
const util = require('util');
function listener() {}
function listener2() {}
class TestStream { constructor() { } }
util.inherits(TestStream, events.EventEmitter);
{
const ee = new events.EventEmitter();
ee.on('foo', listener);
const fooListeners = ee.listeners('foo');
assert.deepStrictEqual(ee.listeners('foo'), [listener]);
ee.removeAllListeners('foo');
assert.deepStrictEqual(ee.listeners('foo'), []);
assert.deepStrictEqual(fooListeners, [listener]);
}
{
const ee = new events.EventEmitter();
ee.on('foo', listener);
const eeListenersCopy = ee.listeners('foo');
assert.deepStrictEqual(eeListenersCopy, [listener]);
assert.deepStrictEqual(ee.listeners('foo'), [listener]);
eeListenersCopy.push(listener2);
assert.deepStrictEqual(ee.listeners('foo'), [listener]);
assert.deepStrictEqual(eeListenersCopy, [listener, listener2]);
}
{
const ee = new events.EventEmitter();
ee.on('foo', listener);
const eeListenersCopy = ee.listeners('foo');
ee.on('foo', listener2);
assert.deepStrictEqual(ee.listeners('foo'), [listener, listener2]);
assert.deepStrictEqual(eeListenersCopy, [listener]);
}
{
const ee = new events.EventEmitter();
ee.once('foo', listener);
assert.deepStrictEqual(ee.listeners('foo'), [listener]);
}
{
const ee = new events.EventEmitter();
ee.on('foo', listener);
ee.once('foo', listener2);
assert.deepStrictEqual(ee.listeners('foo'), [listener, listener2]);
}
{
const ee = new events.EventEmitter();
ee._events = undefined;
assert.deepStrictEqual(ee.listeners('foo'), []);
}
{
const s = new TestStream();
assert.deepStrictEqual(s.listeners('foo'), []);
}
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