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'use strict';
const common = require('../common');
const assert = require('assert');
const events = require('events');
function expect(expected) {
const actual = [];
process.on('exit', function() {
assert.deepStrictEqual(actual.sort(), expected.sort());
});
function listener(name) {
actual.push(name);
}
return common.mustCall(listener, expected.length);
}
function listener() {}
{
const ee = new events.EventEmitter();
ee.on('foo', listener);
ee.on('bar', listener);
ee.on('baz', listener);
ee.on('baz', listener);
const fooListeners = ee.listeners('foo');
const barListeners = ee.listeners('bar');
const bazListeners = ee.listeners('baz');
ee.on('removeListener', expect(['bar', 'baz', 'baz']));
ee.removeAllListeners('bar');
ee.removeAllListeners('baz');
assert.deepStrictEqual(ee.listeners('foo'), [listener]);
assert.deepStrictEqual(ee.listeners('bar'), []);
assert.deepStrictEqual(ee.listeners('baz'), []);
// After calling removeAllListeners(),
// the old listeners array should stay unchanged.
assert.deepStrictEqual(fooListeners, [listener]);
assert.deepStrictEqual(barListeners, [listener]);
assert.deepStrictEqual(bazListeners, [listener, listener]);
// After calling removeAllListeners(),
// new listeners arrays is different from the old.
assert.notEqual(ee.listeners('bar'), barListeners);
assert.notEqual(ee.listeners('baz'), bazListeners);
}
{
const ee = new events.EventEmitter();
ee.on('foo', listener);
ee.on('bar', listener);
// Expect LIFO order
ee.on('removeListener', expect(['foo', 'bar', 'removeListener']));
ee.on('removeListener', expect(['foo', 'bar']));
ee.removeAllListeners();
assert.deepStrictEqual([], ee.listeners('foo'));
assert.deepStrictEqual([], ee.listeners('bar'));
}
{
const ee = new events.EventEmitter();
ee.on('removeListener', listener);
// Check for regression where removeAllListeners() throws when
// there exists a 'removeListener' listener, but there exists
// no listeners for the provided event type.
assert.doesNotThrow(ee.removeAllListeners.bind(ee, 'foo'));
}
{
const ee = new events.EventEmitter();
var expectLength = 2;
ee.on('removeListener', function(name, listener) {
assert.strictEqual(expectLength--, this.listeners('baz').length);
});
ee.on('baz', function() {});
ee.on('baz', function() {});
ee.on('baz', function() {});
assert.strictEqual(ee.listeners('baz').length, expectLength + 1);
ee.removeAllListeners('baz');
assert.strictEqual(ee.listeners('baz').length, 0);
}
{
const ee = new events.EventEmitter();
assert.deepStrictEqual(ee, ee.removeAllListeners());
}
{
const ee = new events.EventEmitter();
ee._events = undefined;
assert.strictEqual(ee, ee.removeAllListeners());
}
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