events: add hasEventListener util for validate · nodejs/node@bdb6d12

},

});

function hasEventListener(self, type) {

if (type === undefined)

return self._events !== undefined;

return self._events !== undefined && self._events[type] !== undefined;

};

ObjectDefineProperties(EventEmitter, {

kMaxEventTargetListeners: {

__proto__: null,

function removeListener(type, listener) {

checkListener(listener);

const events = this._events;

if (events === undefined)

if (!hasEventListener(this, type))

return this;

const events = this._events;

const list = events[type];

if (list === undefined)

return this;

if (list === listener || list.listener === listener) {

this._eventsCount -= 1;

*/

EventEmitter.prototype.removeAllListeners =

function removeAllListeners(type) {

const events = this._events;

if (events === undefined)

if (!hasEventListener(this))

return this;

const events = this._events;

// Not listening for removeListener, no need to emit

if (events.removeListener === undefined) {

};

function _listeners(target, type, unwrap) {

const events = target._events;

if (events === undefined)

if (!hasEventListener(target, type))

return [];

const evlistener = events[type];

if (evlistener === undefined)

return [];

const evlistener = target._events[type];

if (typeof evlistener === 'function')

return unwrap ? [evlistener.listener || evlistener] : [evlistener];