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add hasEventListener util for validate" · nodejs/node@db83d2f · GitHub

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@@ -276,12 +276,6 @@ ObjectDefineProperty(EventEmitter, 'defaultMaxListeners', {

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},

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});

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function hasEventListener(self, type) {

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if (type === undefined)

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return self._events !== undefined;

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

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};

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ObjectDefineProperties(EventEmitter, {

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kMaxEventTargetListeners: {

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__proto__: null,

@@ -675,11 +669,13 @@ EventEmitter.prototype.removeListener =

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function removeListener(type, listener) {

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checkListener(listener);

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if (!hasEventListener(this, type))

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const events = this._events;

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if (events === undefined)

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return this;

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const events = this._events;

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const list = events[type];

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if (list === undefined)

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return this;

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

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this._eventsCount -= 1;

@@ -733,9 +729,9 @@ EventEmitter.prototype.off = EventEmitter.prototype.removeListener;

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*/

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EventEmitter.prototype.removeAllListeners =

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function removeAllListeners(type) {

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if (!hasEventListener(this))

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return this;

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const events = this._events;

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if (events === undefined)

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return this;

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// Not listening for removeListener, no need to emit

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if (events.removeListener === undefined) {

@@ -780,10 +776,14 @@ EventEmitter.prototype.removeAllListeners =

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};

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function _listeners(target, type, unwrap) {

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if (!hasEventListener(target, type))

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const events = target._events;

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if (events === undefined)

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return [];

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const evlistener = target._events[type];

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const evlistener = events[type];

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if (evlistener === undefined)

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return [];

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if (typeof evlistener === 'function')

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

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