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140654x 140654x 140654x 61x 15491x 15491x 15491x 15x 3x 3x 3x 15x 15x 15491x 61x 53x 53x 53x 61x 149x 149x 149x 149x 115x 1x 1x 114x 115x 149x 149x 149x 61x 6282x 6282x 6282x 6282x 6282x 3x 6282x 6282x 155x 109x 109x 155x 155x 6x 6x 6x 6x 6x 6x 6x 2x 2x 2x 2x 155x 149x 149x 149x 155x 6282x 6282x 6282x 6282x 6282x 61x 61x 6508x 6508x 1067x 1067x 1067x 1067x 6508x 6508x 6508x 6508x 6508x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x 61x | 'use strict';
const {
ArrayFrom,
Boolean,
Error,
FunctionPrototypeCall,
NumberIsInteger,
ObjectAssign,
ObjectDefineProperties,
ObjectDefineProperty,
ObjectGetOwnPropertyDescriptor,
ObjectGetOwnPropertyDescriptors,
ReflectApply,
SafeArrayIterator,
SafeFinalizationRegistry,
SafeMap,
SafeWeakMap,
SafeWeakRef,
SafeWeakSet,
String,
Symbol,
SymbolFor,
SymbolToStringTag,
} = primordials;
const {
codes: {
ERR_INVALID_ARG_TYPE,
ERR_EVENT_RECURSION,
ERR_MISSING_ARGS,
ERR_INVALID_THIS,
}
} = require('internal/errors');
const { validateObject, validateString } = require('internal/validators');
const {
customInspectSymbol,
kEmptyObject,
kEnumerableProperty,
} = require('internal/util');
const { inspect } = require('util');
const kIsEventTarget = SymbolFor('nodejs.event_target');
const kIsNodeEventTarget = Symbol('kIsNodeEventTarget');
const EventEmitter = require('events');
const {
kMaxEventTargetListeners,
kMaxEventTargetListenersWarned,
} = EventEmitter;
const kEvents = Symbol('kEvents');
const kIsBeingDispatched = Symbol('kIsBeingDispatched');
const kStop = Symbol('kStop');
const kTarget = Symbol('kTarget');
const kHandlers = Symbol('khandlers');
const kWeakHandler = Symbol('kWeak');
const kHybridDispatch = SymbolFor('nodejs.internal.kHybridDispatch');
const kCreateEvent = Symbol('kCreateEvent');
const kNewListener = Symbol('kNewListener');
const kRemoveListener = Symbol('kRemoveListener');
const kIsNodeStyleListener = Symbol('kIsNodeStyleListener');
const kTrustEvent = Symbol('kTrustEvent');
const { now } = require('internal/perf/utils');
const kType = Symbol('type');
const kDetail = Symbol('detail');
const isTrustedSet = new SafeWeakSet();
const isTrusted = ObjectGetOwnPropertyDescriptor({
get isTrusted() {
return isTrustedSet.has(this);
}
}, 'isTrusted').get;
function isEvent(value) {
return typeof value?.[kType] === 'string';
}
class Event {
#cancelable = false;
#bubbles = false;
#composed = false;
#defaultPrevented = false;
#timestamp = now();
#propagationStopped = false;
/**
* @param {string} type
* @param {{
* bubbles?: boolean,
* cancelable?: boolean,
* composed?: boolean,
* }} [options]
*/
constructor(type, options = kEmptyObject) {
if (arguments.length === 0)
throw new ERR_MISSING_ARGS('type');
validateObject(options, 'options');
const { bubbles, cancelable, composed } = options;
this.#cancelable = !!cancelable;
this.#bubbles = !!bubbles;
this.#composed = !!composed;
this[kType] = `${type}`;
if (options?.[kTrustEvent]) {
isTrustedSet.add(this);
}
// isTrusted is special (LegacyUnforgeable)
ObjectDefineProperty(this, 'isTrusted', {
__proto__: null,
get: isTrusted,
enumerable: true,
configurable: false
});
this[kTarget] = null;
this[kIsBeingDispatched] = false;
}
[customInspectSymbol](depth, options) {
if (!isEvent(this))
throw new ERR_INVALID_THIS('Event');
const name = this.constructor.name;
if (depth < 0)
return name;
const opts = ObjectAssign({}, options, {
depth: NumberIsInteger(options.depth) ? options.depth - 1 : options.depth
});
return `${name} ${inspect({
type: this[kType],
defaultPrevented: this.#defaultPrevented,
cancelable: this.#cancelable,
timeStamp: this.#timestamp,
}, opts)}`;
}
stopImmediatePropagation() {
if (!isEvent(this))
throw new ERR_INVALID_THIS('Event');
this[kStop] = true;
}
preventDefault() {
if (!isEvent(this))
throw new ERR_INVALID_THIS('Event');
this.#defaultPrevented = true;
}
/**
* @type {EventTarget}
*/
get target() {
if (!isEvent(this))
throw new ERR_INVALID_THIS('Event');
return this[kTarget];
}
/**
* @type {EventTarget}
*/
get currentTarget() {
if (!isEvent(this))
throw new ERR_INVALID_THIS('Event');
return this[kTarget];
}
/**
* @type {EventTarget}
*/
get srcElement() {
if (!isEvent(this))
throw new ERR_INVALID_THIS('Event');
return this[kTarget];
}
/**
* @type {string}
*/
get type() {
if (!isEvent(this))
throw new ERR_INVALID_THIS('Event');
return this[kType];
}
/**
* @type {boolean}
*/
get cancelable() {
if (!isEvent(this))
throw new ERR_INVALID_THIS('Event');
return this.#cancelable;
}
/**
* @type {boolean}
*/
get defaultPrevented() {
if (!isEvent(this))
throw new ERR_INVALID_THIS('Event');
return this.#cancelable && this.#defaultPrevented;
}
/**
* @type {number}
*/
get timeStamp() {
if (!isEvent(this))
throw new ERR_INVALID_THIS('Event');
return this.#timestamp;
}
// The following are non-op and unused properties/methods from Web API Event.
// These are not supported in Node.js and are provided purely for
// API completeness.
/**
* @returns {EventTarget[]}
*/
composedPath() {
if (!isEvent(this))
throw new ERR_INVALID_THIS('Event');
return this[kIsBeingDispatched] ? [this[kTarget]] : [];
}
/**
* @type {boolean}
*/
get returnValue() {
if (!isEvent(this))
throw new ERR_INVALID_THIS('Event');
return !this.defaultPrevented;
}
/**
* @type {boolean}
*/
get bubbles() {
if (!isEvent(this))
throw new ERR_INVALID_THIS('Event');
return this.#bubbles;
}
/**
* @type {boolean}
*/
get composed() {
if (!isEvent(this))
throw new ERR_INVALID_THIS('Event');
return this.#composed;
}
/**
* @type {number}
*/
get eventPhase() {
if (!isEvent(this))
throw new ERR_INVALID_THIS('Event');
return this[kIsBeingDispatched] ? Event.AT_TARGET : Event.NONE;
}
/**
* @type {boolean}
*/
get cancelBubble() {
if (!isEvent(this))
throw new ERR_INVALID_THIS('Event');
return this.#propagationStopped;
}
/**
* @type {boolean}
*/
set cancelBubble(value) {
if (!isEvent(this))
throw new ERR_INVALID_THIS('Event');
if (value) {
this.stopPropagation();
}
}
stopPropagation() {
if (!isEvent(this))
throw new ERR_INVALID_THIS('Event');
this.#propagationStopped = true;
}
static NONE = 0;
static CAPTURING_PHASE = 1;
static AT_TARGET = 2;
static BUBBLING_PHASE = 3;
}
ObjectDefineProperties(
Event.prototype, {
[SymbolToStringTag]: {
__proto__: null,
writable: false,
enumerable: false,
configurable: true,
value: 'Event',
},
stopImmediatePropagation: kEnumerableProperty,
preventDefault: kEnumerableProperty,
target: kEnumerableProperty,
currentTarget: kEnumerableProperty,
srcElement: kEnumerableProperty,
type: kEnumerableProperty,
cancelable: kEnumerableProperty,
defaultPrevented: kEnumerableProperty,
timeStamp: kEnumerableProperty,
composedPath: kEnumerableProperty,
returnValue: kEnumerableProperty,
bubbles: kEnumerableProperty,
composed: kEnumerableProperty,
eventPhase: kEnumerableProperty,
cancelBubble: kEnumerableProperty,
stopPropagation: kEnumerableProperty,
});
function isCustomEvent(value) {
return isEvent(value) && (value?.[kDetail] !== undefined);
}
class CustomEvent extends Event {
/**
* @constructor
* @param {string} type
* @param {{
* bubbles?: boolean,
* cancelable?: boolean,
* composed?: boolean,
* detail?: any,
* }} [options]
*/
constructor(type, options = kEmptyObject) {
if (arguments.length === 0)
throw new ERR_MISSING_ARGS('type');
super(type, options);
this[kDetail] = options?.detail ?? null;
}
/**
* @type {any}
*/
get detail() {
if (!isCustomEvent(this))
throw new ERR_INVALID_THIS('CustomEvent');
return this[kDetail];
}
}
ObjectDefineProperties(CustomEvent.prototype, {
[SymbolToStringTag]: {
__proto__: null,
writable: false,
enumerable: false,
configurable: true,
value: 'CustomEvent',
},
detail: kEnumerableProperty,
});
class NodeCustomEvent extends Event {
constructor(type, options) {
super(type, options);
if (options?.detail) {
this.detail = options.detail;
}
}
}
// Weak listener cleanup
// This has to be lazy for snapshots to work
let weakListenersState = null;
// The resource needs to retain the callback so that it doesn't
// get garbage collected now that it's weak.
let objectToWeakListenerMap = null;
function weakListeners() {
weakListenersState ??= new SafeFinalizationRegistry(
(listener) => listener.remove()
);
objectToWeakListenerMap ??= new SafeWeakMap();
return { registry: weakListenersState, map: objectToWeakListenerMap };
}
// The listeners for an EventTarget are maintained as a linked list.
// Unfortunately, the way EventTarget is defined, listeners are accounted
// using the tuple [handler,capture], and even if we don't actually make
// use of capture or bubbling, in order to be spec compliant we have to
// take on the additional complexity of supporting it. Fortunately, using
// the linked list makes dispatching faster, even if adding/removing is
// slower.
class Listener {
constructor(previous, listener, once, capture, passive,
isNodeStyleListener, weak) {
this.next = undefined;
if (previous !== undefined)
previous.next = this;
this.previous = previous;
this.listener = listener;
// TODO(benjamingr) these 4 can be 'flags' to save 3 slots
this.once = once;
this.capture = capture;
this.passive = passive;
this.isNodeStyleListener = isNodeStyleListener;
this.removed = false;
this.weak = Boolean(weak); // Don't retain the object
if (this.weak) {
this.callback = new SafeWeakRef(listener);
weakListeners().registry.register(listener, this, this);
// Make the retainer retain the listener in a WeakMap
weakListeners().map.set(weak, listener);
this.listener = this.callback;
} else if (typeof listener === 'function') {
this.callback = listener;
this.listener = listener;
} else {
this.callback = async (...args) => {
if (listener.handleEvent)
await ReflectApply(listener.handleEvent, listener, args);
};
this.listener = listener;
}
}
same(listener, capture) {
const myListener = this.weak ? this.listener.deref() : this.listener;
return myListener === listener && this.capture === capture;
}
remove() {
if (this.previous !== undefined)
this.previous.next = this.next;
if (this.next !== undefined)
this.next.previous = this.previous;
this.removed = true;
if (this.weak)
weakListeners().registry.unregister(this);
}
}
function initEventTarget(self) {
self[kEvents] = new SafeMap();
self[kMaxEventTargetListeners] = EventEmitter.defaultMaxListeners;
self[kMaxEventTargetListenersWarned] = false;
}
class EventTarget {
// Used in checking whether an object is an EventTarget. This is a well-known
// symbol as EventTarget may be used cross-realm.
// Ref: https://github.com/nodejs/node/pull/33661
static [kIsEventTarget] = true;
constructor() {
initEventTarget(this);
}
[kNewListener](size, type, listener, once, capture, passive, weak) {
if (this[kMaxEventTargetListeners] > 0 &&
size > this[kMaxEventTargetListeners] &&
!this[kMaxEventTargetListenersWarned]) {
this[kMaxEventTargetListenersWarned] = true;
// No error code for this since it is a Warning
// eslint-disable-next-line no-restricted-syntax
const w = new Error('Possible EventTarget memory leak detected. ' +
`${size} ${type} listeners ` +
`added to ${inspect(this, { depth: -1 })}. Use ` +
'events.setMaxListeners() to increase limit');
w.name = 'MaxListenersExceededWarning';
w.target = this;
w.type = type;
w.count = size;
process.emitWarning(w);
}
}
[kRemoveListener](size, type, listener, capture) {}
/**
* @callback EventTargetCallback
* @param {Event} event
*/
/**
* @typedef {{ handleEvent: EventTargetCallback }} EventListener
*/
/**
* @param {string} type
* @param {EventTargetCallback|EventListener} listener
* @param {{
* capture?: boolean,
* once?: boolean,
* passive?: boolean,
* signal?: AbortSignal
* }} [options]
*/
addEventListener(type, listener, options = kEmptyObject) {
if (!isEventTarget(this))
throw new ERR_INVALID_THIS('EventTarget');
if (arguments.length < 2)
throw new ERR_MISSING_ARGS('type', 'listener');
// We validateOptions before the validateListener check because the spec
// requires us to hit getters.
const {
once,
capture,
passive,
signal,
isNodeStyleListener,
weak,
} = validateEventListenerOptions(options);
if (!validateEventListener(listener)) {
// The DOM silently allows passing undefined as a second argument
// No error code for this since it is a Warning
// eslint-disable-next-line no-restricted-syntax
const w = new Error(`addEventListener called with ${listener}` +
' which has no effect.');
w.name = 'AddEventListenerArgumentTypeWarning';
w.target = this;
w.type = type;
process.emitWarning(w);
return;
}
type = String(type);
if (signal) {
if (signal.aborted) {
return;
}
// TODO(benjamingr) make this weak somehow? ideally the signal would
// not prevent the event target from GC.
signal.addEventListener('abort', () => {
this.removeEventListener(type, listener, options);
}, { once: true, [kWeakHandler]: this });
}
let root = this[kEvents].get(type);
if (root === undefined) {
root = { size: 1, next: undefined };
// This is the first handler in our linked list.
new Listener(root, listener, once, capture, passive,
isNodeStyleListener, weak);
this[kNewListener](
root.size,
type,
listener,
once,
capture,
passive,
weak);
this[kEvents].set(type, root);
return;
}
let handler = root.next;
let previous = root;
// We have to walk the linked list to see if we have a match
while (handler !== undefined && !handler.same(listener, capture)) {
previous = handler;
handler = handler.next;
}
if (handler !== undefined) { // Duplicate! Ignore
return;
}
new Listener(previous, listener, once, capture, passive,
isNodeStyleListener, weak);
root.size++;
this[kNewListener](root.size, type, listener, once, capture, passive, weak);
}
/**
* @param {string} type
* @param {EventTargetCallback|EventListener} listener
* @param {{
* capture?: boolean,
* }} [options]
*/
removeEventListener(type, listener, options = kEmptyObject) {
if (!isEventTarget(this))
throw new ERR_INVALID_THIS('EventTarget');
if (!validateEventListener(listener))
return;
type = String(type);
const capture = options?.capture === true;
const root = this[kEvents].get(type);
if (root === undefined || root.next === undefined)
return;
let handler = root.next;
while (handler !== undefined) {
if (handler.same(listener, capture)) {
handler.remove();
root.size--;
if (root.size === 0)
this[kEvents].delete(type);
this[kRemoveListener](root.size, type, listener, capture);
break;
}
handler = handler.next;
}
}
/**
* @param {Event} event
*/
dispatchEvent(event) {
if (!isEventTarget(this))
throw new ERR_INVALID_THIS('EventTarget');
if (!(event instanceof Event))
throw new ERR_INVALID_ARG_TYPE('event', 'Event', event);
if (event[kIsBeingDispatched])
throw new ERR_EVENT_RECURSION(event.type);
this[kHybridDispatch](event, event.type, event);
return event.defaultPrevented !== true;
}
[kHybridDispatch](nodeValue, type, event) {
const createEvent = () => {
if (event === undefined) {
event = this[kCreateEvent](nodeValue, type);
event[kTarget] = this;
event[kIsBeingDispatched] = true;
}
return event;
};
if (event !== undefined) {
event[kTarget] = this;
event[kIsBeingDispatched] = true;
}
const root = this[kEvents].get(type);
if (root === undefined || root.next === undefined) {
if (event !== undefined)
event[kIsBeingDispatched] = false;
return true;
}
let handler = root.next;
let next;
while (handler !== undefined &&
(handler.passive || event?.[kStop] !== true)) {
// Cache the next item in case this iteration removes the current one
next = handler.next;
if (handler.removed) {
// Deal with the case an event is removed while event handlers are
// Being processed (removeEventListener called from a listener)
handler = next;
continue;
}
if (handler.once) {
handler.remove();
root.size--;
const { listener, capture } = handler;
this[kRemoveListener](root.size, type, listener, capture);
}
try {
let arg;
if (handler.isNodeStyleListener) {
arg = nodeValue;
} else {
arg = createEvent();
}
const callback = handler.weak ?
handler.callback.deref() : handler.callback;
let result;
if (callback) {
result = FunctionPrototypeCall(callback, this, arg);
if (!handler.isNodeStyleListener) {
arg[kIsBeingDispatched] = false;
}
}
if (result !== undefined && result !== null)
addCatch(result);
} catch (err) {
emitUncaughtException(err);
}
handler = next;
}
if (event !== undefined)
event[kIsBeingDispatched] = false;
}
[kCreateEvent](nodeValue, type) {
return new NodeCustomEvent(type, { detail: nodeValue });
}
[customInspectSymbol](depth, options) {
if (!isEventTarget(this))
throw new ERR_INVALID_THIS('EventTarget');
const name = this.constructor.name;
if (depth < 0)
return name;
const opts = ObjectAssign({}, options, {
depth: NumberIsInteger(options.depth) ? options.depth - 1 : options.depth
});
return `${name} ${inspect({}, opts)}`;
}
}
ObjectDefineProperties(EventTarget.prototype, {
addEventListener: kEnumerableProperty,
removeEventListener: kEnumerableProperty,
dispatchEvent: kEnumerableProperty,
[SymbolToStringTag]: {
__proto__: null,
writable: false,
enumerable: false,
configurable: true,
value: 'EventTarget',
}
});
function initNodeEventTarget(self) {
initEventTarget(self);
}
class NodeEventTarget extends EventTarget {
static [kIsNodeEventTarget] = true;
static defaultMaxListeners = 10;
constructor() {
super();
initNodeEventTarget(this);
}
/**
* @param {number} n
*/
setMaxListeners(n) {
if (!isNodeEventTarget(this))
throw new ERR_INVALID_THIS('NodeEventTarget');
EventEmitter.setMaxListeners(n, this);
}
/**
* @returns {number}
*/
getMaxListeners() {
if (!isNodeEventTarget(this))
throw new ERR_INVALID_THIS('NodeEventTarget');
return this[kMaxEventTargetListeners];
}
/**
* @returns {string[]}
*/
eventNames() {
if (!isNodeEventTarget(this))
throw new ERR_INVALID_THIS('NodeEventTarget');
return ArrayFrom(this[kEvents].keys());
}
/**
* @param {string} [type]
* @returns {number}
*/
listenerCount(type) {
if (!isNodeEventTarget(this))
throw new ERR_INVALID_THIS('NodeEventTarget');
const root = this[kEvents].get(String(type));
return root !== undefined ? root.size : 0;
}
/**
* @param {string} type
* @param {EventTargetCallback|EventListener} listener
* @param {{
* capture?: boolean,
* }} [options]
* @returns {NodeEventTarget}
*/
off(type, listener, options) {
if (!isNodeEventTarget(this))
throw new ERR_INVALID_THIS('NodeEventTarget');
this.removeEventListener(type, listener, options);
return this;
}
/**
* @param {string} type
* @param {EventTargetCallback|EventListener} listener
* @param {{
* capture?: boolean,
* }} [options]
* @returns {NodeEventTarget}
*/
removeListener(type, listener, options) {
if (!isNodeEventTarget(this))
throw new ERR_INVALID_THIS('NodeEventTarget');
this.removeEventListener(type, listener, options);
return this;
}
/**
* @param {string} type
* @param {EventTargetCallback|EventListener} listener
* @returns {NodeEventTarget}
*/
on(type, listener) {
if (!isNodeEventTarget(this))
throw new ERR_INVALID_THIS('NodeEventTarget');
this.addEventListener(type, listener, { [kIsNodeStyleListener]: true });
return this;
}
/**
* @param {string} type
* @param {EventTargetCallback|EventListener} listener
* @returns {NodeEventTarget}
*/
addListener(type, listener) {
if (!isNodeEventTarget(this))
throw new ERR_INVALID_THIS('NodeEventTarget');
this.addEventListener(type, listener, { [kIsNodeStyleListener]: true });
return this;
}
/**
* @param {string} type
* @param {any} arg
* @returns {boolean}
*/
emit(type, arg) {
if (!isNodeEventTarget(this))
throw new ERR_INVALID_THIS('NodeEventTarget');
validateString(type, 'type');
const hadListeners = this.listenerCount(type) > 0;
this[kHybridDispatch](arg, type);
return hadListeners;
}
/**
* @param {string} type
* @param {EventTargetCallback|EventListener} listener
* @returns {NodeEventTarget}
*/
once(type, listener) {
if (!isNodeEventTarget(this))
throw new ERR_INVALID_THIS('NodeEventTarget');
this.addEventListener(type, listener,
{ once: true, [kIsNodeStyleListener]: true });
return this;
}
/**
* @param {string} type
* @returns {NodeEventTarget}
*/
removeAllListeners(type) {
if (!isNodeEventTarget(this))
throw new ERR_INVALID_THIS('NodeEventTarget');
if (type !== undefined) {
this[kEvents].delete(String(type));
} else {
this[kEvents].clear();
}
return this;
}
}
ObjectDefineProperties(NodeEventTarget.prototype, {
setMaxListeners: kEnumerableProperty,
getMaxListeners: kEnumerableProperty,
eventNames: kEnumerableProperty,
listenerCount: kEnumerableProperty,
off: kEnumerableProperty,
removeListener: kEnumerableProperty,
on: kEnumerableProperty,
addListener: kEnumerableProperty,
once: kEnumerableProperty,
emit: kEnumerableProperty,
removeAllListeners: kEnumerableProperty,
});
// EventTarget API
function validateEventListener(listener) {
if (typeof listener === 'function' ||
typeof listener?.handleEvent === 'function') {
return true;
}
if (listener == null)
return false;
if (typeof listener === 'object') {
// Require `handleEvent` lazily.
return true;
}
throw new ERR_INVALID_ARG_TYPE('listener', 'EventListener', listener);
}
function validateEventListenerOptions(options) {
if (typeof options === 'boolean')
return { capture: options };
if (options === null)
return kEmptyObject;
validateObject(options, 'options', {
allowArray: true, allowFunction: true,
});
return {
once: Boolean(options.once),
capture: Boolean(options.capture),
passive: Boolean(options.passive),
signal: options.signal,
weak: options[kWeakHandler],
isNodeStyleListener: Boolean(options[kIsNodeStyleListener])
};
}
// Test whether the argument is an event object. This is far from a fool-proof
// test, for example this input will result in a false positive:
// > isEventTarget({ constructor: EventTarget })
// It stands in its current implementation as a compromise.
// Ref: https://github.com/nodejs/node/pull/33661
function isEventTarget(obj) {
return obj?.constructor?.[kIsEventTarget];
}
function isNodeEventTarget(obj) {
return obj?.constructor?.[kIsNodeEventTarget];
}
function addCatch(promise) {
const then = promise.then;
if (typeof then === 'function') {
FunctionPrototypeCall(then, promise, undefined, function(err) {
// The callback is called with nextTick to avoid a follow-up
// rejection from this promise.
emitUncaughtException(err);
});
}
}
function emitUncaughtException(err) {
process.nextTick(() => { throw err; });
}
function makeEventHandler(handler) {
// Event handlers are dispatched in the order they were first set
// See https://github.com/nodejs/node/pull/35949#issuecomment-722496598
function eventHandler(...args) {
if (typeof eventHandler.handler !== 'function') {
return;
}
return ReflectApply(eventHandler.handler, this, args);
}
eventHandler.handler = handler;
return eventHandler;
}
function defineEventHandler(emitter, name) {
// 8.1.5.1 Event handlers - basically `on[eventName]` attributes
ObjectDefineProperty(emitter, `on${name}`, {
__proto__: null,
get() {
return this[kHandlers]?.get(name)?.handler ?? null;
},
set(value) {
if (!this[kHandlers]) {
this[kHandlers] = new SafeMap();
}
let wrappedHandler = this[kHandlers]?.get(name);
if (wrappedHandler) {
if (typeof wrappedHandler.handler === 'function') {
this[kEvents].get(name).size--;
const size = this[kEvents].get(name).size;
this[kRemoveListener](size, name, wrappedHandler.handler, false);
}
wrappedHandler.handler = value;
if (typeof wrappedHandler.handler === 'function') {
this[kEvents].get(name).size++;
const size = this[kEvents].get(name).size;
this[kNewListener](size, name, value, false, false, false, false);
}
} else {
wrappedHandler = makeEventHandler(value);
this.addEventListener(name, wrappedHandler);
}
this[kHandlers].set(name, wrappedHandler);
},
configurable: true,
enumerable: true
});
}
const EventEmitterMixin = (Superclass) => {
class MixedEventEmitter extends Superclass {
constructor(...args) {
args = new SafeArrayIterator(args);
super(...args);
FunctionPrototypeCall(EventEmitter, this);
}
}
const protoProps = ObjectGetOwnPropertyDescriptors(EventEmitter.prototype);
delete protoProps.constructor;
ObjectDefineProperties(MixedEventEmitter.prototype, protoProps);
return MixedEventEmitter;
};
module.exports = {
Event,
CustomEvent,
EventEmitterMixin,
EventTarget,
NodeEventTarget,
defineEventHandler,
initEventTarget,
initNodeEventTarget,
kCreateEvent,
kNewListener,
kTrustEvent,
kRemoveListener,
kEvents,
kWeakHandler,
isEventTarget,
};
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