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710x 711x 1x 1x 21347x 26x 26x 26x 26x 26x 26x 26x 26x 144x 144x 144x 144x 144x 132x 132x 132x 132x 132x 132x 132x 132x 2157x 2157x 2157x 1991x 1991x 166x 166x 166x 166x 2157x 3x 3x 3x 3x 3x 163x 163x 2157x 1x 1x 162x 162x 162x 162x 162x 132x 132x 132x 118x 118x 118x 118x 4x 4x 4x 4x 4x 4x 118x 118x 118x 118x 3x 3x 118x 118x 132x 132x 132x 2x 1x 1x 1x 1x 1x 1x 132x 132x 132x 128x 128x 132x 132x 132x 144x 128x 128x 131x 144x 4x 4x 4x 4x 4x 4x 131x 131x 131x 131x 3x 3x 131x 131x 2210x 2210x 144x 2210x 2066x 2066x 2210x 131x 131x 6x 6x 6x 6x 6x 4x 6x 2x 2x 2x 6x 6x 6x 144x | // Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.
'use strict';
const {
ArrayPrototypeJoin,
ArrayPrototypeShift,
ArrayPrototypeSlice,
ArrayPrototypeSplice,
ArrayPrototypeUnshift,
Boolean,
Error,
ErrorCaptureStackTrace,
FunctionPrototypeBind,
FunctionPrototypeCall,
NumberIsNaN,
ObjectCreate,
ObjectDefineProperty,
ObjectDefineProperties,
ObjectGetPrototypeOf,
ObjectSetPrototypeOf,
Promise,
PromiseReject,
PromiseResolve,
ReflectApply,
ReflectOwnKeys,
String,
StringPrototypeSplit,
Symbol,
SymbolFor,
SymbolAsyncIterator,
} = primordials;
const kRejection = SymbolFor('nodejs.rejection');
const { kEmptyObject } = require('internal/util');
const {
inspect,
identicalSequenceRange,
} = require('internal/util/inspect');
let spliceOne;
const {
AbortError,
kEnhanceStackBeforeInspector,
codes: {
ERR_INVALID_ARG_TYPE,
ERR_INVALID_THIS,
ERR_OUT_OF_RANGE,
ERR_UNHANDLED_ERROR
},
genericNodeError,
} = require('internal/errors');
const {
validateAbortSignal,
validateBoolean,
validateFunction,
validateString,
} = require('internal/validators');
const kCapture = Symbol('kCapture');
const kErrorMonitor = Symbol('events.errorMonitor');
const kMaxEventTargetListeners = Symbol('events.maxEventTargetListeners');
const kMaxEventTargetListenersWarned =
Symbol('events.maxEventTargetListenersWarned');
let EventEmitterAsyncResource;
// The EventEmitterAsyncResource has to be initialized lazily because event.js
// is loaded so early in the bootstrap process, before async_hooks is available.
//
// This implementation was adapted straight from addaleax's
// eventemitter-asyncresource MIT-licensed userland module.
// https://github.com/addaleax/eventemitter-asyncresource
function lazyEventEmitterAsyncResource() {
if (EventEmitterAsyncResource === undefined) {
const {
AsyncResource
} = require('async_hooks');
const kEventEmitter = Symbol('kEventEmitter');
const kAsyncResource = Symbol('kAsyncResource');
class EventEmitterReferencingAsyncResource extends AsyncResource {
/**
* @param {EventEmitter} ee
* @param {string} [type]
* @param {{
* triggerAsyncId?: number,
* requireManualDestroy?: boolean,
* }} [options]
*/
constructor(ee, type, options) {
super(type, options);
this[kEventEmitter] = ee;
}
/**
* @type {EventEmitter}
*/
get eventEmitter() {
if (this[kEventEmitter] === undefined)
throw new ERR_INVALID_THIS('EventEmitterReferencingAsyncResource');
return this[kEventEmitter];
}
}
EventEmitterAsyncResource =
class EventEmitterAsyncResource extends EventEmitter {
/**
* @param {{
* name?: string,
* triggerAsyncId?: number,
* requireManualDestroy?: boolean,
* }} [options]
*/
constructor(options = undefined) {
let name;
if (typeof options === 'string') {
name = options;
options = undefined;
} else {
if (new.target === EventEmitterAsyncResource) {
validateString(options?.name, 'options.name');
}
name = options?.name || new.target.name;
}
super(options);
this[kAsyncResource] =
new EventEmitterReferencingAsyncResource(this, name, options);
}
/**
* @param {symbol,string} event
* @param {...any} args
* @returns {boolean}
*/
emit(event, ...args) {
if (this[kAsyncResource] === undefined)
throw new ERR_INVALID_THIS('EventEmitterAsyncResource');
const { asyncResource } = this;
ArrayPrototypeUnshift(args, super.emit, this, event);
return ReflectApply(asyncResource.runInAsyncScope, asyncResource,
args);
}
/**
* @returns {void}
*/
emitDestroy() {
if (this[kAsyncResource] === undefined)
throw new ERR_INVALID_THIS('EventEmitterAsyncResource');
this.asyncResource.emitDestroy();
}
/**
* @type {number}
*/
get asyncId() {
if (this[kAsyncResource] === undefined)
throw new ERR_INVALID_THIS('EventEmitterAsyncResource');
return this.asyncResource.asyncId();
}
/**
* @type {number}
*/
get triggerAsyncId() {
if (this[kAsyncResource] === undefined)
throw new ERR_INVALID_THIS('EventEmitterAsyncResource');
return this.asyncResource.triggerAsyncId();
}
/**
* @type {EventEmitterReferencingAsyncResource}
*/
get asyncResource() {
if (this[kAsyncResource] === undefined)
throw new ERR_INVALID_THIS('EventEmitterAsyncResource');
return this[kAsyncResource];
}
};
}
return EventEmitterAsyncResource;
}
/**
* Creates a new `EventEmitter` instance.
* @param {{ captureRejections?: boolean; }} [opts]
* @constructs {EventEmitter}
*/
function EventEmitter(opts) {
EventEmitter.init.call(this, opts);
}
module.exports = EventEmitter;
module.exports.once = once;
module.exports.on = on;
module.exports.getEventListeners = getEventListeners;
// Backwards-compat with node 0.10.x
EventEmitter.EventEmitter = EventEmitter;
EventEmitter.usingDomains = false;
EventEmitter.captureRejectionSymbol = kRejection;
ObjectDefineProperty(EventEmitter, 'captureRejections', {
__proto__: null,
get() {
return EventEmitter.prototype[kCapture];
},
set(value) {
validateBoolean(value, 'EventEmitter.captureRejections');
EventEmitter.prototype[kCapture] = value;
},
enumerable: true
});
ObjectDefineProperty(EventEmitter, 'EventEmitterAsyncResource', {
__proto__: null,
enumerable: true,
get: lazyEventEmitterAsyncResource,
set: undefined,
configurable: true,
});
EventEmitter.errorMonitor = kErrorMonitor;
// The default for captureRejections is false
ObjectDefineProperty(EventEmitter.prototype, kCapture, {
__proto__: null,
value: false,
writable: true,
enumerable: false
});
EventEmitter.prototype._events = undefined;
EventEmitter.prototype._eventsCount = 0;
EventEmitter.prototype._maxListeners = undefined;
// By default EventEmitters will print a warning if more than 10 listeners are
// added to it. This is a useful default which helps finding memory leaks.
let defaultMaxListeners = 10;
let isEventTarget;
function checkListener(listener) {
validateFunction(listener, 'listener');
}
ObjectDefineProperty(EventEmitter, 'defaultMaxListeners', {
__proto__: null,
enumerable: true,
get: function() {
return defaultMaxListeners;
},
set: function(arg) {
if (typeof arg !== 'number' || arg < 0 || NumberIsNaN(arg)) {
throw new ERR_OUT_OF_RANGE('defaultMaxListeners',
'a non-negative number',
arg);
}
defaultMaxListeners = arg;
}
});
ObjectDefineProperties(EventEmitter, {
kMaxEventTargetListeners: {
__proto__: null,
value: kMaxEventTargetListeners,
enumerable: false,
configurable: false,
writable: false,
},
kMaxEventTargetListenersWarned: {
__proto__: null,
value: kMaxEventTargetListenersWarned,
enumerable: false,
configurable: false,
writable: false,
}
});
/**
* Sets the max listeners.
* @param {number} n
* @param {EventTarget[] | EventEmitter[]} [eventTargets]
* @returns {void}
*/
EventEmitter.setMaxListeners =
function(n = defaultMaxListeners, ...eventTargets) {
if (typeof n !== 'number' || n < 0 || NumberIsNaN(n))
throw new ERR_OUT_OF_RANGE('n', 'a non-negative number', n);
if (eventTargets.length === 0) {
defaultMaxListeners = n;
} else {
if (isEventTarget === undefined)
isEventTarget = require('internal/event_target').isEventTarget;
for (let i = 0; i < eventTargets.length; i++) {
const target = eventTargets[i];
if (isEventTarget(target)) {
target[kMaxEventTargetListeners] = n;
target[kMaxEventTargetListenersWarned] = false;
} else if (typeof target.setMaxListeners === 'function') {
target.setMaxListeners(n);
} else {
throw new ERR_INVALID_ARG_TYPE(
'eventTargets',
['EventEmitter', 'EventTarget'],
target);
}
}
}
};
// If you're updating this function definition, please also update any
// re-definitions, such as the one in the Domain module (lib/domain.js).
EventEmitter.init = function(opts) {
if (this._events === undefined ||
this._events === ObjectGetPrototypeOf(this)._events) {
this._events = ObjectCreate(null);
this._eventsCount = 0;
}
this._maxListeners = this._maxListeners || undefined;
if (opts?.captureRejections) {
validateBoolean(opts.captureRejections, 'options.captureRejections');
this[kCapture] = Boolean(opts.captureRejections);
} else {
// Assigning the kCapture property directly saves an expensive
// prototype lookup in a very sensitive hot path.
this[kCapture] = EventEmitter.prototype[kCapture];
}
};
function addCatch(that, promise, type, args) {
if (!that[kCapture]) {
return;
}
// Handle Promises/A+ spec, then could be a getter
// that throws on second use.
try {
const then = promise.then;
if (typeof then === 'function') {
then.call(promise, undefined, function(err) {
// The callback is called with nextTick to avoid a follow-up
// rejection from this promise.
process.nextTick(emitUnhandledRejectionOrErr, that, err, type, args);
});
}
} catch (err) {
that.emit('error', err);
}
}
function emitUnhandledRejectionOrErr(ee, err, type, args) {
if (typeof ee[kRejection] === 'function') {
ee[kRejection](err, type, ...args);
} else {
// We have to disable the capture rejections mechanism, otherwise
// we might end up in an infinite loop.
const prev = ee[kCapture];
// If the error handler throws, it is not catchable and it
// will end up in 'uncaughtException'. We restore the previous
// value of kCapture in case the uncaughtException is present
// and the exception is handled.
try {
ee[kCapture] = false;
ee.emit('error', err);
} finally {
ee[kCapture] = prev;
}
}
}
/**
* Increases the max listeners of the event emitter.
* @param {number} n
* @returns {EventEmitter}
*/
EventEmitter.prototype.setMaxListeners = function setMaxListeners(n) {
if (typeof n !== 'number' || n < 0 || NumberIsNaN(n)) {
throw new ERR_OUT_OF_RANGE('n', 'a non-negative number', n);
}
this._maxListeners = n;
return this;
};
function _getMaxListeners(that) {
if (that._maxListeners === undefined)
return EventEmitter.defaultMaxListeners;
return that._maxListeners;
}
/**
* Returns the current max listener value for the event emitter.
* @returns {number}
*/
EventEmitter.prototype.getMaxListeners = function getMaxListeners() {
return _getMaxListeners(this);
};
function enhanceStackTrace(err, own) {
let ctorInfo = '';
try {
const { name } = this.constructor;
if (name !== 'EventEmitter')
ctorInfo = ` on ${name} instance`;
} catch {
// Continue regardless of error.
}
const sep = `\nEmitted 'error' event${ctorInfo} at:\n`;
const errStack = ArrayPrototypeSlice(
StringPrototypeSplit(err.stack, '\n'), 1);
const ownStack = ArrayPrototypeSlice(
StringPrototypeSplit(own.stack, '\n'), 1);
const { len, offset } = identicalSequenceRange(ownStack, errStack);
if (len > 0) {
ArrayPrototypeSplice(ownStack, offset + 1, len - 2,
' [... lines matching original stack trace ...]');
}
return err.stack + sep + ArrayPrototypeJoin(ownStack, '\n');
}
/**
* Synchronously calls each of the listeners registered
* for the event.
* @param {string | symbol} type
* @param {...any} [args]
* @returns {boolean}
*/
EventEmitter.prototype.emit = function emit(type, ...args) {
let doError = (type === 'error');
const events = this._events;
if (events !== undefined) {
if (doError && events[kErrorMonitor] !== undefined)
this.emit(kErrorMonitor, ...args);
doError = (doError && events.error === undefined);
} else if (!doError)
return false;
// If there is no 'error' event listener then throw.
if (doError) {
let er;
if (args.length > 0)
er = args[0];
if (er instanceof Error) {
try {
const capture = {};
ErrorCaptureStackTrace(capture, EventEmitter.prototype.emit);
ObjectDefineProperty(er, kEnhanceStackBeforeInspector, {
__proto__: null,
value: FunctionPrototypeBind(enhanceStackTrace, this, er, capture),
configurable: true
});
} catch {
// Continue regardless of error.
}
// Note: The comments on the `throw` lines are intentional, they show
// up in Node's output if this results in an unhandled exception.
throw er; // Unhandled 'error' event
}
let stringifiedEr;
try {
stringifiedEr = inspect(er);
} catch {
stringifiedEr = er;
}
// At least give some kind of context to the user
const err = new ERR_UNHANDLED_ERROR(stringifiedEr);
err.context = er;
throw err; // Unhandled 'error' event
}
const handler = events[type];
if (handler === undefined)
return false;
if (typeof handler === 'function') {
const result = handler.apply(this, args);
// We check if result is undefined first because that
// is the most common case so we do not pay any perf
// penalty
if (result !== undefined && result !== null) {
addCatch(this, result, type, args);
}
} else {
const len = handler.length;
const listeners = arrayClone(handler);
for (let i = 0; i < len; ++i) {
const result = listeners[i].apply(this, args);
// We check if result is undefined first because that
// is the most common case so we do not pay any perf
// penalty.
// This code is duplicated because extracting it away
// would make it non-inlineable.
if (result !== undefined && result !== null) {
addCatch(this, result, type, args);
}
}
}
return true;
};
function _addListener(target, type, listener, prepend) {
let m;
let events;
let existing;
checkListener(listener);
events = target._events;
if (events === undefined) {
events = target._events = ObjectCreate(null);
target._eventsCount = 0;
} else {
// To avoid recursion in the case that type === "newListener"! Before
// adding it to the listeners, first emit "newListener".
if (events.newListener !== undefined) {
target.emit('newListener', type,
listener.listener ?? listener);
// Re-assign `events` because a newListener handler could have caused the
// this._events to be assigned to a new object
events = target._events;
}
existing = events[type];
}
if (existing === undefined) {
// Optimize the case of one listener. Don't need the extra array object.
events[type] = listener;
++target._eventsCount;
} else {
if (typeof existing === 'function') {
// Adding the second element, need to change to array.
existing = events[type] =
prepend ? [listener, existing] : [existing, listener];
// If we've already got an array, just append.
} else if (prepend) {
existing.unshift(listener);
} else {
existing.push(listener);
}
// Check for listener leak
m = _getMaxListeners(target);
if (m > 0 && existing.length > m && !existing.warned) {
existing.warned = true;
// No error code for this since it is a Warning
const w = genericNodeError(
`Possible EventEmitter memory leak detected. ${existing.length} ${String(type)} listeners ` +
`added to ${inspect(target, { depth: -1 })}. Use emitter.setMaxListeners() to increase limit`,
{ name: 'MaxListenersExceededWarning', emitter: target, type: type, count: existing.length });
process.emitWarning(w);
}
}
return target;
}
/**
* Adds a listener to the event emitter.
* @param {string | symbol} type
* @param {Function} listener
* @returns {EventEmitter}
*/
EventEmitter.prototype.addListener = function addListener(type, listener) {
return _addListener(this, type, listener, false);
};
EventEmitter.prototype.on = EventEmitter.prototype.addListener;
/**
* Adds the `listener` function to the beginning of
* the listeners array.
* @param {string | symbol} type
* @param {Function} listener
* @returns {EventEmitter}
*/
EventEmitter.prototype.prependListener =
function prependListener(type, listener) {
return _addListener(this, type, listener, true);
};
function onceWrapper() {
if (!this.fired) {
this.target.removeListener(this.type, this.wrapFn);
this.fired = true;
if (arguments.length === 0)
return this.listener.call(this.target);
return this.listener.apply(this.target, arguments);
}
}
function _onceWrap(target, type, listener) {
const state = { fired: false, wrapFn: undefined, target, type, listener };
const wrapped = onceWrapper.bind(state);
wrapped.listener = listener;
state.wrapFn = wrapped;
return wrapped;
}
/**
* Adds a one-time `listener` function to the event emitter.
* @param {string | symbol} type
* @param {Function} listener
* @returns {EventEmitter}
*/
EventEmitter.prototype.once = function once(type, listener) {
checkListener(listener);
this.on(type, _onceWrap(this, type, listener));
return this;
};
/**
* Adds a one-time `listener` function to the beginning of
* the listeners array.
* @param {string | symbol} type
* @param {Function} listener
* @returns {EventEmitter}
*/
EventEmitter.prototype.prependOnceListener =
function prependOnceListener(type, listener) {
checkListener(listener);
this.prependListener(type, _onceWrap(this, type, listener));
return this;
};
/**
* Removes the specified `listener` from the listeners array.
* @param {string | symbol} type
* @param {Function} listener
* @returns {EventEmitter}
*/
EventEmitter.prototype.removeListener =
function removeListener(type, listener) {
checkListener(listener);
const events = this._events;
if (events === undefined)
return this;
const list = events[type];
if (list === undefined)
return this;
if (list === listener || list.listener === listener) {
if (--this._eventsCount === 0)
this._events = ObjectCreate(null);
else {
delete events[type];
if (events.removeListener)
this.emit('removeListener', type, list.listener || listener);
}
} else if (typeof list !== 'function') {
let position = -1;
for (let i = list.length - 1; i >= 0; i--) {
if (list[i] === listener || list[i].listener === listener) {
position = i;
break;
}
}
if (position < 0)
return this;
if (position === 0)
list.shift();
else {
if (spliceOne === undefined)
spliceOne = require('internal/util').spliceOne;
spliceOne(list, position);
}
if (list.length === 1)
events[type] = list[0];
if (events.removeListener !== undefined)
this.emit('removeListener', type, listener);
}
return this;
};
EventEmitter.prototype.off = EventEmitter.prototype.removeListener;
/**
* Removes all listeners from the event emitter. (Only
* removes listeners for a specific event name if specified
* as `type`).
* @param {string | symbol} [type]
* @returns {EventEmitter}
*/
EventEmitter.prototype.removeAllListeners =
function removeAllListeners(type) {
const events = this._events;
if (events === undefined)
return this;
// Not listening for removeListener, no need to emit
if (events.removeListener === undefined) {
if (arguments.length === 0) {
this._events = ObjectCreate(null);
this._eventsCount = 0;
} else if (events[type] !== undefined) {
if (--this._eventsCount === 0)
this._events = ObjectCreate(null);
else
delete events[type];
}
return this;
}
// Emit removeListener for all listeners on all events
if (arguments.length === 0) {
for (const key of ReflectOwnKeys(events)) {
if (key === 'removeListener') continue;
this.removeAllListeners(key);
}
this.removeAllListeners('removeListener');
this._events = ObjectCreate(null);
this._eventsCount = 0;
return this;
}
const listeners = events[type];
if (typeof listeners === 'function') {
this.removeListener(type, listeners);
} else if (listeners !== undefined) {
// LIFO order
for (let i = listeners.length - 1; i >= 0; i--) {
this.removeListener(type, listeners[i]);
}
}
return this;
};
function _listeners(target, type, unwrap) {
const events = target._events;
if (events === undefined)
return [];
const evlistener = events[type];
if (evlistener === undefined)
return [];
if (typeof evlistener === 'function')
return unwrap ? [evlistener.listener || evlistener] : [evlistener];
return unwrap ?
unwrapListeners(evlistener) : arrayClone(evlistener);
}
/**
* Returns a copy of the array of listeners for the event name
* specified as `type`.
* @param {string | symbol} type
* @returns {Function[]}
*/
EventEmitter.prototype.listeners = function listeners(type) {
return _listeners(this, type, true);
};
/**
* Returns a copy of the array of listeners and wrappers for
* the event name specified as `type`.
* @param {string | symbol} type
* @returns {Function[]}
*/
EventEmitter.prototype.rawListeners = function rawListeners(type) {
return _listeners(this, type, false);
};
/**
* Returns the number of listeners listening to the event name
* specified as `type`.
* @deprecated since v3.2.0
* @param {EventEmitter} emitter
* @param {string | symbol} type
* @returns {number}
*/
EventEmitter.listenerCount = function(emitter, type) {
if (typeof emitter.listenerCount === 'function') {
return emitter.listenerCount(type);
}
return FunctionPrototypeCall(listenerCount, emitter, type);
};
EventEmitter.prototype.listenerCount = listenerCount;
/**
* Returns the number of listeners listening to event name
* specified as `type`.
* @param {string | symbol} type
* @returns {number}
*/
function listenerCount(type) {
const events = this._events;
if (events !== undefined) {
const evlistener = events[type];
if (typeof evlistener === 'function') {
return 1;
} else if (evlistener !== undefined) {
return evlistener.length;
}
}
return 0;
}
/**
* Returns an array listing the events for which
* the emitter has registered listeners.
* @returns {any[]}
*/
EventEmitter.prototype.eventNames = function eventNames() {
return this._eventsCount > 0 ? ReflectOwnKeys(this._events) : [];
};
function arrayClone(arr) {
// At least since V8 8.3, this implementation is faster than the previous
// which always used a simple for-loop
switch (arr.length) {
case 2: return [arr[0], arr[1]];
case 3: return [arr[0], arr[1], arr[2]];
case 4: return [arr[0], arr[1], arr[2], arr[3]];
case 5: return [arr[0], arr[1], arr[2], arr[3], arr[4]];
case 6: return [arr[0], arr[1], arr[2], arr[3], arr[4], arr[5]];
}
return ArrayPrototypeSlice(arr);
}
function unwrapListeners(arr) {
const ret = arrayClone(arr);
for (let i = 0; i < ret.length; ++i) {
const orig = ret[i].listener;
if (typeof orig === 'function')
ret[i] = orig;
}
return ret;
}
/**
* Returns a copy of the array of listeners for the event name
* specified as `type`.
* @param {EventEmitter | EventTarget} emitterOrTarget
* @param {string | symbol} type
* @returns {Function[]}
*/
function getEventListeners(emitterOrTarget, type) {
// First check if EventEmitter
if (typeof emitterOrTarget.listeners === 'function') {
return emitterOrTarget.listeners(type);
}
// Require event target lazily to avoid always loading it
const { isEventTarget, kEvents } = require('internal/event_target');
if (isEventTarget(emitterOrTarget)) {
const root = emitterOrTarget[kEvents].get(type);
const listeners = [];
let handler = root?.next;
while (handler?.listener !== undefined) {
const listener = handler.listener?.deref ?
handler.listener.deref() : handler.listener;
listeners.push(listener);
handler = handler.next;
}
return listeners;
}
throw new ERR_INVALID_ARG_TYPE('emitter',
['EventEmitter', 'EventTarget'],
emitterOrTarget);
}
/**
* Creates a `Promise` that is fulfilled when the emitter
* emits the given event.
* @param {EventEmitter} emitter
* @param {string} name
* @param {{ signal: AbortSignal; }} [options]
* @returns {Promise}
*/
async function once(emitter, name, options = kEmptyObject) {
const signal = options?.signal;
validateAbortSignal(signal, 'options.signal');
if (signal?.aborted)
throw new AbortError(undefined, { cause: signal?.reason });
return new Promise((resolve, reject) => {
const errorListener = (err) => {
emitter.removeListener(name, resolver);
if (signal != null) {
eventTargetAgnosticRemoveListener(signal, 'abort', abortListener);
}
reject(err);
};
const resolver = (...args) => {
if (typeof emitter.removeListener === 'function') {
emitter.removeListener('error', errorListener);
}
if (signal != null) {
eventTargetAgnosticRemoveListener(signal, 'abort', abortListener);
}
resolve(args);
};
eventTargetAgnosticAddListener(emitter, name, resolver, { once: true });
if (name !== 'error' && typeof emitter.once === 'function') {
// EventTarget does not have `error` event semantics like Node
// EventEmitters, we listen to `error` events only on EventEmitters.
emitter.once('error', errorListener);
}
function abortListener() {
eventTargetAgnosticRemoveListener(emitter, name, resolver);
eventTargetAgnosticRemoveListener(emitter, 'error', errorListener);
reject(new AbortError(undefined, { cause: signal?.reason }));
}
if (signal != null) {
eventTargetAgnosticAddListener(
signal, 'abort', abortListener, { once: true });
}
});
}
const AsyncIteratorPrototype = ObjectGetPrototypeOf(
ObjectGetPrototypeOf(async function* () {}).prototype);
function createIterResult(value, done) {
return { value, done };
}
function eventTargetAgnosticRemoveListener(emitter, name, listener, flags) {
if (typeof emitter.removeListener === 'function') {
emitter.removeListener(name, listener);
} else if (typeof emitter.removeEventListener === 'function') {
emitter.removeEventListener(name, listener, flags);
} else {
throw new ERR_INVALID_ARG_TYPE('emitter', 'EventEmitter', emitter);
}
}
function eventTargetAgnosticAddListener(emitter, name, listener, flags) {
if (typeof emitter.on === 'function') {
if (flags?.once) {
emitter.once(name, listener);
} else {
emitter.on(name, listener);
}
} else if (typeof emitter.addEventListener === 'function') {
emitter.addEventListener(name, listener, flags);
} else {
throw new ERR_INVALID_ARG_TYPE('emitter', 'EventEmitter', emitter);
}
}
/**
* Returns an `AsyncIterator` that iterates `event` events.
* @param {EventEmitter} emitter
* @param {string | symbol} event
* @param {{ signal: AbortSignal; }} [options]
* @returns {AsyncIterator}
*/
function on(emitter, event, options) {
const signal = options?.signal;
validateAbortSignal(signal, 'options.signal');
if (signal?.aborted)
throw new AbortError(undefined, { cause: signal?.reason });
const unconsumedEvents = [];
const unconsumedPromises = [];
let error = null;
let finished = false;
const iterator = ObjectSetPrototypeOf({
next() {
// First, we consume all unread events
const value = unconsumedEvents.shift();
if (value) {
return PromiseResolve(createIterResult(value, false));
}
// Then we error, if an error happened
// This happens one time if at all, because after 'error'
// we stop listening
if (error) {
const p = PromiseReject(error);
// Only the first element errors
error = null;
return p;
}
// If the iterator is finished, resolve to done
if (finished) {
return PromiseResolve(createIterResult(undefined, true));
}
// Wait until an event happens
return new Promise(function(resolve, reject) {
unconsumedPromises.push({ resolve, reject });
});
},
return() {
eventTargetAgnosticRemoveListener(emitter, event, eventHandler);
eventTargetAgnosticRemoveListener(emitter, 'error', errorHandler);
if (signal) {
eventTargetAgnosticRemoveListener(
signal,
'abort',
abortListener,
{ once: true });
}
finished = true;
for (const promise of unconsumedPromises) {
promise.resolve(createIterResult(undefined, true));
}
return PromiseResolve(createIterResult(undefined, true));
},
throw(err) {
if (!err || !(err instanceof Error)) {
throw new ERR_INVALID_ARG_TYPE('EventEmitter.AsyncIterator',
'Error', err);
}
error = err;
eventTargetAgnosticRemoveListener(emitter, event, eventHandler);
eventTargetAgnosticRemoveListener(emitter, 'error', errorHandler);
},
[SymbolAsyncIterator]() {
return this;
}
}, AsyncIteratorPrototype);
eventTargetAgnosticAddListener(emitter, event, eventHandler);
if (event !== 'error' && typeof emitter.on === 'function') {
emitter.on('error', errorHandler);
}
if (signal) {
eventTargetAgnosticAddListener(
signal,
'abort',
abortListener,
{ once: true });
}
return iterator;
function abortListener() {
errorHandler(new AbortError(undefined, { cause: signal?.reason }));
}
function eventHandler(...args) {
const promise = ArrayPrototypeShift(unconsumedPromises);
if (promise) {
promise.resolve(createIterResult(args, false));
} else {
unconsumedEvents.push(args);
}
}
function errorHandler(err) {
finished = true;
const toError = ArrayPrototypeShift(unconsumedPromises);
if (toError) {
toError.reject(err);
} else {
// The next time we call next()
error = err;
}
iterator.return();
}
}
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