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606
backend/apis/nodejs/node_modules/emittery/index.d.ts generated vendored Normal file
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/* eslint-disable no-redeclare */
/**
Emittery accepts strings, symbols, and numbers as event names.
Symbol event names are preferred given that they can be used to avoid name collisions when your classes are extended, especially for internal events.
*/
type EventName = PropertyKey;
// Helper type for turning the passed `EventData` type map into a list of string keys that don't require data alongside the event name when emitting. Uses the same trick that `Omit` does internally to filter keys by building a map of keys to keys we want to keep, and then accessing all the keys to return just the list of keys we want to keep.
type DatalessEventNames<EventData> = {
[Key in keyof EventData]: EventData[Key] extends undefined ? Key : never;
}[keyof EventData];
declare const listenerAdded: unique symbol;
declare const listenerRemoved: unique symbol;
type _OmnipresentEventData = {[listenerAdded]: Emittery.ListenerChangedData; [listenerRemoved]: Emittery.ListenerChangedData};
/**
Emittery can collect and log debug information.
To enable this feature set the `DEBUG` environment variable to `emittery` or `*`. Additionally, you can set the static `isDebugEnabled` variable to true on the Emittery class, or `myEmitter.debug.enabled` on an instance of it for debugging a single instance.
See API for more information on how debugging works.
*/
type DebugLogger<EventData, Name extends keyof EventData> = (type: string, debugName: string, eventName?: Name, eventData?: EventData[Name]) => void;
/**
Configure debug options of an instance.
*/
interface DebugOptions<EventData> {
/**
Define a name for the instance of Emittery to use when outputting debug data.
@default undefined
@example
```
import Emittery = require('emittery');
Emittery.isDebugEnabled = true;
const emitter = new Emittery({debug: {name: 'myEmitter'}});
emitter.on('test', data => {
// …
});
emitter.emit('test');
//=> [16:43:20.417][emittery:subscribe][myEmitter] Event Name: test
// data: undefined
```
*/
readonly name: string;
/**
Toggle debug logging just for this instance.
@default false
@example
```
import Emittery = require('emittery');
const emitter1 = new Emittery({debug: {name: 'emitter1', enabled: true}});
const emitter2 = new Emittery({debug: {name: 'emitter2'}});
emitter1.on('test', data => {
// …
});
emitter2.on('test', data => {
// …
});
emitter1.emit('test');
//=> [16:43:20.417][emittery:subscribe][emitter1] Event Name: test
// data: undefined
emitter2.emit('test');
```
*/
enabled?: boolean;
/**
Function that handles debug data.
@default
```
(type, debugName, eventName, eventData) => {
eventData = JSON.stringify(eventData);
if (typeof eventName === 'symbol' || typeof eventName === 'number') {
eventName = eventName.toString();
}
const currentTime = new Date();
const logTime = `${currentTime.getHours()}:${currentTime.getMinutes()}:${currentTime.getSeconds()}.${currentTime.getMilliseconds()}`;
console.log(`[${logTime}][emittery:${type}][${debugName}] Event Name: ${eventName}\n\tdata: ${eventData}`);
}
```
@example
```
import Emittery = require('emittery');
const myLogger = (type, debugName, eventName, eventData) => console.log(`[${type}]: ${eventName}`);
const emitter = new Emittery({
debug: {
name: 'myEmitter',
enabled: true,
logger: myLogger
}
});
emitter.on('test', data => {
// …
});
emitter.emit('test');
//=> [subscribe]: test
```
*/
logger?: DebugLogger<EventData, keyof EventData>;
}
/**
Configuration options for Emittery.
*/
interface Options<EventData> {
debug?: DebugOptions<EventData>;
}
/**
A promise returned from `emittery.once` with an extra `off` method to cancel your subscription.
*/
interface EmitteryOncePromise<T> extends Promise<T> {
off(): void;
}
/**
Emittery is a strictly typed, fully async EventEmitter implementation. Event listeners can be registered with `on` or `once`, and events can be emitted with `emit`.
`Emittery` has a generic `EventData` type that can be provided by users to strongly type the list of events and the data passed to the listeners for those events. Pass an interface of {[eventName]: undefined | <eventArg>}, with all the event names as the keys and the values as the type of the argument passed to listeners if there is one, or `undefined` if there isn't.
@example
```
import Emittery = require('emittery');
const emitter = new Emittery<
// Pass `{[eventName: <string | symbol | number>]: undefined | <eventArg>}` as the first type argument for events that pass data to their listeners.
// A value of `undefined` in this map means the event listeners should expect no data, and a type other than `undefined` means the listeners will receive one argument of that type.
{
open: string,
close: undefined
}
>();
// Typechecks just fine because the data type for the `open` event is `string`.
emitter.emit('open', 'foo\n');
// Typechecks just fine because `close` is present but points to undefined in the event data type map.
emitter.emit('close');
// TS compilation error because `1` isn't assignable to `string`.
emitter.emit('open', 1);
// TS compilation error because `other` isn't defined in the event data type map.
emitter.emit('other');
```
*/
declare class Emittery<
EventData = Record<EventName, any>,
AllEventData = EventData & _OmnipresentEventData,
DatalessEvents = DatalessEventNames<EventData>
> {
/**
Toggle debug mode for all instances.
Default: `true` if the `DEBUG` environment variable is set to `emittery` or `*`, otherwise `false`.
@example
```
import Emittery = require('emittery');
Emittery.isDebugEnabled = true;
const emitter1 = new Emittery({debug: {name: 'myEmitter1'}});
const emitter2 = new Emittery({debug: {name: 'myEmitter2'}});
emitter1.on('test', data => {
// …
});
emitter2.on('otherTest', data => {
// …
});
emitter1.emit('test');
//=> [16:43:20.417][emittery:subscribe][myEmitter1] Event Name: test
// data: undefined
emitter2.emit('otherTest');
//=> [16:43:20.417][emittery:subscribe][myEmitter2] Event Name: otherTest
// data: undefined
```
*/
static isDebugEnabled: boolean;
/**
Fires when an event listener was added.
An object with `listener` and `eventName` (if `on` or `off` was used) is provided as event data.
@example
```
import Emittery = require('emittery');
const emitter = new Emittery();
emitter.on(Emittery.listenerAdded, ({listener, eventName}) => {
console.log(listener);
//=> data => {}
console.log(eventName);
//=> '🦄'
});
emitter.on('🦄', data => {
// Handle data
});
```
*/
static readonly listenerAdded: typeof listenerAdded;
/**
Fires when an event listener was removed.
An object with `listener` and `eventName` (if `on` or `off` was used) is provided as event data.
@example
```
import Emittery = require('emittery');
const emitter = new Emittery();
const off = emitter.on('🦄', data => {
// Handle data
});
emitter.on(Emittery.listenerRemoved, ({listener, eventName}) => {
console.log(listener);
//=> data => {}
console.log(eventName);
//=> '🦄'
});
off();
```
*/
static readonly listenerRemoved: typeof listenerRemoved;
/**
Debugging options for the current instance.
*/
debug: DebugOptions<EventData>;
/**
Create a new Emittery instance with the specified options.
@returns An instance of Emittery that you can use to listen for and emit events.
*/
constructor(options?: Options<EventData>);
/**
In TypeScript, it returns a decorator which mixins `Emittery` as property `emitteryPropertyName` and `methodNames`, or all `Emittery` methods if `methodNames` is not defined, into the target class.
@example
```
import Emittery = require('emittery');
@Emittery.mixin('emittery')
class MyClass {}
const instance = new MyClass();
instance.emit('event');
```
*/
static mixin(
emitteryPropertyName: string | symbol,
methodNames?: readonly string[]
): <T extends {new (...arguments_: any[]): any}>(klass: T) => T; // eslint-disable-line @typescript-eslint/prefer-function-type
/**
Subscribe to one or more events.
Using the same listener multiple times for the same event will result in only one method call per emitted event.
@returns An unsubscribe method.
@example
```
import Emittery = require('emittery');
const emitter = new Emittery();
emitter.on('🦄', data => {
console.log(data);
});
emitter.on(['🦄', '🐶'], data => {
console.log(data);
});
emitter.emit('🦄', '🌈'); // log => '🌈' x2
emitter.emit('🐶', '🍖'); // log => '🍖'
```
*/
on<Name extends keyof AllEventData>(
eventName: Name | Name[],
listener: (eventData: AllEventData[Name]) => void | Promise<void>
): Emittery.UnsubscribeFn;
/**
Get an async iterator which buffers data each time an event is emitted.
Call `return()` on the iterator to remove the subscription.
@example
```
import Emittery = require('emittery');
const emitter = new Emittery();
const iterator = emitter.events('🦄');
emitter.emit('🦄', '🌈1'); // Buffered
emitter.emit('🦄', '🌈2'); // Buffered
iterator
.next()
.then(({value, done}) => {
// done === false
// value === '🌈1'
return iterator.next();
})
.then(({value, done}) => {
// done === false
// value === '🌈2'
// Revoke subscription
return iterator.return();
})
.then(({done}) => {
// done === true
});
```
In practice you would usually consume the events using the [for await](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/for-await...of) statement. In that case, to revoke the subscription simply break the loop.
@example
```
import Emittery = require('emittery');
const emitter = new Emittery();
const iterator = emitter.events('🦄');
emitter.emit('🦄', '🌈1'); // Buffered
emitter.emit('🦄', '🌈2'); // Buffered
// In an async context.
for await (const data of iterator) {
if (data === '🌈2') {
break; // Revoke the subscription when we see the value `🌈2`.
}
}
```
It accepts multiple event names.
@example
```
import Emittery = require('emittery');
const emitter = new Emittery();
const iterator = emitter.events(['🦄', '🦊']);
emitter.emit('🦄', '🌈1'); // Buffered
emitter.emit('🦊', '🌈2'); // Buffered
iterator
.next()
.then(({value, done}) => {
// done === false
// value === '🌈1'
return iterator.next();
})
.then(({value, done}) => {
// done === false
// value === '🌈2'
// Revoke subscription
return iterator.return();
})
.then(({done}) => {
// done === true
});
```
*/
events<Name extends keyof EventData>(
eventName: Name | Name[]
): AsyncIterableIterator<EventData[Name]>;
/**
Remove one or more event subscriptions.
@example
```
import Emittery = require('emittery');
const emitter = new Emittery();
const listener = data => console.log(data);
(async () => {
emitter.on(['🦄', '🐶', '🦊'], listener);
await emitter.emit('🦄', 'a');
await emitter.emit('🐶', 'b');
await emitter.emit('🦊', 'c');
emitter.off('🦄', listener);
emitter.off(['🐶', '🦊'], listener);
await emitter.emit('🦄', 'a'); // nothing happens
await emitter.emit('🐶', 'b'); // nothing happens
await emitter.emit('🦊', 'c'); // nothing happens
})();
```
*/
off<Name extends keyof AllEventData>(
eventName: Name | Name[],
listener: (eventData: AllEventData[Name]) => void | Promise<void>
): void;
/**
Subscribe to one or more events only once. It will be unsubscribed after the first
event.
@returns The promise of event data when `eventName` is emitted. This promise is extended with an `off` method.
@example
```
import Emittery = require('emittery');
const emitter = new Emittery();
emitter.once('🦄').then(data => {
console.log(data);
//=> '🌈'
});
emitter.once(['🦄', '🐶']).then(data => {
console.log(data);
});
emitter.emit('🦄', '🌈'); // Logs `🌈` twice
emitter.emit('🐶', '🍖'); // Nothing happens
```
*/
once<Name extends keyof AllEventData>(eventName: Name | Name[]): EmitteryOncePromise<AllEventData[Name]>;
/**
Trigger an event asynchronously, optionally with some data. Listeners are called in the order they were added, but executed concurrently.
@returns A promise that resolves when all the event listeners are done. *Done* meaning executed if synchronous or resolved when an async/promise-returning function. You usually wouldn't want to wait for this, but you could for example catch possible errors. If any of the listeners throw/reject, the returned promise will be rejected with the error, but the other listeners will not be affected.
*/
emit<Name extends DatalessEvents>(eventName: Name): Promise<void>;
emit<Name extends keyof EventData>(
eventName: Name,
eventData: EventData[Name]
): Promise<void>;
/**
Same as `emit()`, but it waits for each listener to resolve before triggering the next one. This can be useful if your events depend on each other. Although ideally they should not. Prefer `emit()` whenever possible.
If any of the listeners throw/reject, the returned promise will be rejected with the error and the remaining listeners will *not* be called.
@returns A promise that resolves when all the event listeners are done.
*/
emitSerial<Name extends DatalessEvents>(eventName: Name): Promise<void>;
emitSerial<Name extends keyof EventData>(
eventName: Name,
eventData: EventData[Name]
): Promise<void>;
/**
Subscribe to be notified about any event.
@returns A method to unsubscribe.
*/
onAny(
listener: (
eventName: keyof EventData,
eventData: EventData[keyof EventData]
) => void | Promise<void>
): Emittery.UnsubscribeFn;
/**
Get an async iterator which buffers a tuple of an event name and data each time an event is emitted.
Call `return()` on the iterator to remove the subscription.
In the same way as for `events`, you can subscribe by using the `for await` statement.
@example
```
import Emittery = require('emittery');
const emitter = new Emittery();
const iterator = emitter.anyEvent();
emitter.emit('🦄', '🌈1'); // Buffered
emitter.emit('🌟', '🌈2'); // Buffered
iterator.next()
.then(({value, done}) => {
// done is false
// value is ['🦄', '🌈1']
return iterator.next();
})
.then(({value, done}) => {
// done is false
// value is ['🌟', '🌈2']
// revoke subscription
return iterator.return();
})
.then(({done}) => {
// done is true
});
```
*/
anyEvent(): AsyncIterableIterator<
[keyof EventData, EventData[keyof EventData]]
>;
/**
Remove an `onAny` subscription.
*/
offAny(
listener: (
eventName: keyof EventData,
eventData: EventData[keyof EventData]
) => void | Promise<void>
): void;
/**
Clear all event listeners on the instance.
If `eventName` is given, only the listeners for that event are cleared.
*/
clearListeners<Name extends keyof EventData>(eventName?: Name | Name[]): void;
/**
The number of listeners for the `eventName` or all events if not specified.
*/
listenerCount<Name extends keyof EventData>(eventName?: Name | Name[]): number;
/**
Bind the given `methodNames`, or all `Emittery` methods if `methodNames` is not defined, into the `target` object.
@example
```
import Emittery = require('emittery');
const object = {};
new Emittery().bindMethods(object);
object.emit('event');
```
*/
bindMethods(target: Record<string, unknown>, methodNames?: readonly string[]): void;
}
declare namespace Emittery {
/**
Removes an event subscription.
*/
type UnsubscribeFn = () => void;
/**
The data provided as `eventData` when listening for `Emittery.listenerAdded` or `Emittery.listenerRemoved`.
*/
interface ListenerChangedData {
/**
The listener that was added or removed.
*/
listener: (eventData?: unknown) => void | Promise<void>;
/**
The name of the event that was added or removed if `.on()` or `.off()` was used, or `undefined` if `.onAny()` or `.offAny()` was used.
*/
eventName?: EventName;
}
type OmnipresentEventData = _OmnipresentEventData;
}
export = Emittery;

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'use strict';
const {anyMap, producersMap, eventsMap} = require('./maps.js');
const anyProducer = Symbol('anyProducer');
const resolvedPromise = Promise.resolve();
// Define symbols for "meta" events.
const listenerAdded = Symbol('listenerAdded');
const listenerRemoved = Symbol('listenerRemoved');
let canEmitMetaEvents = false;
let isGlobalDebugEnabled = false;
function assertEventName(eventName) {
if (typeof eventName !== 'string' && typeof eventName !== 'symbol' && typeof eventName !== 'number') {
throw new TypeError('`eventName` must be a string, symbol, or number');
}
}
function assertListener(listener) {
if (typeof listener !== 'function') {
throw new TypeError('listener must be a function');
}
}
function getListeners(instance, eventName) {
const events = eventsMap.get(instance);
if (!events.has(eventName)) {
return;
}
return events.get(eventName);
}
function getEventProducers(instance, eventName) {
const key = typeof eventName === 'string' || typeof eventName === 'symbol' || typeof eventName === 'number' ? eventName : anyProducer;
const producers = producersMap.get(instance);
if (!producers.has(key)) {
return;
}
return producers.get(key);
}
function enqueueProducers(instance, eventName, eventData) {
const producers = producersMap.get(instance);
if (producers.has(eventName)) {
for (const producer of producers.get(eventName)) {
producer.enqueue(eventData);
}
}
if (producers.has(anyProducer)) {
const item = Promise.all([eventName, eventData]);
for (const producer of producers.get(anyProducer)) {
producer.enqueue(item);
}
}
}
function iterator(instance, eventNames) {
eventNames = Array.isArray(eventNames) ? eventNames : [eventNames];
let isFinished = false;
let flush = () => {};
let queue = [];
const producer = {
enqueue(item) {
queue.push(item);
flush();
},
finish() {
isFinished = true;
flush();
}
};
for (const eventName of eventNames) {
let set = getEventProducers(instance, eventName);
if (!set) {
set = new Set();
const producers = producersMap.get(instance);
producers.set(eventName, set);
}
set.add(producer);
}
return {
async next() {
if (!queue) {
return {done: true};
}
if (queue.length === 0) {
if (isFinished) {
queue = undefined;
return this.next();
}
await new Promise(resolve => {
flush = resolve;
});
return this.next();
}
return {
done: false,
value: await queue.shift()
};
},
async return(value) {
queue = undefined;
for (const eventName of eventNames) {
const set = getEventProducers(instance, eventName);
if (set) {
set.delete(producer);
if (set.size === 0) {
const producers = producersMap.get(instance);
producers.delete(eventName);
}
}
}
flush();
return arguments.length > 0 ?
{done: true, value: await value} :
{done: true};
},
[Symbol.asyncIterator]() {
return this;
}
};
}
function defaultMethodNamesOrAssert(methodNames) {
if (methodNames === undefined) {
return allEmitteryMethods;
}
if (!Array.isArray(methodNames)) {
throw new TypeError('`methodNames` must be an array of strings');
}
for (const methodName of methodNames) {
if (!allEmitteryMethods.includes(methodName)) {
if (typeof methodName !== 'string') {
throw new TypeError('`methodNames` element must be a string');
}
throw new Error(`${methodName} is not Emittery method`);
}
}
return methodNames;
}
const isMetaEvent = eventName => eventName === listenerAdded || eventName === listenerRemoved;
function emitMetaEvent(emitter, eventName, eventData) {
if (isMetaEvent(eventName)) {
try {
canEmitMetaEvents = true;
emitter.emit(eventName, eventData);
} finally {
canEmitMetaEvents = false;
}
}
}
class Emittery {
static mixin(emitteryPropertyName, methodNames) {
methodNames = defaultMethodNamesOrAssert(methodNames);
return target => {
if (typeof target !== 'function') {
throw new TypeError('`target` must be function');
}
for (const methodName of methodNames) {
if (target.prototype[methodName] !== undefined) {
throw new Error(`The property \`${methodName}\` already exists on \`target\``);
}
}
function getEmitteryProperty() {
Object.defineProperty(this, emitteryPropertyName, {
enumerable: false,
value: new Emittery()
});
return this[emitteryPropertyName];
}
Object.defineProperty(target.prototype, emitteryPropertyName, {
enumerable: false,
get: getEmitteryProperty
});
const emitteryMethodCaller = methodName => function (...args) {
return this[emitteryPropertyName][methodName](...args);
};
for (const methodName of methodNames) {
Object.defineProperty(target.prototype, methodName, {
enumerable: false,
value: emitteryMethodCaller(methodName)
});
}
return target;
};
}
static get isDebugEnabled() {
if (typeof process !== 'object') {
return isGlobalDebugEnabled;
}
const {env} = process || {env: {}};
return env.DEBUG === 'emittery' || env.DEBUG === '*' || isGlobalDebugEnabled;
}
static set isDebugEnabled(newValue) {
isGlobalDebugEnabled = newValue;
}
constructor(options = {}) {
anyMap.set(this, new Set());
eventsMap.set(this, new Map());
producersMap.set(this, new Map());
producersMap.get(this).set(anyProducer, new Set());
this.debug = options.debug || {};
if (this.debug.enabled === undefined) {
this.debug.enabled = false;
}
if (!this.debug.logger) {
this.debug.logger = (type, debugName, eventName, eventData) => {
try {
// TODO: Use https://github.com/sindresorhus/safe-stringify when the package is more mature. Just copy-paste the code.
eventData = JSON.stringify(eventData);
} catch {
eventData = `Object with the following keys failed to stringify: ${Object.keys(eventData).join(',')}`;
}
if (typeof eventName === 'symbol' || typeof eventName === 'number') {
eventName = eventName.toString();
}
const currentTime = new Date();
const logTime = `${currentTime.getHours()}:${currentTime.getMinutes()}:${currentTime.getSeconds()}.${currentTime.getMilliseconds()}`;
console.log(`[${logTime}][emittery:${type}][${debugName}] Event Name: ${eventName}\n\tdata: ${eventData}`);
};
}
}
logIfDebugEnabled(type, eventName, eventData) {
if (Emittery.isDebugEnabled || this.debug.enabled) {
this.debug.logger(type, this.debug.name, eventName, eventData);
}
}
on(eventNames, listener) {
assertListener(listener);
eventNames = Array.isArray(eventNames) ? eventNames : [eventNames];
for (const eventName of eventNames) {
assertEventName(eventName);
let set = getListeners(this, eventName);
if (!set) {
set = new Set();
const events = eventsMap.get(this);
events.set(eventName, set);
}
set.add(listener);
this.logIfDebugEnabled('subscribe', eventName, undefined);
if (!isMetaEvent(eventName)) {
emitMetaEvent(this, listenerAdded, {eventName, listener});
}
}
return this.off.bind(this, eventNames, listener);
}
off(eventNames, listener) {
assertListener(listener);
eventNames = Array.isArray(eventNames) ? eventNames : [eventNames];
for (const eventName of eventNames) {
assertEventName(eventName);
const set = getListeners(this, eventName);
if (set) {
set.delete(listener);
if (set.size === 0) {
const events = eventsMap.get(this);
events.delete(eventName);
}
}
this.logIfDebugEnabled('unsubscribe', eventName, undefined);
if (!isMetaEvent(eventName)) {
emitMetaEvent(this, listenerRemoved, {eventName, listener});
}
}
}
once(eventNames) {
let off_;
const promise = new Promise(resolve => {
off_ = this.on(eventNames, data => {
off_();
resolve(data);
});
});
promise.off = off_;
return promise;
}
events(eventNames) {
eventNames = Array.isArray(eventNames) ? eventNames : [eventNames];
for (const eventName of eventNames) {
assertEventName(eventName);
}
return iterator(this, eventNames);
}
async emit(eventName, eventData) {
assertEventName(eventName);
if (isMetaEvent(eventName) && !canEmitMetaEvents) {
throw new TypeError('`eventName` cannot be meta event `listenerAdded` or `listenerRemoved`');
}
this.logIfDebugEnabled('emit', eventName, eventData);
enqueueProducers(this, eventName, eventData);
const listeners = getListeners(this, eventName) || new Set();
const anyListeners = anyMap.get(this);
const staticListeners = [...listeners];
const staticAnyListeners = isMetaEvent(eventName) ? [] : [...anyListeners];
await resolvedPromise;
await Promise.all([
...staticListeners.map(async listener => {
if (listeners.has(listener)) {
return listener(eventData);
}
}),
...staticAnyListeners.map(async listener => {
if (anyListeners.has(listener)) {
return listener(eventName, eventData);
}
})
]);
}
async emitSerial(eventName, eventData) {
assertEventName(eventName);
if (isMetaEvent(eventName) && !canEmitMetaEvents) {
throw new TypeError('`eventName` cannot be meta event `listenerAdded` or `listenerRemoved`');
}
this.logIfDebugEnabled('emitSerial', eventName, eventData);
const listeners = getListeners(this, eventName) || new Set();
const anyListeners = anyMap.get(this);
const staticListeners = [...listeners];
const staticAnyListeners = [...anyListeners];
await resolvedPromise;
/* eslint-disable no-await-in-loop */
for (const listener of staticListeners) {
if (listeners.has(listener)) {
await listener(eventData);
}
}
for (const listener of staticAnyListeners) {
if (anyListeners.has(listener)) {
await listener(eventName, eventData);
}
}
/* eslint-enable no-await-in-loop */
}
onAny(listener) {
assertListener(listener);
this.logIfDebugEnabled('subscribeAny', undefined, undefined);
anyMap.get(this).add(listener);
emitMetaEvent(this, listenerAdded, {listener});
return this.offAny.bind(this, listener);
}
anyEvent() {
return iterator(this);
}
offAny(listener) {
assertListener(listener);
this.logIfDebugEnabled('unsubscribeAny', undefined, undefined);
emitMetaEvent(this, listenerRemoved, {listener});
anyMap.get(this).delete(listener);
}
clearListeners(eventNames) {
eventNames = Array.isArray(eventNames) ? eventNames : [eventNames];
for (const eventName of eventNames) {
this.logIfDebugEnabled('clear', eventName, undefined);
if (typeof eventName === 'string' || typeof eventName === 'symbol' || typeof eventName === 'number') {
const set = getListeners(this, eventName);
if (set) {
set.clear();
}
const producers = getEventProducers(this, eventName);
if (producers) {
for (const producer of producers) {
producer.finish();
}
producers.clear();
}
} else {
anyMap.get(this).clear();
for (const [eventName, listeners] of eventsMap.get(this).entries()) {
listeners.clear();
eventsMap.get(this).delete(eventName);
}
for (const [eventName, producers] of producersMap.get(this).entries()) {
for (const producer of producers) {
producer.finish();
}
producers.clear();
producersMap.get(this).delete(eventName);
}
}
}
}
listenerCount(eventNames) {
eventNames = Array.isArray(eventNames) ? eventNames : [eventNames];
let count = 0;
for (const eventName of eventNames) {
if (typeof eventName === 'string') {
count += anyMap.get(this).size + (getListeners(this, eventName) || new Set()).size +
(getEventProducers(this, eventName) || new Set()).size + (getEventProducers(this) || new Set()).size;
continue;
}
if (typeof eventName !== 'undefined') {
assertEventName(eventName);
}
count += anyMap.get(this).size;
for (const value of eventsMap.get(this).values()) {
count += value.size;
}
for (const value of producersMap.get(this).values()) {
count += value.size;
}
}
return count;
}
bindMethods(target, methodNames) {
if (typeof target !== 'object' || target === null) {
throw new TypeError('`target` must be an object');
}
methodNames = defaultMethodNamesOrAssert(methodNames);
for (const methodName of methodNames) {
if (target[methodName] !== undefined) {
throw new Error(`The property \`${methodName}\` already exists on \`target\``);
}
Object.defineProperty(target, methodName, {
enumerable: false,
value: this[methodName].bind(this)
});
}
}
}
const allEmitteryMethods = Object.getOwnPropertyNames(Emittery.prototype).filter(v => v !== 'constructor');
Object.defineProperty(Emittery, 'listenerAdded', {
value: listenerAdded,
writable: false,
enumerable: true,
configurable: false
});
Object.defineProperty(Emittery, 'listenerRemoved', {
value: listenerRemoved,
writable: false,
enumerable: true,
configurable: false
});
module.exports = Emittery;

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MIT License
Copyright (c) Sindre Sorhus <sindresorhus@gmail.com> (https://sindresorhus.com)
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.

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const anyMap = new WeakMap();
const eventsMap = new WeakMap();
const producersMap = new WeakMap();
module.exports = {
anyMap,
eventsMap,
producersMap
};

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{
"name": "emittery",
"version": "0.13.1",
"description": "Simple and modern async event emitter",
"license": "MIT",
"repository": "sindresorhus/emittery",
"funding": "https://github.com/sindresorhus/emittery?sponsor=1",
"author": {
"name": "Sindre Sorhus",
"email": "sindresorhus@gmail.com",
"url": "https://sindresorhus.com"
},
"engines": {
"node": ">=12"
},
"scripts": {
"test": "xo && nyc ava && tsd"
},
"files": [
"index.js",
"index.d.ts",
"maps.js"
],
"keywords": [
"event",
"emitter",
"eventemitter",
"events",
"async",
"emit",
"on",
"once",
"off",
"listener",
"subscribe",
"unsubscribe",
"pubsub",
"tiny",
"addlistener",
"addeventlistener",
"dispatch",
"dispatcher",
"observer",
"trigger",
"await",
"promise",
"typescript",
"ts",
"typed"
],
"devDependencies": {
"@types/node": "^15.6.1",
"ava": "^2.4.0",
"delay": "^4.3.0",
"nyc": "^15.0.0",
"p-event": "^4.1.0",
"tsd": "^0.19.1",
"xo": "^0.39.0"
},
"nyc": {
"reporter": [
"html",
"lcov",
"text"
]
}
}

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# <img src="media/header.png" width="1000">
> Simple and modern async event emitter
[![Coverage Status](https://codecov.io/gh/sindresorhus/emittery/branch/main/graph/badge.svg)](https://codecov.io/gh/sindresorhus/emittery)
[![](https://badgen.net/bundlephobia/minzip/emittery)](https://bundlephobia.com/result?p=emittery)
It works in Node.js and the browser (using a bundler).
Emitting events asynchronously is important for production code where you want the least amount of synchronous operations. Since JavaScript is single-threaded, no other code can run while doing synchronous operations. For Node.js, that means it will block other requests, defeating the strength of the platform, which is scalability through async. In the browser, a synchronous operation could potentially cause lags and block user interaction.
## Install
```
$ npm install emittery
```
## Usage
```js
const Emittery = require('emittery');
const emitter = new Emittery();
emitter.on('🦄', data => {
console.log(data);
});
const myUnicorn = Symbol('🦄');
emitter.on(myUnicorn, data => {
console.log(`Unicorns love ${data}`);
});
emitter.emit('🦄', '🌈'); // Will trigger printing '🌈'
emitter.emit(myUnicorn, '🦋'); // Will trigger printing 'Unicorns love 🦋'
```
## API
### eventName
Emittery accepts strings, symbols, and numbers as event names.
Symbol event names are preferred given that they can be used to avoid name collisions when your classes are extended, especially for internal events.
### isDebugEnabled
Toggle debug mode for all instances.
Default: `true` if the `DEBUG` environment variable is set to `emittery` or `*`, otherwise `false`.
Example:
```js
const Emittery = require('emittery');
Emittery.isDebugEnabled = true;
const emitter1 = new Emittery({debug: {name: 'myEmitter1'}});
const emitter2 = new Emittery({debug: {name: 'myEmitter2'}});
emitter1.on('test', data => {
// …
});
emitter2.on('otherTest', data => {
// …
});
emitter1.emit('test');
//=> [16:43:20.417][emittery:subscribe][myEmitter1] Event Name: test
// data: undefined
emitter2.emit('otherTest');
//=> [16:43:20.417][emittery:subscribe][myEmitter2] Event Name: otherTest
// data: undefined
```
### emitter = new Emittery(options?)
Create a new instance of Emittery.
#### options?
Type: `object`
Configure the new instance of Emittery.
##### debug?
Type: `object`
Configure the debugging options for this instance.
###### name
Type: `string`\
Default: `undefined`
Define a name for the instance of Emittery to use when outputting debug data.
Example:
```js
const Emittery = require('emittery');
Emittery.isDebugEnabled = true;
const emitter = new Emittery({debug: {name: 'myEmitter'}});
emitter.on('test', data => {
// …
});
emitter.emit('test');
//=> [16:43:20.417][emittery:subscribe][myEmitter] Event Name: test
// data: undefined
```
###### enabled?
Type: `boolean`\
Default: `false`
Toggle debug logging just for this instance.
Example:
```js
const Emittery = require('emittery');
const emitter1 = new Emittery({debug: {name: 'emitter1', enabled: true}});
const emitter2 = new Emittery({debug: {name: 'emitter2'}});
emitter1.on('test', data => {
// …
});
emitter2.on('test', data => {
// …
});
emitter1.emit('test');
//=> [16:43:20.417][emittery:subscribe][emitter1] Event Name: test
// data: undefined
emitter2.emit('test');
```
###### logger?
Type: `Function(string, string, EventName?, Record<string, any>?) => void`
Default:
```js
(type, debugName, eventName, eventData) => {
if (typeof eventData === 'object') {
eventData = JSON.stringify(eventData);
}
if (typeof eventName === 'symbol' || typeof eventName === 'number') {
eventName = eventName.toString();
}
const currentTime = new Date();
const logTime = `${currentTime.getHours()}:${currentTime.getMinutes()}:${currentTime.getSeconds()}.${currentTime.getMilliseconds()}`;
console.log(`[${logTime}][emittery:${type}][${debugName}] Event Name: ${eventName}\n\tdata: ${eventData}`);
}
```
Function that handles debug data.
Example:
```js
const Emittery = require('emittery');
const myLogger = (type, debugName, eventName, eventData) => console.log(`[${type}]: ${eventName}`);
const emitter = new Emittery({
debug: {
name: 'myEmitter',
enabled: true,
logger: myLogger
}
});
emitter.on('test', data => {
// …
});
emitter.emit('test');
//=> [subscribe]: test
```
#### on(eventName | eventName[], listener)
Subscribe to one or more events.
Returns an unsubscribe method.
Using the same listener multiple times for the same event will result in only one method call per emitted event.
```js
const Emittery = require('emittery');
const emitter = new Emittery();
emitter.on('🦄', data => {
console.log(data);
});
emitter.on(['🦄', '🐶'], data => {
console.log(data);
});
emitter.emit('🦄', '🌈'); // log => '🌈' x2
emitter.emit('🐶', '🍖'); // log => '🍖'
```
##### Custom subscribable events
Emittery exports some symbols which represent "meta" events that can be passed to `Emitter.on` and similar methods.
- `Emittery.listenerAdded` - Fires when an event listener was added.
- `Emittery.listenerRemoved` - Fires when an event listener was removed.
```js
const Emittery = require('emittery');
const emitter = new Emittery();
emitter.on(Emittery.listenerAdded, ({listener, eventName}) => {
console.log(listener);
//=> data => {}
console.log(eventName);
//=> '🦄'
});
emitter.on('🦄', data => {
// Handle data
});
```
###### Listener data
- `listener` - The listener that was added.
- `eventName` - The name of the event that was added or removed if `.on()` or `.off()` was used, or `undefined` if `.onAny()` or `.offAny()` was used.
Only events that are not of this type are able to trigger these events.
##### listener(data)
#### off(eventName | eventName[], listener)
Remove one or more event subscriptions.
```js
const Emittery = require('emittery');
const emitter = new Emittery();
const listener = data => console.log(data);
(async () => {
emitter.on(['🦄', '🐶', '🦊'], listener);
await emitter.emit('🦄', 'a');
await emitter.emit('🐶', 'b');
await emitter.emit('🦊', 'c');
emitter.off('🦄', listener);
emitter.off(['🐶', '🦊'], listener);
await emitter.emit('🦄', 'a'); // Nothing happens
await emitter.emit('🐶', 'b'); // Nothing happens
await emitter.emit('🦊', 'c'); // Nothing happens
})();
```
##### listener(data)
#### once(eventName | eventName[])
Subscribe to one or more events only once. It will be unsubscribed after the first event.
Returns a promise for the event data when `eventName` is emitted. This promise is extended with an `off` method.
```js
const Emittery = require('emittery');
const emitter = new Emittery();
emitter.once('🦄').then(data => {
console.log(data);
//=> '🌈'
});
emitter.once(['🦄', '🐶']).then(data => {
console.log(data);
});
emitter.emit('🦄', '🌈'); // Log => '🌈' x2
emitter.emit('🐶', '🍖'); // Nothing happens
```
#### events(eventName)
Get an async iterator which buffers data each time an event is emitted.
Call `return()` on the iterator to remove the subscription.
```js
const Emittery = require('emittery');
const emitter = new Emittery();
const iterator = emitter.events('🦄');
emitter.emit('🦄', '🌈1'); // Buffered
emitter.emit('🦄', '🌈2'); // Buffered
iterator
.next()
.then(({value, done}) => {
// done === false
// value === '🌈1'
return iterator.next();
})
.then(({value, done}) => {
// done === false
// value === '🌈2'
// Revoke subscription
return iterator.return();
})
.then(({done}) => {
// done === true
});
```
In practice, you would usually consume the events using the [for await](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/for-await...of) statement. In that case, to revoke the subscription simply break the loop.
```js
const Emittery = require('emittery');
const emitter = new Emittery();
const iterator = emitter.events('🦄');
emitter.emit('🦄', '🌈1'); // Buffered
emitter.emit('🦄', '🌈2'); // Buffered
// In an async context.
for await (const data of iterator) {
if (data === '🌈2') {
break; // Revoke the subscription when we see the value '🌈2'.
}
}
```
It accepts multiple event names.
```js
const Emittery = require('emittery');
const emitter = new Emittery();
const iterator = emitter.events(['🦄', '🦊']);
emitter.emit('🦄', '🌈1'); // Buffered
emitter.emit('🦊', '🌈2'); // Buffered
iterator
.next()
.then(({value, done}) => {
// done === false
// value === '🌈1'
return iterator.next();
})
.then(({value, done}) => {
// done === false
// value === '🌈2'
// Revoke subscription
return iterator.return();
})
.then(({done}) => {
// done === true
});
```
#### emit(eventName, data?)
Trigger an event asynchronously, optionally with some data. Listeners are called in the order they were added, but executed concurrently.
Returns a promise that resolves when all the event listeners are done. *Done* meaning executed if synchronous or resolved when an async/promise-returning function. You usually wouldn't want to wait for this, but you could for example catch possible errors. If any of the listeners throw/reject, the returned promise will be rejected with the error, but the other listeners will not be affected.
#### emitSerial(eventName, data?)
Same as above, but it waits for each listener to resolve before triggering the next one. This can be useful if your events depend on each other. Although ideally they should not. Prefer `emit()` whenever possible.
If any of the listeners throw/reject, the returned promise will be rejected with the error and the remaining listeners will *not* be called.
#### onAny(listener)
Subscribe to be notified about any event.
Returns a method to unsubscribe.
##### listener(eventName, data)
#### offAny(listener)
Remove an `onAny` subscription.
#### anyEvent()
Get an async iterator which buffers a tuple of an event name and data each time an event is emitted.
Call `return()` on the iterator to remove the subscription.
```js
const Emittery = require('emittery');
const emitter = new Emittery();
const iterator = emitter.anyEvent();
emitter.emit('🦄', '🌈1'); // Buffered
emitter.emit('🌟', '🌈2'); // Buffered
iterator.next()
.then(({value, done}) => {
// done === false
// value is ['🦄', '🌈1']
return iterator.next();
})
.then(({value, done}) => {
// done === false
// value is ['🌟', '🌈2']
// Revoke subscription
return iterator.return();
})
.then(({done}) => {
// done === true
});
```
In the same way as for `events`, you can subscribe by using the `for await` statement
#### clearListeners(eventNames?)
Clear all event listeners on the instance.
If `eventNames` is given, only the listeners for that events are cleared.
#### listenerCount(eventNames?)
The number of listeners for the `eventNames` or all events if not specified.
#### bindMethods(target, methodNames?)
Bind the given `methodNames`, or all `Emittery` methods if `methodNames` is not defined, into the `target` object.
```js
import Emittery = require('emittery');
const object = {};
new Emittery().bindMethods(object);
object.emit('event');
```
## TypeScript
The default `Emittery` class has generic types that can be provided by TypeScript users to strongly type the list of events and the data passed to their event listeners.
```ts
import Emittery = require('emittery');
const emitter = new Emittery<
// Pass `{[eventName]: undefined | <eventArg>}` as the first type argument for events that pass data to their listeners.
// A value of `undefined` in this map means the event listeners should expect no data, and a type other than `undefined` means the listeners will receive one argument of that type.
{
open: string,
close: undefined
}
>();
// Typechecks just fine because the data type for the `open` event is `string`.
emitter.emit('open', 'foo\n');
// Typechecks just fine because `close` is present but points to undefined in the event data type map.
emitter.emit('close');
// TS compilation error because `1` isn't assignable to `string`.
emitter.emit('open', 1);
// TS compilation error because `other` isn't defined in the event data type map.
emitter.emit('other');
```
### Emittery.mixin(emitteryPropertyName, methodNames?)
A decorator which mixins `Emittery` as property `emitteryPropertyName` and `methodNames`, or all `Emittery` methods if `methodNames` is not defined, into the target class.
```ts
import Emittery = require('emittery');
@Emittery.mixin('emittery')
class MyClass {}
const instance = new MyClass();
instance.emit('event');
```
## Scheduling details
Listeners are not invoked for events emitted *before* the listener was added. Removing a listener will prevent that listener from being invoked, even if events are in the process of being (asynchronously!) emitted. This also applies to `.clearListeners()`, which removes all listeners. Listeners will be called in the order they were added. So-called *any* listeners are called *after* event-specific listeners.
Note that when using `.emitSerial()`, a slow listener will delay invocation of subsequent listeners. It's possible for newer events to overtake older ones.
## Debugging
Emittery can collect and log debug information.
To enable this feature set the DEBUG environment variable to 'emittery' or '*'. Additionally you can set the static `isDebugEnabled` variable to true on the Emittery class, or `myEmitter.debug.enabled` on an instance of it for debugging a single instance.
See [API](#api) for more details on how debugging works.
## FAQ
### How is this different than the built-in `EventEmitter` in Node.js?
There are many things to not like about `EventEmitter`: its huge API surface, synchronous event emitting, magic error event, flawed memory leak detection. Emittery has none of that.
### Isn't `EventEmitter` synchronous for a reason?
Mostly backwards compatibility reasons. The Node.js team can't break the whole ecosystem.
It also allows silly code like this:
```js
let unicorn = false;
emitter.on('🦄', () => {
unicorn = true;
});
emitter.emit('🦄');
console.log(unicorn);
//=> true
```
But I would argue doing that shows a deeper lack of Node.js and async comprehension and is not something we should optimize for. The benefit of async emitting is much greater.
### Can you support multiple arguments for `emit()`?
No, just use [destructuring](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Destructuring_assignment):
```js
emitter.on('🦄', ([foo, bar]) => {
console.log(foo, bar);
});
emitter.emit('🦄', [foo, bar]);
```
## Related
- [p-event](https://github.com/sindresorhus/p-event) - Promisify an event by waiting for it to be emitted