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651 lines
28 KiB
651 lines
28 KiB
/** |
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* Much of the Node.js core API is built around an idiomatic asynchronous |
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* event-driven architecture in which certain kinds of objects (called "emitters") |
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* emit named events that cause `Function` objects ("listeners") to be called. |
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* |
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* For instance: a `net.Server` object emits an event each time a peer |
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* connects to it; a `fs.ReadStream` emits an event when the file is opened; |
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* a `stream` emits an event whenever data is available to be read. |
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* |
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* All objects that emit events are instances of the `EventEmitter` class. These |
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* objects expose an `eventEmitter.on()` function that allows one or more |
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* functions to be attached to named events emitted by the object. Typically, |
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* event names are camel-cased strings but any valid JavaScript property key |
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* can be used. |
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* |
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* When the `EventEmitter` object emits an event, all of the functions attached |
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* to that specific event are called _synchronously_. Any values returned by the |
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* called listeners are _ignored_ and discarded. |
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* |
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* The following example shows a simple `EventEmitter` instance with a single |
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* listener. The `eventEmitter.on()` method is used to register listeners, while |
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* the `eventEmitter.emit()` method is used to trigger the event. |
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* |
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* ```js |
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* const EventEmitter = require('events'); |
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* |
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* class MyEmitter extends EventEmitter {} |
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* |
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* const myEmitter = new MyEmitter(); |
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* myEmitter.on('event', () => { |
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* console.log('an event occurred!'); |
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* }); |
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* myEmitter.emit('event'); |
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* ``` |
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* @see [source](https://github.com/nodejs/node/blob/v17.0.0/lib/events.js) |
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*/ |
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declare module 'events' { |
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interface EventEmitterOptions { |
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/** |
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* Enables automatic capturing of promise rejection. |
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*/ |
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captureRejections?: boolean | undefined; |
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} |
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interface NodeEventTarget { |
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once(eventName: string | symbol, listener: (...args: any[]) => void): this; |
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} |
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interface DOMEventTarget { |
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addEventListener( |
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eventName: string, |
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listener: (...args: any[]) => void, |
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opts?: { |
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once: boolean; |
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}, |
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): any; |
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} |
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interface StaticEventEmitterOptions { |
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signal?: AbortSignal | undefined; |
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} |
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interface EventEmitter extends NodeJS.EventEmitter {} |
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/** |
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* The `EventEmitter` class is defined and exposed by the `events` module: |
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* |
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* ```js |
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* const EventEmitter = require('events'); |
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* ``` |
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* |
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* All `EventEmitter`s emit the event `'newListener'` when new listeners are |
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* added and `'removeListener'` when existing listeners are removed. |
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* |
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* It supports the following option: |
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* @since v0.1.26 |
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*/ |
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class EventEmitter { |
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constructor(options?: EventEmitterOptions); |
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/** |
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* Creates a `Promise` that is fulfilled when the `EventEmitter` emits the given |
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* event or that is rejected if the `EventEmitter` emits `'error'` while waiting. |
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* The `Promise` will resolve with an array of all the arguments emitted to the |
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* given event. |
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* |
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* This method is intentionally generic and works with the web platform [EventTarget](https://dom.spec.whatwg.org/#interface-eventtarget) interface, which has no special`'error'` event |
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* semantics and does not listen to the `'error'` event. |
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* |
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* ```js |
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* const { once, EventEmitter } = require('events'); |
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* |
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* async function run() { |
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* const ee = new EventEmitter(); |
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* |
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* process.nextTick(() => { |
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* ee.emit('myevent', 42); |
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* }); |
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* |
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* const [value] = await once(ee, 'myevent'); |
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* console.log(value); |
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* |
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* const err = new Error('kaboom'); |
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* process.nextTick(() => { |
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* ee.emit('error', err); |
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* }); |
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* |
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* try { |
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* await once(ee, 'myevent'); |
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* } catch (err) { |
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* console.log('error happened', err); |
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* } |
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* } |
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* |
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* run(); |
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* ``` |
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* |
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* The special handling of the `'error'` event is only used when `events.once()`is used to wait for another event. If `events.once()` is used to wait for the |
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* '`error'` event itself, then it is treated as any other kind of event without |
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* special handling: |
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* |
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* ```js |
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* const { EventEmitter, once } = require('events'); |
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* |
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* const ee = new EventEmitter(); |
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* |
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* once(ee, 'error') |
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* .then(([err]) => console.log('ok', err.message)) |
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* .catch((err) => console.log('error', err.message)); |
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* |
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* ee.emit('error', new Error('boom')); |
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* |
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* // Prints: ok boom |
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* ``` |
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* |
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* An `AbortSignal` can be used to cancel waiting for the event: |
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* |
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* ```js |
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* const { EventEmitter, once } = require('events'); |
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* |
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* const ee = new EventEmitter(); |
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* const ac = new AbortController(); |
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* |
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* async function foo(emitter, event, signal) { |
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* try { |
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* await once(emitter, event, { signal }); |
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* console.log('event emitted!'); |
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* } catch (error) { |
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* if (error.name === 'AbortError') { |
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* console.error('Waiting for the event was canceled!'); |
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* } else { |
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* console.error('There was an error', error.message); |
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* } |
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* } |
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* } |
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* |
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* foo(ee, 'foo', ac.signal); |
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* ac.abort(); // Abort waiting for the event |
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* ee.emit('foo'); // Prints: Waiting for the event was canceled! |
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* ``` |
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* @since v11.13.0, v10.16.0 |
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*/ |
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static once( |
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emitter: NodeEventTarget, |
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eventName: string | symbol, |
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options?: StaticEventEmitterOptions, |
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): Promise<any[]>; |
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static once(emitter: DOMEventTarget, eventName: string, options?: StaticEventEmitterOptions): Promise<any[]>; |
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/** |
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* ```js |
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* const { on, EventEmitter } = require('events'); |
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* |
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* (async () => { |
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* const ee = new EventEmitter(); |
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* |
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* // Emit later on |
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* process.nextTick(() => { |
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* ee.emit('foo', 'bar'); |
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* ee.emit('foo', 42); |
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* }); |
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* |
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* for await (const event of on(ee, 'foo')) { |
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* // The execution of this inner block is synchronous and it |
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* // processes one event at a time (even with await). Do not use |
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* // if concurrent execution is required. |
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* console.log(event); // prints ['bar'] [42] |
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* } |
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* // Unreachable here |
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* })(); |
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* ``` |
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* |
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* Returns an `AsyncIterator` that iterates `eventName` events. It will throw |
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* if the `EventEmitter` emits `'error'`. It removes all listeners when |
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* exiting the loop. The `value` returned by each iteration is an array |
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* composed of the emitted event arguments. |
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* |
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* An `AbortSignal` can be used to cancel waiting on events: |
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* |
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* ```js |
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* const { on, EventEmitter } = require('events'); |
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* const ac = new AbortController(); |
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* |
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* (async () => { |
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* const ee = new EventEmitter(); |
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* |
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* // Emit later on |
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* process.nextTick(() => { |
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* ee.emit('foo', 'bar'); |
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* ee.emit('foo', 42); |
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* }); |
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* |
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* for await (const event of on(ee, 'foo', { signal: ac.signal })) { |
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* // The execution of this inner block is synchronous and it |
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* // processes one event at a time (even with await). Do not use |
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* // if concurrent execution is required. |
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* console.log(event); // prints ['bar'] [42] |
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* } |
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* // Unreachable here |
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* })(); |
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* |
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* process.nextTick(() => ac.abort()); |
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* ``` |
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* @since v13.6.0, v12.16.0 |
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* @param eventName The name of the event being listened for |
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* @return that iterates `eventName` events emitted by the `emitter` |
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*/ |
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static on( |
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emitter: NodeJS.EventEmitter, |
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eventName: string, |
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options?: StaticEventEmitterOptions, |
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): AsyncIterableIterator<any>; |
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/** |
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* A class method that returns the number of listeners for the given `eventName`registered on the given `emitter`. |
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* |
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* ```js |
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* const { EventEmitter, listenerCount } = require('events'); |
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* const myEmitter = new EventEmitter(); |
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* myEmitter.on('event', () => {}); |
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* myEmitter.on('event', () => {}); |
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* console.log(listenerCount(myEmitter, 'event')); |
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* // Prints: 2 |
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* ``` |
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* @since v0.9.12 |
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* @deprecated Since v3.2.0 - Use `listenerCount` instead. |
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* @param emitter The emitter to query |
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* @param eventName The event name |
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*/ |
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static listenerCount(emitter: NodeJS.EventEmitter, eventName: string | symbol): number; |
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/** |
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* Returns a copy of the array of listeners for the event named `eventName`. |
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* |
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* For `EventEmitter`s this behaves exactly the same as calling `.listeners` on |
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* the emitter. |
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* |
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* For `EventTarget`s this is the only way to get the event listeners for the |
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* event target. This is useful for debugging and diagnostic purposes. |
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* |
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* ```js |
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* const { getEventListeners, EventEmitter } = require('events'); |
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* |
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* { |
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* const ee = new EventEmitter(); |
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* const listener = () => console.log('Events are fun'); |
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* ee.on('foo', listener); |
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* getEventListeners(ee, 'foo'); // [listener] |
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* } |
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* { |
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* const et = new EventTarget(); |
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* const listener = () => console.log('Events are fun'); |
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* et.addEventListener('foo', listener); |
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* getEventListeners(et, 'foo'); // [listener] |
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* } |
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* ``` |
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* @since v15.2.0, v14.17.0 |
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*/ |
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static getEventListeners(emitter: DOMEventTarget | NodeJS.EventEmitter, name: string | symbol): Function[]; |
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/** |
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* By default `EventEmitter`s will print a warning if more than `10` listeners are |
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* added for a particular event. This is a useful default that helps finding |
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* memory leaks. The `EventEmitter.setMaxListeners()` method allows the default limit to be |
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* modified (if eventTargets is empty) or modify the limit specified in every `EventTarget` | `EventEmitter` passed as arguments. |
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* The value can be set to`Infinity` (or `0`) to indicate an unlimited number of listeners. |
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* |
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* ```js |
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* EventEmitter.setMaxListeners(20); |
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* // Equivalent to |
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* EventEmitter.defaultMaxListeners = 20; |
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* |
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* const eventTarget = new EventTarget(); |
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* // Only way to increase limit for `EventTarget` instances |
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* // as these doesn't expose its own `setMaxListeners` method |
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* EventEmitter.setMaxListeners(20, eventTarget); |
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* ``` |
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* @since v15.3.0, v14.17.0 |
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*/ |
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static setMaxListeners(n?: number, ...eventTargets: Array<DOMEventTarget | NodeJS.EventEmitter>): void; |
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/** |
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* This symbol shall be used to install a listener for only monitoring `'error'` |
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* events. Listeners installed using this symbol are called before the regular |
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* `'error'` listeners are called. |
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* |
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* Installing a listener using this symbol does not change the behavior once an |
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* `'error'` event is emitted, therefore the process will still crash if no |
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* regular `'error'` listener is installed. |
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*/ |
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static readonly errorMonitor: unique symbol; |
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static readonly captureRejectionSymbol: unique symbol; |
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/** |
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* Sets or gets the default captureRejection value for all emitters. |
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*/ |
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// TODO: These should be described using static getter/setter pairs: |
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static captureRejections: boolean; |
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static defaultMaxListeners: number; |
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} |
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import internal = require('node:events'); |
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namespace EventEmitter { |
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// Should just be `export { EventEmitter }`, but that doesn't work in TypeScript 3.4 |
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export { internal as EventEmitter }; |
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export interface Abortable { |
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/** |
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* When provided the corresponding `AbortController` can be used to cancel an asynchronous action. |
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*/ |
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signal?: AbortSignal | undefined; |
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} |
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} |
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global { |
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namespace NodeJS { |
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interface EventEmitter { |
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/** |
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* Alias for `emitter.on(eventName, listener)`. |
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* @since v0.1.26 |
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*/ |
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addListener(eventName: string | symbol, listener: (...args: any[]) => void): this; |
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/** |
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* Adds the `listener` function to the end of the listeners array for the |
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* event named `eventName`. No checks are made to see if the `listener` has |
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* already been added. Multiple calls passing the same combination of `eventName`and `listener` will result in the `listener` being added, and called, multiple |
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* times. |
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* |
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* ```js |
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* server.on('connection', (stream) => { |
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* console.log('someone connected!'); |
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* }); |
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* ``` |
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* |
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* Returns a reference to the `EventEmitter`, so that calls can be chained. |
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* |
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* By default, event listeners are invoked in the order they are added. The`emitter.prependListener()` method can be used as an alternative to add the |
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* event listener to the beginning of the listeners array. |
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* |
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* ```js |
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* const myEE = new EventEmitter(); |
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* myEE.on('foo', () => console.log('a')); |
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* myEE.prependListener('foo', () => console.log('b')); |
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* myEE.emit('foo'); |
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* // Prints: |
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* // b |
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* // a |
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* ``` |
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* @since v0.1.101 |
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* @param eventName The name of the event. |
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* @param listener The callback function |
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*/ |
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on(eventName: string | symbol, listener: (...args: any[]) => void): this; |
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/** |
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* Adds a **one-time**`listener` function for the event named `eventName`. The |
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* next time `eventName` is triggered, this listener is removed and then invoked. |
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* |
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* ```js |
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* server.once('connection', (stream) => { |
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* console.log('Ah, we have our first user!'); |
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* }); |
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* ``` |
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* |
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* Returns a reference to the `EventEmitter`, so that calls can be chained. |
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* |
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* By default, event listeners are invoked in the order they are added. The`emitter.prependOnceListener()` method can be used as an alternative to add the |
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* event listener to the beginning of the listeners array. |
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* |
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* ```js |
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* const myEE = new EventEmitter(); |
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* myEE.once('foo', () => console.log('a')); |
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* myEE.prependOnceListener('foo', () => console.log('b')); |
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* myEE.emit('foo'); |
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* // Prints: |
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* // b |
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* // a |
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* ``` |
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* @since v0.3.0 |
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* @param eventName The name of the event. |
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* @param listener The callback function |
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*/ |
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once(eventName: string | symbol, listener: (...args: any[]) => void): this; |
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/** |
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* Removes the specified `listener` from the listener array for the event named`eventName`. |
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* |
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* ```js |
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* const callback = (stream) => { |
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* console.log('someone connected!'); |
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* }; |
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* server.on('connection', callback); |
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* // ... |
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* server.removeListener('connection', callback); |
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* ``` |
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* |
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* `removeListener()` will remove, at most, one instance of a listener from the |
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* listener array. If any single listener has been added multiple times to the |
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* listener array for the specified `eventName`, then `removeListener()` must be |
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* called multiple times to remove each instance. |
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* |
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* Once an event is emitted, all listeners attached to it at the |
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* time of emitting are called in order. This implies that any`removeListener()` or `removeAllListeners()` calls _after_ emitting and_before_ the last listener finishes execution will |
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* not remove them from`emit()` in progress. Subsequent events behave as expected. |
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* |
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* ```js |
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* const myEmitter = new MyEmitter(); |
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* |
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* const callbackA = () => { |
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* console.log('A'); |
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* myEmitter.removeListener('event', callbackB); |
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* }; |
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* |
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* const callbackB = () => { |
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* console.log('B'); |
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* }; |
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* |
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* myEmitter.on('event', callbackA); |
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* |
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* myEmitter.on('event', callbackB); |
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* |
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* // callbackA removes listener callbackB but it will still be called. |
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* // Internal listener array at time of emit [callbackA, callbackB] |
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* myEmitter.emit('event'); |
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* // Prints: |
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* // A |
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* // B |
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* |
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* // callbackB is now removed. |
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* // Internal listener array [callbackA] |
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* myEmitter.emit('event'); |
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* // Prints: |
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* // A |
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* ``` |
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* |
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* Because listeners are managed using an internal array, calling this will |
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* change the position indices of any listener registered _after_ the listener |
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* being removed. This will not impact the order in which listeners are called, |
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* but it means that any copies of the listener array as returned by |
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* the `emitter.listeners()` method will need to be recreated. |
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* |
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* When a single function has been added as a handler multiple times for a single |
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* event (as in the example below), `removeListener()` will remove the most |
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* recently added instance. In the example the `once('ping')`listener is removed: |
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* |
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* ```js |
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* const ee = new EventEmitter(); |
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* |
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* function pong() { |
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* console.log('pong'); |
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* } |
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* |
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* ee.on('ping', pong); |
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* ee.once('ping', pong); |
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* ee.removeListener('ping', pong); |
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* |
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* ee.emit('ping'); |
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* ee.emit('ping'); |
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* ``` |
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* |
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* Returns a reference to the `EventEmitter`, so that calls can be chained. |
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* @since v0.1.26 |
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*/ |
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removeListener(eventName: string | symbol, listener: (...args: any[]) => void): this; |
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/** |
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* Alias for `emitter.removeListener()`. |
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* @since v10.0.0 |
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*/ |
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off(eventName: string | symbol, listener: (...args: any[]) => void): this; |
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/** |
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* Removes all listeners, or those of the specified `eventName`. |
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* |
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* It is bad practice to remove listeners added elsewhere in the code, |
|
* particularly when the `EventEmitter` instance was created by some other |
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* component or module (e.g. sockets or file streams). |
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* |
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* Returns a reference to the `EventEmitter`, so that calls can be chained. |
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* @since v0.1.26 |
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*/ |
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removeAllListeners(event?: string | symbol): this; |
|
/** |
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* By default `EventEmitter`s will print a warning if more than `10` listeners are |
|
* added for a particular event. This is a useful default that helps finding |
|
* memory leaks. The `emitter.setMaxListeners()` method allows the limit to be |
|
* modified for this specific `EventEmitter` instance. The value can be set to`Infinity` (or `0`) to indicate an unlimited number of listeners. |
|
* |
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* Returns a reference to the `EventEmitter`, so that calls can be chained. |
|
* @since v0.3.5 |
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*/ |
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setMaxListeners(n: number): this; |
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/** |
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* Returns the current max listener value for the `EventEmitter` which is either |
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* set by `emitter.setMaxListeners(n)` or defaults to {@link defaultMaxListeners}. |
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* @since v1.0.0 |
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*/ |
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getMaxListeners(): number; |
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/** |
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* Returns a copy of the array of listeners for the event named `eventName`. |
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* |
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* ```js |
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* server.on('connection', (stream) => { |
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* console.log('someone connected!'); |
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* }); |
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* console.log(util.inspect(server.listeners('connection'))); |
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* // Prints: [ [Function] ] |
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* ``` |
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* @since v0.1.26 |
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*/ |
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listeners(eventName: string | symbol): Function[]; |
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/** |
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* Returns a copy of the array of listeners for the event named `eventName`, |
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* including any wrappers (such as those created by `.once()`). |
|
* |
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* ```js |
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* const emitter = new EventEmitter(); |
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* emitter.once('log', () => console.log('log once')); |
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* |
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* // Returns a new Array with a function `onceWrapper` which has a property |
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* // `listener` which contains the original listener bound above |
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* const listeners = emitter.rawListeners('log'); |
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* const logFnWrapper = listeners[0]; |
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* |
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* // Logs "log once" to the console and does not unbind the `once` event |
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* logFnWrapper.listener(); |
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* |
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* // Logs "log once" to the console and removes the listener |
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* logFnWrapper(); |
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* |
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* emitter.on('log', () => console.log('log persistently')); |
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* // Will return a new Array with a single function bound by `.on()` above |
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* const newListeners = emitter.rawListeners('log'); |
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* |
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* // Logs "log persistently" twice |
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* newListeners[0](); |
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* emitter.emit('log'); |
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* ``` |
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* @since v9.4.0 |
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*/ |
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rawListeners(eventName: string | symbol): Function[]; |
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/** |
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* Synchronously calls each of the listeners registered for the event named`eventName`, in the order they were registered, passing the supplied arguments |
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* to each. |
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* |
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* Returns `true` if the event had listeners, `false` otherwise. |
|
* |
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* ```js |
|
* const EventEmitter = require('events'); |
|
* const myEmitter = new EventEmitter(); |
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* |
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* // First listener |
|
* myEmitter.on('event', function firstListener() { |
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* console.log('Helloooo! first listener'); |
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* }); |
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* // Second listener |
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* myEmitter.on('event', function secondListener(arg1, arg2) { |
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* console.log(`event with parameters ${arg1}, ${arg2} in second listener`); |
|
* }); |
|
* // Third listener |
|
* myEmitter.on('event', function thirdListener(...args) { |
|
* const parameters = args.join(', '); |
|
* console.log(`event with parameters ${parameters} in third listener`); |
|
* }); |
|
* |
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* console.log(myEmitter.listeners('event')); |
|
* |
|
* myEmitter.emit('event', 1, 2, 3, 4, 5); |
|
* |
|
* // Prints: |
|
* // [ |
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* // [Function: firstListener], |
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* // [Function: secondListener], |
|
* // [Function: thirdListener] |
|
* // ] |
|
* // Helloooo! first listener |
|
* // event with parameters 1, 2 in second listener |
|
* // event with parameters 1, 2, 3, 4, 5 in third listener |
|
* ``` |
|
* @since v0.1.26 |
|
*/ |
|
emit(eventName: string | symbol, ...args: any[]): boolean; |
|
/** |
|
* Returns the number of listeners listening to the event named `eventName`. |
|
* @since v3.2.0 |
|
* @param eventName The name of the event being listened for |
|
*/ |
|
listenerCount(eventName: string | symbol): number; |
|
/** |
|
* Adds the `listener` function to the _beginning_ of the listeners array for the |
|
* event named `eventName`. No checks are made to see if the `listener` has |
|
* already been added. Multiple calls passing the same combination of `eventName`and `listener` will result in the `listener` being added, and called, multiple |
|
* times. |
|
* |
|
* ```js |
|
* server.prependListener('connection', (stream) => { |
|
* console.log('someone connected!'); |
|
* }); |
|
* ``` |
|
* |
|
* Returns a reference to the `EventEmitter`, so that calls can be chained. |
|
* @since v6.0.0 |
|
* @param eventName The name of the event. |
|
* @param listener The callback function |
|
*/ |
|
prependListener(eventName: string | symbol, listener: (...args: any[]) => void): this; |
|
/** |
|
* Adds a **one-time**`listener` function for the event named `eventName` to the_beginning_ of the listeners array. The next time `eventName` is triggered, this |
|
* listener is removed, and then invoked. |
|
* |
|
* ```js |
|
* server.prependOnceListener('connection', (stream) => { |
|
* console.log('Ah, we have our first user!'); |
|
* }); |
|
* ``` |
|
* |
|
* Returns a reference to the `EventEmitter`, so that calls can be chained. |
|
* @since v6.0.0 |
|
* @param eventName The name of the event. |
|
* @param listener The callback function |
|
*/ |
|
prependOnceListener(eventName: string | symbol, listener: (...args: any[]) => void): this; |
|
/** |
|
* Returns an array listing the events for which the emitter has registered |
|
* listeners. The values in the array are strings or `Symbol`s. |
|
* |
|
* ```js |
|
* const EventEmitter = require('events'); |
|
* const myEE = new EventEmitter(); |
|
* myEE.on('foo', () => {}); |
|
* myEE.on('bar', () => {}); |
|
* |
|
* const sym = Symbol('symbol'); |
|
* myEE.on(sym, () => {}); |
|
* |
|
* console.log(myEE.eventNames()); |
|
* // Prints: [ 'foo', 'bar', Symbol(symbol) ] |
|
* ``` |
|
* @since v6.0.0 |
|
*/ |
|
eventNames(): Array<string | symbol>; |
|
} |
|
} |
|
} |
|
export = EventEmitter; |
|
} |
|
declare module 'node:events' { |
|
import events = require('events'); |
|
export = events; |
|
}
|
|
|