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/var/www/qr4y.gr/server/delivery/node_modules/@types/node/events.d.ts
(29065B)
/** * Much of the Node.js core API is built around an idiomatic asynchronous * event-driven architecture in which certain kinds of objects (called "emitters") * emit named events that cause `Function` objects ("listeners") to be called. * * For instance: a `net.Server` object emits an event each time a peer * connects to it; a `fs.ReadStream` emits an event when the file is opened; * a `stream` emits an event whenever data is available to be read. * * All objects that emit events are instances of the `EventEmitter` class. These * objects expose an `eventEmitter.on()` function that allows one or more * functions to be attached to named events emitted by the object. Typically, * event names are camel-cased strings but any valid JavaScript property key * can be used. * * When the `EventEmitter` object emits an event, all of the functions attached * to that specific event are called _synchronously_. Any values returned by the * called listeners are _ignored_ and discarded. * * The following example shows a simple `EventEmitter` instance with a single * listener. The `eventEmitter.on()` method is used to register listeners, while * the `eventEmitter.emit()` method is used to trigger the event. * * ```js * const EventEmitter = require('events'); * * class MyEmitter extends EventEmitter {} * * const myEmitter = new MyEmitter(); * myEmitter.on('event', () => { * console.log('an event occurred!'); * }); * myEmitter.emit('event'); * ``` * @see [source](https://github.com/nodejs/node/blob/v17.0.0/lib/events.js) */ declare module 'events' { interface EventEmitterOptions { /** * Enables automatic capturing of promise rejection. */ captureRejections?: boolean | undefined; } interface NodeEventTarget { once(eventName: string | symbol, listener: (...args: any[]) => void): this; } interface DOMEventTarget { addEventListener( eventName: string, listener: (...args: any[]) => void, opts?: { once: boolean; }, ): any; } interface StaticEventEmitterOptions { signal?: AbortSignal | undefined; } interface EventEmitter extends NodeJS.EventEmitter {} /** * The `EventEmitter` class is defined and exposed by the `events` module: * * ```js * const EventEmitter = require('events'); * ``` * * All `EventEmitter`s emit the event `'newListener'` when new listeners are * added and `'removeListener'` when existing listeners are removed. * * It supports the following option: * @since v0.1.26 */ class EventEmitter { constructor(options?: EventEmitterOptions); /** * Creates a `Promise` that is fulfilled when the `EventEmitter` emits the given * event or that is rejected if the `EventEmitter` emits `'error'` while waiting. * The `Promise` will resolve with an array of all the arguments emitted to the * given event. * * 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 * semantics and does not listen to the `'error'` event. * * ```js * const { once, EventEmitter } = require('events'); * * async function run() { * const ee = new EventEmitter(); * * process.nextTick(() => { * ee.emit('myevent', 42); * }); * * const [value] = await once(ee, 'myevent'); * console.log(value); * * const err = new Error('kaboom'); * process.nextTick(() => { * ee.emit('error', err); * }); * * try { * await once(ee, 'myevent'); * } catch (err) { * console.log('error happened', err); * } * } * * run(); * ``` * * 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 * '`error'` event itself, then it is treated as any other kind of event without * special handling: * * ```js * const { EventEmitter, once } = require('events'); * * const ee = new EventEmitter(); * * once(ee, 'error') * .then(([err]) => console.log('ok', err.message)) * .catch((err) => console.log('error', err.message)); * * ee.emit('error', new Error('boom')); * * // Prints: ok boom * ``` * * An `AbortSignal` can be used to cancel waiting for the event: * * ```js * const { EventEmitter, once } = require('events'); * * const ee = new EventEmitter(); * const ac = new AbortController(); * * async function foo(emitter, event, signal) { * try { * await once(emitter, event, { signal }); * console.log('event emitted!'); * } catch (error) { * if (error.name === 'AbortError') { * console.error('Waiting for the event was canceled!'); * } else { * console.error('There was an error', error.message); * } * } * } * * foo(ee, 'foo', ac.signal); * ac.abort(); // Abort waiting for the event * ee.emit('foo'); // Prints: Waiting for the event was canceled! * ``` * @since v11.13.0, v10.16.0 */ static once( emitter: NodeEventTarget, eventName: string | symbol, options?: StaticEventEmitterOptions, ): Promise<any[]>; static once(emitter: DOMEventTarget, eventName: string, options?: StaticEventEmitterOptions): Promise<any[]>; /** * ```js * const { on, EventEmitter } = require('events'); * * (async () => { * const ee = new EventEmitter(); * * // Emit later on * process.nextTick(() => { * ee.emit('foo', 'bar'); * ee.emit('foo', 42); * }); * * for await (const event of on(ee, 'foo')) { * // The execution of this inner block is synchronous and it * // processes one event at a time (even with await). Do not use * // if concurrent execution is required. * console.log(event); // prints ['bar'] [42] * } * // Unreachable here * })(); * ``` * * Returns an `AsyncIterator` that iterates `eventName` events. It will throw * if the `EventEmitter` emits `'error'`. It removes all listeners when * exiting the loop. The `value` returned by each iteration is an array * composed of the emitted event arguments. * * An `AbortSignal` can be used to cancel waiting on events: * * ```js * const { on, EventEmitter } = require('events'); * const ac = new AbortController(); * * (async () => { * const ee = new EventEmitter(); * * // Emit later on * process.nextTick(() => { * ee.emit('foo', 'bar'); * ee.emit('foo', 42); * }); * * for await (const event of on(ee, 'foo', { signal: ac.signal })) { * // The execution of this inner block is synchronous and it * // processes one event at a time (even with await). Do not use * // if concurrent execution is required. * console.log(event); // prints ['bar'] [42] * } * // Unreachable here * })(); * * process.nextTick(() => ac.abort()); * ``` * @since v13.6.0, v12.16.0 * @param eventName The name of the event being listened for * @return that iterates `eventName` events emitted by the `emitter` */ static on( emitter: NodeJS.EventEmitter, eventName: string, options?: StaticEventEmitterOptions, ): AsyncIterableIterator<any>; /** * A class method that returns the number of listeners for the given `eventName`registered on the given `emitter`. * * ```js * const { EventEmitter, listenerCount } = require('events'); * const myEmitter = new EventEmitter(); * myEmitter.on('event', () => {}); * myEmitter.on('event', () => {}); * console.log(listenerCount(myEmitter, 'event')); * // Prints: 2 * ``` * @since v0.9.12 * @deprecated Since v3.2.0 - Use `listenerCount` instead. * @param emitter The emitter to query * @param eventName The event name */ static listenerCount(emitter: NodeJS.EventEmitter, eventName: string | symbol): number; /** * Returns a copy of the array of listeners for the event named `eventName`. * * For `EventEmitter`s this behaves exactly the same as calling `.listeners` on * the emitter. * * For `EventTarget`s this is the only way to get the event listeners for the * event target. This is useful for debugging and diagnostic purposes. * * ```js * const { getEventListeners, EventEmitter } = require('events'); * * { * const ee = new EventEmitter(); * const listener = () => console.log('Events are fun'); * ee.on('foo', listener); * getEventListeners(ee, 'foo'); // [listener] * } * { * const et = new EventTarget(); * const listener = () => console.log('Events are fun'); * et.addEventListener('foo', listener); * getEventListeners(et, 'foo'); // [listener] * } * ``` * @since v15.2.0, v14.17.0 */ static getEventListeners(emitter: DOMEventTarget | NodeJS.EventEmitter, name: string | symbol): Function[]; /** * 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 `EventEmitter.setMaxListeners()` method allows the default limit to be * modified (if eventTargets is empty) or modify the limit specified in every `EventTarget` | `EventEmitter` passed as arguments. * The value can be set to`Infinity` (or `0`) to indicate an unlimited number of listeners. * * ```js * EventEmitter.setMaxListeners(20); * // Equivalent to * EventEmitter.defaultMaxListeners = 20; * * const eventTarget = new EventTarget(); * // Only way to increase limit for `EventTarget` instances * // as these doesn't expose its own `setMaxListeners` method * EventEmitter.setMaxListeners(20, eventTarget); * ``` * @since v15.3.0, v14.17.0 */ static setMaxListeners(n?: number, ...eventTargets: Array<DOMEventTarget | NodeJS.EventEmitter>): void; /** * This symbol shall be used to install a listener for only monitoring `'error'` * events. Listeners installed using this symbol are called before the regular * `'error'` listeners are called. * * Installing a listener using this symbol does not change the behavior once an * `'error'` event is emitted, therefore the process will still crash if no * regular `'error'` listener is installed. */ static readonly errorMonitor: unique symbol; static readonly captureRejectionSymbol: unique symbol; /** * Sets or gets the default captureRejection value for all emitters. */ // TODO: These should be described using static getter/setter pairs: static captureRejections: boolean; static defaultMaxListeners: number; } import internal = require('node:events'); namespace EventEmitter { // Should just be `export { EventEmitter }`, but that doesn't work in TypeScript 3.4 export { internal as EventEmitter }; export interface Abortable { /** * When provided the corresponding `AbortController` can be used to cancel an asynchronous action. */ signal?: AbortSignal | undefined; } } global { namespace NodeJS { interface EventEmitter { /** * Alias for `emitter.on(eventName, listener)`. * @since v0.1.26 */ addListener(eventName: string | symbol, listener: (...args: any[]) => void): this; /** * Adds the `listener` function to the end 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.on('connection', (stream) => { * console.log('someone connected!'); * }); * ``` * * Returns a reference to the `EventEmitter`, so that calls can be chained. * * 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 * event listener to the beginning of the listeners array. * * ```js * const myEE = new EventEmitter(); * myEE.on('foo', () => console.log('a')); * myEE.prependListener('foo', () => console.log('b')); * myEE.emit('foo'); * // Prints: * // b * // a * ``` * @since v0.1.101 * @param eventName The name of the event. * @param listener The callback function */ on(eventName: string | symbol, listener: (...args: any[]) => void): this; /** * Adds a **one-time**`listener` function for the event named `eventName`. The * next time `eventName` is triggered, this listener is removed and then invoked. * * ```js * server.once('connection', (stream) => { * console.log('Ah, we have our first user!'); * }); * ``` * * Returns a reference to the `EventEmitter`, so that calls can be chained. * * 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 * event listener to the beginning of the listeners array. * * ```js * const myEE = new EventEmitter(); * myEE.once('foo', () => console.log('a')); * myEE.prependOnceListener('foo', () => console.log('b')); * myEE.emit('foo'); * // Prints: * // b * // a * ``` * @since v0.3.0 * @param eventName The name of the event. * @param listener The callback function */ once(eventName: string | symbol, listener: (...args: any[]) => void): this; /** * Removes the specified `listener` from the listener array for the event named`eventName`. * * ```js * const callback = (stream) => { * console.log('someone connected!'); * }; * server.on('connection', callback); * // ... * server.removeListener('connection', callback); * ``` * * `removeListener()` will remove, at most, one instance of a listener from the * listener array. If any single listener has been added multiple times to the * listener array for the specified `eventName`, then `removeListener()` must be * called multiple times to remove each instance. * * Once an event is emitted, all listeners attached to it at the * 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 * not remove them from`emit()` in progress. Subsequent events behave as expected. * * ```js * const myEmitter = new MyEmitter(); * * const callbackA = () => { * console.log('A'); * myEmitter.removeListener('event', callbackB); * }; * * const callbackB = () => { * console.log('B'); * }; * * myEmitter.on('event', callbackA); * * myEmitter.on('event', callbackB); * * // callbackA removes listener callbackB but it will still be called. * // Internal listener array at time of emit [callbackA, callbackB] * myEmitter.emit('event'); * // Prints: * // A * // B * * // callbackB is now removed. * // Internal listener array [callbackA] * myEmitter.emit('event'); * // Prints: * // A * ``` * * Because listeners are managed using an internal array, calling this will * change the position indices of any listener registered _after_ the listener * being removed. This will not impact the order in which listeners are called, * but it means that any copies of the listener array as returned by * the `emitter.listeners()` method will need to be recreated. * * When a single function has been added as a handler multiple times for a single * event (as in the example below), `removeListener()` will remove the most * recently added instance. In the example the `once('ping')`listener is removed: * * ```js * const ee = new EventEmitter(); * * function pong() { * console.log('pong'); * } * * ee.on('ping', pong); * ee.once('ping', pong); * ee.removeListener('ping', pong); * * ee.emit('ping'); * ee.emit('ping'); * ``` * * Returns a reference to the `EventEmitter`, so that calls can be chained. * @since v0.1.26 */ removeListener(eventName: string | symbol, listener: (...args: any[]) => void): this; /** * Alias for `emitter.removeListener()`. * @since v10.0.0 */ off(eventName: string | symbol, listener: (...args: any[]) => void): this; /** * Removes all listeners, or those of the specified `eventName`. * * It is bad practice to remove listeners added elsewhere in the code, * particularly when the `EventEmitter` instance was created by some other * component or module (e.g. sockets or file streams). * * Returns a reference to the `EventEmitter`, so that calls can be chained. * @since v0.1.26 */ removeAllListeners(event?: string | symbol): this; /** * 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. * * Returns a reference to the `EventEmitter`, so that calls can be chained. * @since v0.3.5 */ setMaxListeners(n: number): this; /** * Returns the current max listener value for the `EventEmitter` which is either * set by `emitter.setMaxListeners(n)` or defaults to {@link defaultMaxListeners}. * @since v1.0.0 */ getMaxListeners(): number; /** * Returns a copy of the array of listeners for the event named `eventName`. * * ```js * server.on('connection', (stream) => { * console.log('someone connected!'); * }); * console.log(util.inspect(server.listeners('connection'))); * // Prints: [ [Function] ] * ``` * @since v0.1.26 */ listeners(eventName: string | symbol): Function[]; /** * Returns a copy of the array of listeners for the event named `eventName`, * including any wrappers (such as those created by `.once()`). * * ```js * const emitter = new EventEmitter(); * emitter.once('log', () => console.log('log once')); * * // Returns a new Array with a function `onceWrapper` which has a property * // `listener` which contains the original listener bound above * const listeners = emitter.rawListeners('log'); * const logFnWrapper = listeners[0]; * * // Logs "log once" to the console and does not unbind the `once` event * logFnWrapper.listener(); * * // Logs "log once" to the console and removes the listener * logFnWrapper(); * * emitter.on('log', () => console.log('log persistently')); * // Will return a new Array with a single function bound by `.on()` above * const newListeners = emitter.rawListeners('log'); * * // Logs "log persistently" twice * newListeners[0](); * emitter.emit('log'); * ``` * @since v9.4.0 */ rawListeners(eventName: string | symbol): Function[]; /** * Synchronously calls each of the listeners registered for the event named`eventName`, in the order they were registered, passing the supplied arguments * to each. * * Returns `true` if the event had listeners, `false` otherwise. * * ```js * const EventEmitter = require('events'); * const myEmitter = new EventEmitter(); * * // First listener * myEmitter.on('event', function firstListener() { * console.log('Helloooo! first listener'); * }); * // Second listener * myEmitter.on('event', function secondListener(arg1, arg2) { * 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`); * }); * * console.log(myEmitter.listeners('event')); * * myEmitter.emit('event', 1, 2, 3, 4, 5); * * // Prints: * // [ * // [Function: firstListener], * // [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; }
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