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@webda/core • Readme | API

Class: GlobalContext

OperationContext is used when call to an operation

Extends​

Constructors​

new GlobalContext(webda)​

new GlobalContext(webda): GlobalContext

Parameters​

• webda: Core<CoreEvents>

Returns​

GlobalContext

Overrides​

OperationContext.constructor

Source​

packages/core/src/utils/context.ts:394

Properties​

_body​

protected _body: string

Output

Inherited from​

OperationContext._body

Source​

packages/core/src/utils/context.ts:87

_promises​

_promises: Promise<any>[]

Contain all registered promises to this context

Inherited from​

OperationContext._promises

Source​

packages/core/src/utils/context.ts:98

_sanitized​

protected _sanitized: any

Contain the sanitized request body if computed

Inherited from​

OperationContext._sanitized

Source​

packages/core/src/utils/context.ts:82

_stream​

_stream: Writable

Output stream

Inherited from​

OperationContext._stream

Source​

packages/core/src/utils/context.ts:120

_webda​

protected _webda: Core<CoreEvents>

Contain emitting Core

Inherited from​

OperationContext._webda

Source​

packages/core/src/utils/context.ts:70

extensions​

protected extensions: Object

Allow extensions

Index signature​

[key: string]: any

Inherited from​

OperationContext.extensions

Source​

packages/core/src/utils/context.ts:78

session​

session: Session

Session

Overrides​

OperationContext.session

Source​

packages/core/src/utils/context.ts:392

__globalContext​

static protected __globalContext: OperationContext<any, any>

Inherited from​

OperationContext.__globalContext

Source​

packages/core/src/utils/context.ts:65

captureRejectionSymbol​

static readonly captureRejectionSymbol: typeof captureRejectionSymbol

Inherited from​

OperationContext.captureRejectionSymbol

Source​

packages/core/node_modules/@types/node/events.d.ts:328

captureRejections​

static captureRejections: boolean

Sets or gets the default captureRejection value for all emitters.

Inherited from​

OperationContext.captureRejections

Source​

packages/core/node_modules/@types/node/events.d.ts:333

defaultMaxListeners​

static defaultMaxListeners: number

Inherited from​

OperationContext.defaultMaxListeners

Source​

packages/core/node_modules/@types/node/events.d.ts:334

errorMonitor​

static readonly errorMonitor: typeof errorMonitor

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.

Inherited from​

OperationContext.errorMonitor

Source​

packages/core/node_modules/@types/node/events.d.ts:327

Methods​

addAsyncRequest()​

addAsyncRequest(promise): void

Register a promise with the context

Parameters​

• promise: any

Returns​

void

Inherited from​

OperationContext.addAsyncRequest

Source​

packages/core/src/utils/context.ts:167

addListener()​

addListener(eventName, listener): this

Alias for emitter.on(eventName, listener).

Parameters​

• eventName: string | symbol

• listener: (...args) => void

Returns​

this

Inherited from​

OperationContext.addListener

Since​

v0.1.26

Source​

packages/core/node_modules/@types/node/events.d.ts:354

createStream()​

createStream(): void

Create a buffer stream

Returns​

void

Inherited from​

OperationContext.createStream

Source​

packages/core/src/utils/context.ts:296

emit()​

emit(eventName, ...args): boolean

Synchronously calls each of the listeners registered for the event namedeventName, in the order they were registered, passing the supplied arguments to each.

Returns true if the event had listeners, false otherwise.

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

Parameters​

• eventName: string | symbol

• ...args: any[]

Returns​

boolean

Inherited from​

OperationContext.emit

Since​

v0.1.26

Source​

packages/core/node_modules/@types/node/events.d.ts:610

end()​

end(): Promise<void>

Ensure the whole execution is finished

Returns​

Promise<void>

Inherited from​

OperationContext.end

Source​

packages/core/src/utils/context.ts:192

eventNames()​

eventNames(): (string | symbol)[]

Returns an array listing the events for which the emitter has registered listeners. The values in the array are strings or Symbols.

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) ]

Returns​

(string | symbol)[]

Inherited from​

OperationContext.eventNames

Since​

v6.0.0

Source​

packages/core/node_modules/@types/node/events.d.ts:669

getCurrentUser()​

getCurrentUser<K>(refresh): Promise<K>

Get the current user from session

Type parameters​

• K extends User

Parameters​

• refresh: boolean= false

Returns​

Promise<K>

Inherited from​

OperationContext.getCurrentUser

Source​

packages/core/src/utils/context.ts:361

getCurrentUserId()​

getCurrentUserId(): any

Get the current user id from session

Returns​

any

Inherited from​

OperationContext.getCurrentUserId

Source​

packages/core/src/utils/context.ts:375

getExtension()​

getExtension<K>(name): K

Get an extension of the context

Type parameters​

• K = any

Parameters​

• name: string

of the extension

Returns​

K

extension object

Inherited from​

OperationContext.getExtension

Source​

packages/core/src/utils/context.ts:126

getHttpContext()​

getHttpContext(): HttpContext

Get current http context

Returns​

HttpContext

Inherited from​

OperationContext.getHttpContext

Source​

packages/core/src/utils/context.ts:185

getInput()​

getInput(sanitizedOptions): Promise<any>

Parameters​

• sanitizedOptions: IOptions & Object= undefined

Returns​

Promise<any>

Inherited from​

OperationContext.getInput

Source​

packages/core/src/utils/context.ts:198

getMaxListeners()​

getMaxListeners(): number

Returns the current max listener value for the EventEmitter which is either set by emitter.setMaxListeners(n) or defaults to defaultMaxListeners.

Returns​

number

Inherited from​

OperationContext.getMaxListeners

Since​

v1.0.0

Source​

packages/core/node_modules/@types/node/events.d.ts:526

getOutput()​

getOutput(): string

Get output as string, if a OutputStream is provided it will returned null

Returns​

string

Inherited from​

OperationContext.getOutput

Source​

packages/core/src/utils/context.ts:175

getOutputStream()​

getOutputStream(): Writable

Get the HTTP stream to output raw data

Returns​

Writable

Inherited from​

OperationContext.getOutputStream

Source​

packages/core/src/utils/context.ts:271

getRawInput()​

getRawInput(_limit, _timeout): Promise<Buffer>

Parameters​

• _limit: number= undefined

• _timeout: number= 60000

Returns​

Promise<Buffer>

Inherited from​

OperationContext.getRawInput

Source​

packages/core/src/utils/context.ts:256

getRawInputAsString()​

getRawInputAsString(limit, timeout, encoding?): Promise<string>

By default empty

Parameters​

• limit: number= undefined

• timeout: number= 60000

• encoding?: BufferEncoding

Returns​

Promise<string>

Inherited from​

OperationContext.getRawInputAsString

Source​

packages/core/src/utils/context.ts:245

getRawStream()​

getRawStream(): Readable

Returns​

Readable

Inherited from​

OperationContext.getRawStream

Source​

packages/core/src/utils/context.ts:263

getSession()​

getSession<K>(): K

Get linked session

Type parameters​

• K = Session

Returns​

K

Inherited from​

OperationContext.getSession

Source​

packages/core/src/utils/context.ts:279

getWebda()​

getWebda(): Core<CoreEvents>

Return the webda

Returns​

Core<CoreEvents>

Inherited from​

OperationContext.getWebda

Source​

packages/core/src/utils/context.ts:159

init()​

init(): Promise<GlobalContext>

Returns​

Promise<GlobalContext>

Inherited from​

OperationContext.init

Source​

packages/core/src/utils/context.ts:354

isGlobal()​

isGlobal(): boolean

Returns​

boolean

Overrides​

OperationContext.isGlobal

Source​

packages/core/src/utils/context.ts:404

listenerCount()​

listenerCount(eventName): number

Returns the number of listeners listening to the event named eventName.

Parameters​

• eventName: string | symbol

The name of the event being listened for

Returns​

number

Inherited from​

OperationContext.listenerCount

Since​

v3.2.0

Source​

packages/core/node_modules/@types/node/events.d.ts:616

listeners()​

listeners(eventName): Function[]

Returns a copy of the array of listeners for the event named eventName.

server.on('connection', (stream) => {
  console.log('someone connected!');
});
console.log(util.inspect(server.listeners('connection')));
// Prints: [ [Function] ]

Parameters​

• eventName: string | symbol

Returns​

Function[]

Inherited from​

OperationContext.listeners

Since​

v0.1.26

Source​

packages/core/node_modules/@types/node/events.d.ts:539

log()​

log(level, ...args): void

Proxy for simplification

Parameters​

• level: WorkerLogLevel

• ...args: any[]

Returns​

void

Inherited from​

OperationContext.log

Source​

packages/core/src/utils/context.ts:308

newSession()​

newSession(): Promise<Session>

Create a new session

Returns​

Promise<Session>

Inherited from​

OperationContext.newSession

Source​

packages/core/src/utils/context.ts:316

off()​

off(eventName, listener): this

Alias for emitter.removeListener().

Parameters​

• eventName: string | symbol

• listener: (...args) => void

Returns​

this

Inherited from​

OperationContext.off

Since​

v10.0.0

Source​

packages/core/node_modules/@types/node/events.d.ts:499

on()​

on(eventName, listener): 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 eventNameand listener will result in the listener being added, and called, multiple times.

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. Theemitter.prependListener() method can be used as an alternative to add the event listener to the beginning of the listeners array.

const myEE = new EventEmitter();
myEE.on('foo', () => console.log('a'));
myEE.prependListener('foo', () => console.log('b'));
myEE.emit('foo');
// Prints:
//   b
//   a

Parameters​

• eventName: string | symbol

The name of the event.

• listener: (...args) => void

The callback function

Returns​

this

Inherited from​

OperationContext.on

Since​

v0.1.101

Source​

packages/core/node_modules/@types/node/events.d.ts:385

once()​

once(eventName, listener): this

Adds a one-timelistener function for the event named eventName. The next time eventName is triggered, this listener is removed and then invoked.

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. Theemitter.prependOnceListener() method can be used as an alternative to add the event listener to the beginning of the listeners array.

const myEE = new EventEmitter();
myEE.once('foo', () => console.log('a'));
myEE.prependOnceListener('foo', () => console.log('b'));
myEE.emit('foo');
// Prints:
//   b
//   a

Parameters​

• eventName: string | symbol

The name of the event.

• listener: (...args) => void

The callback function

Returns​

this

Inherited from​

OperationContext.once

Since​

v0.3.0

Source​

packages/core/node_modules/@types/node/events.d.ts:414

prependListener()​

prependListener(eventName, listener): this

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 eventNameand listener will result in the listener being added, and called, multiple times.

server.prependListener('connection', (stream) => {
  console.log('someone connected!');
});

Returns a reference to the EventEmitter, so that calls can be chained.

Parameters​

• eventName: string | symbol

The name of the event.

• listener: (...args) => void

The callback function

Returns​

this

Inherited from​

OperationContext.prependListener

Since​

v6.0.0

Source​

packages/core/node_modules/@types/node/events.d.ts:634

prependOnceListener()​

prependOnceListener(eventName, listener): this

Adds a one-timelistener 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.

server.prependOnceListener('connection', (stream) => {
  console.log('Ah, we have our first user!');
});

Returns a reference to the EventEmitter, so that calls can be chained.

Parameters​

• eventName: string | symbol

The name of the event.

• listener: (...args) => void

The callback function

Returns​

this

Inherited from​

OperationContext.prependOnceListener

Since​

v6.0.0

Source​

packages/core/node_modules/@types/node/events.d.ts:650

rawListeners()​

rawListeners(eventName): Function[]

Returns a copy of the array of listeners for the event named eventName, including any wrappers (such as those created by .once()).

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');

Parameters​

• eventName: string | symbol

Returns​

Function[]

Inherited from​

OperationContext.rawListeners

Since​

v9.4.0

Source​

packages/core/node_modules/@types/node/events.d.ts:569

reinit()​

reinit(): void

Remove sanitized body

Returns​

void

Inherited from​

OperationContext.reinit

Source​

packages/core/src/utils/context.ts:286

removeAllListeners()​

removeAllListeners(event?): 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.

Parameters​

• event?: string | symbol

Returns​

this

Inherited from​

OperationContext.removeAllListeners

Since​

v0.1.26

Source​

packages/core/node_modules/@types/node/events.d.ts:510

removeListener()​

removeListener(eventName, listener): this

Removes the specified listener from the listener array for the event namedeventName.

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 anyremoveListener() or removeAllListeners() calls after emitting and before the last listener finishes execution will not remove them fromemit() in progress. Subsequent events behave as expected.

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:

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.

Parameters​

• eventName: string | symbol

• listener: (...args) => void

Returns​

this

Inherited from​

OperationContext.removeListener

Since​

v0.1.26

Source​

packages/core/node_modules/@types/node/events.d.ts:494

resetResponse()​

resetResponse(): void

Remove everything that was about to be sent

Returns​

void

Inherited from​

OperationContext.resetResponse

Source​

packages/core/src/utils/context.ts:324

setExtension()​

setExtension(name, extension): this

Parameters​

• name: string

to add

• extension: any

object to store

Returns​

this

Inherited from​

OperationContext.setExtension

Source​

packages/core/src/utils/context.ts:151

setHeader()​

setHeader(_name, _value): void

For easier compatibility with WebContext On OperationContext this call is simply ignored

Parameters​

• _name: string

• _value: string

Returns​

void

Inherited from​

OperationContext.setHeader

Source​

packages/core/src/utils/context.ts:134

setMaxListeners()​

setMaxListeners(n): this

By default EventEmitters 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 toInfinity (or 0) to indicate an unlimited number of listeners.

Returns a reference to the EventEmitter, so that calls can be chained.

Parameters​

• n: number

Returns​

this

Inherited from​

OperationContext.setMaxListeners

Since​

v0.3.5

Source​

packages/core/node_modules/@types/node/events.d.ts:520

write()​

write(output, _encoding?, _cb?): boolean

Write data to the client

Parameters​

• output: any

If it is an object it will be serialized with toPublicJSON, if it is a String it will be appended to the result, if it is a buffer it will replace the result

• _encoding?: string

• _cb?: (error) => void

Returns​

boolean

Inherited from​

OperationContext.write

Source​

packages/core/src/utils/context.ts:337

writeHead()​

writeHead(_code, _headers): void

For easier compatibility with WebContext On OperationContext this call is simply ignored

Parameters​

• _code: number

• _headers: any

Returns​

void

Inherited from​

OperationContext.writeHead

Source​

packages/core/src/utils/context.ts:142

getEventListeners()​

static getEventListeners(emitter, name): Function[]

Returns a copy of the array of listeners for the event named eventName.

For EventEmitters this behaves exactly the same as calling .listeners on the emitter.

For EventTargets this is the only way to get the event listeners for the event target. This is useful for debugging and diagnostic purposes.

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]
}

Parameters​

• emitter: EventEmitter | _DOMEventTarget

• name: string | symbol

Returns​

Function[]

Inherited from​

OperationContext.getEventListeners

Since​

v15.2.0, v14.17.0

Source​

packages/core/node_modules/@types/node/events.d.ts:299

listenerCount()​

static listenerCount(emitter, eventName): number

A class method that returns the number of listeners for the given eventNameregistered on the given emitter.

const { EventEmitter, listenerCount } = require('events');
const myEmitter = new EventEmitter();
myEmitter.on('event', () => {});
myEmitter.on('event', () => {});
console.log(listenerCount(myEmitter, 'event'));
// Prints: 2

Parameters​

• emitter: EventEmitter

The emitter to query

• eventName: string | symbol

The event name

Returns​

number

Inherited from​

OperationContext.listenerCount

Since​

v0.9.12

Deprecated​

Since v3.2.0 - Use listenerCount instead.

Source​

packages/core/node_modules/@types/node/events.d.ts:271

on()​

static on(emitter, eventName, options?): AsyncIterableIterator<any>

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:

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());

Parameters​

• emitter: EventEmitter

• eventName: string

The name of the event being listened for

• options?: StaticEventEmitterOptions

Returns​

AsyncIterableIterator<any>

that iterates eventName events emitted by the emitter

Inherited from​

OperationContext.on

Since​

v13.6.0, v12.16.0

Source​

packages/core/node_modules/@types/node/events.d.ts:254

once()​

once(emitter, eventName, options)​

static once(emitter, eventName, options?): Promise<any[]>

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 interface, which has no special'error' event semantics and does not listen to the 'error' event.

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:

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:

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!
Parameters​

• emitter: _NodeEventTarget

• eventName: string | symbol

• options?: StaticEventEmitterOptions

Returns​

Promise<any[]>

Inherited from​

OperationContext.once

Since​

v11.13.0, v10.16.0

Source​

packages/core/node_modules/@types/node/events.d.ts:194

once(emitter, eventName, options)​

static once(emitter, eventName, options?): Promise<any[]>

Parameters​

• emitter: _DOMEventTarget

• eventName: string

• options?: StaticEventEmitterOptions

Returns​

Promise<any[]>

Inherited from​

OperationContext.once

Source​

packages/core/node_modules/@types/node/events.d.ts:195

setMaxListeners()​

static setMaxListeners(n?, ...eventTargets?): void

const {
  setMaxListeners,
  EventEmitter
} = require('events');

const target = new EventTarget();
const emitter = new EventEmitter();

setMaxListeners(5, target, emitter);

Parameters​

• n?: number

A non-negative number. The maximum number of listeners per EventTarget event.

• ...eventTargets?: (EventEmitter | _DOMEventTarget)[]

Returns​

void

Inherited from​

OperationContext.setMaxListeners

Since​

v15.4.0

Source​

packages/core/node_modules/@types/node/events.d.ts:317