Client class

Reference

Package:: azure-iot-device

IoT Hub device client used to connect a device with an Azure IoT hub.

Users of the SDK should call one of the factory methods, fromConnectionString or fromSharedAccessSignature to create an IoT Hub device client.

Extends: InternalClient

Constructors

Client(DeviceTransport, string, BlobUploadClient, FileUploadInterface)

Inherited Properties

captureRejections	Value: boolean Change the default `captureRejections` option on all new `EventEmitter` objects.
captureRejectionSymbol	Value: `Symbol.for('nodejs.rejection')` See how to write a custom `rejection handler`.
defaultMaxListeners	By default, a maximum of `10` listeners can be registered for any single event. This limit can be changed for individual `EventEmitter` instances using the `emitter.setMaxListeners(n)` method. To change the default for all`EventEmitter` instances, the `events.defaultMaxListeners`property can be used. If this value is not a positive number, a `RangeError`is thrown. Take caution when setting the `events.defaultMaxListeners` because the change affects all`EventEmitter` instances, including those created before the change is made. However, calling `emitter.setMaxListeners(n)` still has precedence over `events.defaultMaxListeners`. This is not a hard limit. The `EventEmitter` instance will allow more listeners to be added but will output a trace warning to stderr indicating that a "possible EventEmitter memory leak" has been detected. For any single`EventEmitter`, the `emitter.getMaxListeners()` and `emitter.setMaxListeners()`methods can be used to temporarily avoid this warning: `import { EventEmitter } from 'node:events'; const emitter = new EventEmitter(); emitter.setMaxListeners(emitter.getMaxListeners() + 1); emitter.once('event', () => { // do stuff emitter.setMaxListeners(Math.max(emitter.getMaxListeners() - 1, 0)); });` The `--trace-warnings` command-line flag can be used to display the stack trace for such warnings. The emitted warning can be inspected with `process.on('warning')` and will have the additional `emitter`, `type`, and `count` properties, referring to the event emitter instance, the event's name and the number of attached listeners, respectively. Its `name` property is set to `'MaxListenersExceededWarning'`.
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.

Methods

close()
close(Callback<Disconnected>)	Closes the transport connection and destroys the client resources. Note: After calling this method the Client object cannot be reused.
fromAuthenticationProvider(AuthenticationProvider, any)	Creates an IoT Hub device client from the given authentication method and using the given transport type.
fromConnectionString(string, any)	Creates an IoT Hub device client from the given connection string using the given transport type.
fromSharedAccessSignature(string, any)	Creates an IoT Hub device client from the given shared access signature using the given transport type.
getBlobSharedAccessSignature(string)
getBlobSharedAccessSignature(string, Callback<UploadParams>)	The `getBlobSharedAccessSignature` gets the linked storage account SAS Token from IoT Hub
notifyBlobUploadStatus(string, boolean, number, string)
notifyBlobUploadStatus(string, boolean, number, string, ErrorCallback)	The `notifyBlobUploadStatus` method sends IoT Hub the result of a blob upload.
onDeviceMethod(string, (request: DeviceMethodRequest, response: DeviceMethodResponse) => void)	Registers a callback for a method named `methodName`.
setOptions(DeviceClientOptions)
setOptions(DeviceClientOptions, Callback<TransportConfigured>)
uploadToBlob(string, Stream, number)
uploadToBlob(string, Stream, number, ErrorCallback)	The `uploadToBlob` method uploads a stream to a blob.

Inherited Methods

abandon(Message)
abandon(Message, Callback<MessageAbandoned>)
addAbortListener(AbortSignal, (event: Event) => void)	Listens once to the `abort` event on the provided `signal`. Listening to the `abort` event on abort signals is unsafe and may lead to resource leaks since another third party with the signal can call `e.stopImmediatePropagation()`. Unfortunately Node.js cannot change this since it would violate the web standard. Additionally, the original API makes it easy to forget to remove listeners. This API allows safely using `AbortSignal`s in Node.js APIs by solving these two issues by listening to the event such that `stopImmediatePropagation` does not prevent the listener from running. Returns a disposable so that it may be unsubscribed from more easily. `import { addAbortListener } from 'node:events'; function example(signal) { let disposable; try { signal.addEventListener('abort', (e) => e.stopImmediatePropagation()); disposable = addAbortListener(signal, (e) => { // Do something when signal is aborted. }); } finally { disposable?.[Symbol.dispose](); } }`
addListener<K>(string \| symbol, (args: any[]) => void)	Alias for `emitter.on(eventName, listener)`.
complete(Message)
complete(Message, Callback<MessageCompleted>)
emit<K>(string \| symbol, AnyRest)	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. import { EventEmitter } from 'node: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
eventNames()	Returns an array listing the events for which the emitter has registered listeners. The values in the array are strings or `Symbol`s. `import { EventEmitter } from 'node: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) ]`
getEventListeners(EventEmitter<DefaultEventMap> \| _DOMEventTarget, string \| symbol)	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. `import { getEventListeners, EventEmitter } from 'node:events'; { const ee = new EventEmitter(); const listener = () => console.log('Events are fun'); ee.on('foo', listener); console.log(getEventListeners(ee, 'foo')); // [ [Function: listener] ] } { const et = new EventTarget(); const listener = () => console.log('Events are fun'); et.addEventListener('foo', listener); console.log(getEventListeners(et, 'foo')); // [ [Function: listener] ] }`
getMaxListeners()	Returns the current max listener value for the `EventEmitter` which is either set by `emitter.setMaxListeners(n)` or defaults to defaultMaxListeners.
getMaxListeners(EventEmitter<DefaultEventMap> \| _DOMEventTarget)	Returns the currently set max amount of listeners. For `EventEmitter`s this behaves exactly the same as calling `.getMaxListeners` on the emitter. For `EventTarget`s this is the only way to get the max event listeners for the event target. If the number of event handlers on a single EventTarget exceeds the max set, the EventTarget will print a warning. `import { getMaxListeners, setMaxListeners, EventEmitter } from 'node:events'; { const ee = new EventEmitter(); console.log(getMaxListeners(ee)); // 10 setMaxListeners(11, ee); console.log(getMaxListeners(ee)); // 11 } { const et = new EventTarget(); console.log(getMaxListeners(et)); // 10 setMaxListeners(11, et); console.log(getMaxListeners(et)); // 11 }`
getTwin()
getTwin(Callback<Twin>)
listenerCount(EventEmitter<DefaultEventMap>, string \| symbol)	A class method that returns the number of listeners for the given `eventName`registered on the given `emitter`. `import { EventEmitter, listenerCount } from 'node:events'; const myEmitter = new EventEmitter(); myEmitter.on('event', () => {}); myEmitter.on('event', () => {}); console.log(listenerCount(myEmitter, 'event')); // Prints: 2`
listenerCount<K>(string \| symbol, Function)	Returns the number of listeners listening for the event named `eventName`. If `listener` is provided, it will return how many times the listener is found in the list of the listeners of the event.
listeners<K>(string \| symbol)	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] ]`
off<K>(string \| symbol, (args: any[]) => void)	Alias for `emitter.removeListener()`.
on(EventEmitter<DefaultEventMap>, string, StaticEventEmitterOptions)	`import { on, EventEmitter } from 'node:events'; import process from 'node:process'; 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: import { on, EventEmitter } from 'node:events'; import process from 'node:process'; 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());
on<K>(string \| symbol, (args: any[]) => void)	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. `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. `import { EventEmitter } from 'node:events'; const myEE = new EventEmitter(); myEE.on('foo', () => console.log('a')); myEE.prependListener('foo', () => console.log('b')); myEE.emit('foo'); // Prints: // b // a`
once(EventEmitter<DefaultEventMap>, string \| symbol, StaticEventEmitterOptions)	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. `import { once, EventEmitter } from 'node:events'; import process from 'node:process'; 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.error('error happened', err); }` 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: `import { EventEmitter, once } from 'node:events'; const ee = new EventEmitter(); once(ee, 'error') .then(([err]) => console.log('ok', err.message)) .catch((err) => console.error('error', err.message)); ee.emit('error', new Error('boom')); // Prints: ok boom` An `AbortSignal` can be used to cancel waiting for the event: import { EventEmitter, once } from 'node: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!
once(_DOMEventTarget, string, StaticEventEmitterOptions)
once<K>(string \| symbol, (args: any[]) => void)	Adds a one-time`listener` 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. The`emitter.prependOnceListener()` method can be used as an alternative to add the event listener to the beginning of the listeners array. `import { EventEmitter } from 'node:events'; const myEE = new EventEmitter(); myEE.once('foo', () => console.log('a')); myEE.prependOnceListener('foo', () => console.log('b')); myEE.emit('foo'); // Prints: // b // a`
open()
open(Callback<Connected>)
prependListener<K>(string \| symbol, (args: any[]) => void)	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. `server.prependListener('connection', (stream) => { console.log('someone connected!'); });` Returns a reference to the `EventEmitter`, so that calls can be chained.
prependOnceListener<K>(string \| symbol, (args: any[]) => void)	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. `server.prependOnceListener('connection', (stream) => { console.log('Ah, we have our first user!'); });` Returns a reference to the `EventEmitter`, so that calls can be chained.
rawListeners<K>(string \| symbol)	Returns a copy of the array of listeners for the event named `eventName`, including any wrappers (such as those created by `.once()`). import { EventEmitter } from 'node:events'; 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');
reject(Message)
reject(Message, Callback<MessageRejected>)
removeAllListeners(string \| symbol)	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.
removeListener<K>(string \| symbol, (args: any[]) => void)	Removes the specified `listener` from the listener array for the event named`eventName`. `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. import { EventEmitter } from 'node:events'; class MyEmitter extends EventEmitter {} 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: `import { EventEmitter } from 'node:events'; 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.
sendEvent(Message)
sendEvent(Message, Callback<MessageEnqueued>)
sendEventBatch(Message[])
sendEventBatch(Message[], Callback<MessageEnqueued>)
setMaxListeners(number)	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.
setMaxListeners(number, (EventEmitter<DefaultEventMap> \| _DOMEventTarget)[])	`import { setMaxListeners, EventEmitter } from 'node:events'; const target = new EventTarget(); const emitter = new EventEmitter(); setMaxListeners(5, target, emitter);`
setRetryPolicy(RetryPolicy)	Sets the retry policy used by the client on all operations. The default is ExponentialBackoffWithJitter.
setTransportOptions(any)
setTransportOptions(any, Callback<TransportConfigured>)
updateSharedAccessSignature(string, Callback<SharedAccessSignatureUpdated>)
[captureRejectionSymbol]<K>(Error, string \| symbol, AnyRest)

Constructor Details

Client(DeviceTransport, string, BlobUploadClient, FileUploadInterface)

new Client(transport: DeviceTransport, connStr?: string, blobUploadClient?: BlobUploadClient, fileUploadApi?: FileUploadInterface)

Parameters

transport: DeviceTransport

An object that implements the interface expected of a transport object, e.g., Http.

connStr: string

A connection string (optional: when not provided, updateSharedAccessSignature must be called to set the SharedAccessSignature token directly).

blobUploadClient: BlobUploadClient

An object that is capable of uploading a stream to a blob.

fileUploadApi: FileUploadInterface

An object that is used for communicating with IoT Hub for Blob Storage related actions.

Inherited Property Details

captureRejections

Value: boolean

Change the default captureRejections option on all new EventEmitter objects.

static captureRejections: boolean

Property Value

boolean

Inherited From InternalClient.captureRejections

captureRejectionSymbol

Value: Symbol.for('nodejs.rejection')

See how to write a custom rejection handler.

static captureRejectionSymbol: typeof captureRejectionSymbol

Property Value

typeof captureRejectionSymbol

Inherited From InternalClient.captureRejectionSymbol

defaultMaxListeners

By default, a maximum of 10 listeners can be registered for any single event. This limit can be changed for individual EventEmitter instances using the emitter.setMaxListeners(n) method. To change the default for allEventEmitter instances, the events.defaultMaxListenersproperty can be used. If this value is not a positive number, a RangeErroris thrown.

Take caution when setting the events.defaultMaxListeners because the change affects allEventEmitter instances, including those created before the change is made. However, calling emitter.setMaxListeners(n) still has precedence over events.defaultMaxListeners.

This is not a hard limit. The EventEmitter instance will allow more listeners to be added but will output a trace warning to stderr indicating that a "possible EventEmitter memory leak" has been detected. For any singleEventEmitter, the emitter.getMaxListeners() and emitter.setMaxListeners()methods can be used to temporarily avoid this warning:

import { EventEmitter } from 'node:events';
const emitter = new EventEmitter();
emitter.setMaxListeners(emitter.getMaxListeners() + 1);
emitter.once('event', () => {
  // do stuff
  emitter.setMaxListeners(Math.max(emitter.getMaxListeners() - 1, 0));
});

The --trace-warnings command-line flag can be used to display the stack trace for such warnings.

The emitted warning can be inspected with process.on('warning') and will have the additional emitter, type, and count properties, referring to the event emitter instance, the event's name and the number of attached listeners, respectively. Its name property is set to 'MaxListenersExceededWarning'.

static defaultMaxListeners: number

Property Value

number

Inherited From InternalClient.defaultMaxListeners

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.

static errorMonitor: typeof errorMonitor

Property Value

typeof errorMonitor

Inherited From InternalClient.errorMonitor

Method Details

close()

function close(): Promise<Disconnected>

Returns

Promise<Disconnected>

close(Callback<Disconnected>)

Closes the transport connection and destroys the client resources.

Note: After calling this method the Client object cannot be reused.

function close(closeCallback?: Callback<Disconnected>)

Parameters

closeCallback: Callback<Disconnected>

Optional function to call once the transport is disconnected and the client closed.

fromAuthenticationProvider(AuthenticationProvider, any)

Creates an IoT Hub device client from the given authentication method and using the given transport type.

static function fromAuthenticationProvider(authenticationProvider: AuthenticationProvider, transportCtor: any): Client

Parameters

authenticationProvider: AuthenticationProvider

Object used to obtain the authentication parameters for the IoT hub.

transportCtor: any

Transport protocol used to connect to IoT hub.

Returns

Client

fromConnectionString(string, any)

Creates an IoT Hub device client from the given connection string using the given transport type.

static function fromConnectionString(connStr: string, transportCtor: any): Client

Parameters

connStr: string

A connection string which encapsulates "device connect" permissions on an IoT hub.

transportCtor: any

A transport constructor.

Returns

Client

fromSharedAccessSignature(string, any)

Creates an IoT Hub device client from the given shared access signature using the given transport type.

static function fromSharedAccessSignature(sharedAccessSignature: string, transportCtor: any): Client

Parameters

sharedAccessSignature: string

A shared access signature which encapsulates "device connect" permissions on an IoT hub.

transportCtor: any

Returns

Client

getBlobSharedAccessSignature(string)

function getBlobSharedAccessSignature(blobName: string): Promise<UploadParams>

Parameters

blobName: string

Returns

Promise<UploadParams>

getBlobSharedAccessSignature(string, Callback<UploadParams>)

The getBlobSharedAccessSignature gets the linked storage account SAS Token from IoT Hub

function getBlobSharedAccessSignature(blobName: string, callback?: Callback<UploadParams>)

Parameters

blobName: string

The name to use for the blob that will be created with the content of the stream.

callback: Callback<UploadParams>

Optional callback to call when the upload is complete.

notifyBlobUploadStatus(string, boolean, number, string)

function notifyBlobUploadStatus(correlationId: string, isSuccess: boolean, statusCode: number, statusDescription: string): Promise<void>

Parameters

correlationId: string

isSuccess: boolean

statusCode: number

statusDescription: string

Returns

Promise<void>

notifyBlobUploadStatus(string, boolean, number, string, ErrorCallback)

The notifyBlobUploadStatus method sends IoT Hub the result of a blob upload.

function notifyBlobUploadStatus(correlationId: string, isSuccess: boolean, statusCode: number, statusDescription: string, callback?: ErrorCallback)

Parameters

correlationId: string

An id for correlating a upload status to a specific blob. Generated during the call to getBlobSharedAccessSignature.

isSuccess: boolean

The success or failure status from the storage blob operation result.

statusCode: number

The HTTP status code associated with the storage blob result.

statusDescription: string

The description of the HTTP status code.

callback: ErrorCallback

Optional callback to call when the upload is complete.

onDeviceMethod(string, (request: DeviceMethodRequest, response: DeviceMethodResponse) => void)

Registers a callback for a method named methodName.

function onDeviceMethod(methodName: string, callback: (request: DeviceMethodRequest, response: DeviceMethodResponse) => void)

Parameters

methodName: string

Name of the method that will be handled by the callback

callback: (request: DeviceMethodRequest, response: DeviceMethodResponse) => void

Function that shall be called whenever a method request for the method called methodName is received.

setOptions(DeviceClientOptions)

function setOptions(options: DeviceClientOptions): Promise<TransportConfigured>

Parameters

options: DeviceClientOptions

Returns

Promise<TransportConfigured>

setOptions(DeviceClientOptions, Callback<TransportConfigured>)

function setOptions(options: DeviceClientOptions, done: Callback<TransportConfigured>)

Parameters

options: DeviceClientOptions

done: Callback<TransportConfigured>

uploadToBlob(string, Stream, number)

function uploadToBlob(blobName: string, stream: Stream, streamLength: number): Promise<void>

Parameters

blobName: string

stream: Stream

streamLength: number

Returns

Promise<void>

uploadToBlob(string, Stream, number, ErrorCallback)

The uploadToBlob method uploads a stream to a blob.

function uploadToBlob(blobName: string, stream: Stream, streamLength: number, callback: ErrorCallback)

Parameters

blobName: string

The name to use for the blob that will be created with the content of the stream.

stream: Stream

The data to that should be uploaded to the blob.

streamLength: number

The size of the data to that should be uploaded to the blob.

callback: ErrorCallback

Inherited Method Details

abandon(Message)

function abandon(message: Message): Promise<MessageAbandoned>

Parameters

message: Message

Returns

Promise<MessageAbandoned>

Inherited From InternalClient.abandon

abandon(Message, Callback<MessageAbandoned>)

function abandon(message: Message, abandonCallback: Callback<MessageAbandoned>)

Parameters

message: Message

abandonCallback: Callback<MessageAbandoned>

Inherited From InternalClient.abandon

addAbortListener(AbortSignal, (event: Event) => void)

Listens once to the abort event on the provided signal.

Listening to the abort event on abort signals is unsafe and may lead to resource leaks since another third party with the signal can call e.stopImmediatePropagation(). Unfortunately Node.js cannot change this since it would violate the web standard. Additionally, the original API makes it easy to forget to remove listeners.

This API allows safely using AbortSignals in Node.js APIs by solving these two issues by listening to the event such that stopImmediatePropagation does not prevent the listener from running.

Returns a disposable so that it may be unsubscribed from more easily.

import { addAbortListener } from 'node:events';

function example(signal) {
  let disposable;
  try {
    signal.addEventListener('abort', (e) => e.stopImmediatePropagation());
    disposable = addAbortListener(signal, (e) => {
      // Do something when signal is aborted.
    });
  } finally {
    disposable?.[Symbol.dispose]();
  }
}

static function addAbortListener(signal: AbortSignal, resource: (event: Event) => void): Disposable

Parameters

signal: AbortSignal

resource: (event: Event) => void

Returns

Disposable

Disposable that removes the abort listener.

Inherited From InternalClient.addAbortListener

addListener<K>(string | symbol, (args: any[]) => void)

Alias for emitter.on(eventName, listener).

function addListener<K>(eventName: string | symbol, listener: (args: any[]) => void): Client

Parameters

eventName: string | symbol

listener: (args: any[]) => void

Returns

Client

Inherited From InternalClient.addListener

complete(Message)

function complete(message: Message): Promise<MessageCompleted>

Parameters

message: Message

Returns

Promise<MessageCompleted>

Inherited From InternalClient.complete

complete(Message, Callback<MessageCompleted>)

function complete(message: Message, completeCallback: Callback<MessageCompleted>)

Parameters

message: Message

completeCallback: Callback<MessageCompleted>

Inherited From InternalClient.complete

emit<K>(string | symbol, AnyRest)

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.

import { EventEmitter } from 'node: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

function emit<K>(eventName: string | symbol, args: AnyRest): boolean

Parameters

eventName: string | symbol

args: AnyRest

Returns

boolean

Inherited From InternalClient.emit

eventNames()

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

import { EventEmitter } from 'node: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) ]

function eventNames(): (string | symbol)[]

Returns

(string | symbol)[]

Inherited From InternalClient.eventNames

getEventListeners(EventEmitter<DefaultEventMap> | _DOMEventTarget, string | symbol)

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.

import { getEventListeners, EventEmitter } from 'node:events';

{
  const ee = new EventEmitter();
  const listener = () => console.log('Events are fun');
  ee.on('foo', listener);
  console.log(getEventListeners(ee, 'foo')); // [ [Function: listener] ]
}
{
  const et = new EventTarget();
  const listener = () => console.log('Events are fun');
  et.addEventListener('foo', listener);
  console.log(getEventListeners(et, 'foo')); // [ [Function: listener] ]
}

static function getEventListeners(emitter: EventEmitter<DefaultEventMap> | _DOMEventTarget, name: string | symbol): Function[]

Parameters

emitter: EventEmitter<DefaultEventMap> | _DOMEventTarget

name: string | symbol

Returns

Function[]

Inherited From InternalClient.getEventListeners

getMaxListeners()

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

function getMaxListeners(): number

Returns

number

Inherited From InternalClient.getMaxListeners

getMaxListeners(EventEmitter<DefaultEventMap> | _DOMEventTarget)

Returns the currently set max amount of listeners.

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

For EventTargets this is the only way to get the max event listeners for the event target. If the number of event handlers on a single EventTarget exceeds the max set, the EventTarget will print a warning.

import { getMaxListeners, setMaxListeners, EventEmitter } from 'node:events';

{
  const ee = new EventEmitter();
  console.log(getMaxListeners(ee)); // 10
  setMaxListeners(11, ee);
  console.log(getMaxListeners(ee)); // 11
}
{
  const et = new EventTarget();
  console.log(getMaxListeners(et)); // 10
  setMaxListeners(11, et);
  console.log(getMaxListeners(et)); // 11
}

static function getMaxListeners(emitter: EventEmitter<DefaultEventMap> | _DOMEventTarget): number

Parameters

emitter: EventEmitter<DefaultEventMap> | _DOMEventTarget

Returns

number

Inherited From InternalClient.getMaxListeners

getTwin()

function getTwin(): Promise<Twin>

Returns

Promise<Twin>

Inherited From InternalClient.getTwin

getTwin(Callback<Twin>)

function getTwin(done: Callback<Twin>)

Parameters

done: Callback<Twin>

Inherited From InternalClient.getTwin

listenerCount(EventEmitter<DefaultEventMap>, string | symbol)

Warning

This API is now deprecated.

Since v3.2.0 - Use listenerCount instead.

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

import { EventEmitter, listenerCount } from 'node:events';

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

static function listenerCount(emitter: EventEmitter<DefaultEventMap>, eventName: string | symbol): number

Parameters

emitter: EventEmitter<DefaultEventMap>

The emitter to query

eventName: string | symbol

The event name

Returns

number

Inherited From InternalClient.listenerCount

listenerCount<K>(string | symbol, Function)

Returns the number of listeners listening for the event named eventName. If listener is provided, it will return how many times the listener is found in the list of the listeners of the event.

function listenerCount<K>(eventName: string | symbol, listener?: Function): number

Parameters

eventName: string | symbol

The name of the event being listened for

listener: Function

The event handler function

Returns

number

Inherited From InternalClient.listenerCount

listeners<K>(string | symbol)

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] ]

function listeners<K>(eventName: string | symbol): Function[]

Parameters

eventName: string | symbol

Returns

Function[]

Inherited From InternalClient.listeners

off<K>(string | symbol, (args: any[]) => void)

Alias for emitter.removeListener().

function off<K>(eventName: string | symbol, listener: (args: any[]) => void): Client

Parameters

eventName: string | symbol

listener: (args: any[]) => void

Returns

Client

Inherited From InternalClient.off

on(EventEmitter<DefaultEventMap>, string, StaticEventEmitterOptions)

import { on, EventEmitter } from 'node:events';
import process from 'node:process';

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:

import { on, EventEmitter } from 'node:events';
import process from 'node:process';

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());

static function on(emitter: EventEmitter<DefaultEventMap>, eventName: string, options?: StaticEventEmitterOptions): AsyncIterableIterator<any>

Parameters

emitter: EventEmitter<DefaultEventMap>

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 InternalClient.on

on<K>(string | symbol, (args: any[]) => void)

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.

import { EventEmitter } from 'node:events';
const myEE = new EventEmitter();
myEE.on('foo', () => console.log('a'));
myEE.prependListener('foo', () => console.log('b'));
myEE.emit('foo');
// Prints:
//   b
//   a

function on<K>(eventName: string | symbol, listener: (args: any[]) => void): Client

Parameters

eventName: string | symbol

The name of the event.

listener: (args: any[]) => void

The callback function

Returns

Client

Inherited From InternalClient.on

once(EventEmitter<DefaultEventMap>, string | symbol, StaticEventEmitterOptions)

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.

import { once, EventEmitter } from 'node:events';
import process from 'node:process';

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.error('error happened', err);
}

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:

import { EventEmitter, once } from 'node:events';

const ee = new EventEmitter();

once(ee, 'error')
  .then(([err]) => console.log('ok', err.message))
  .catch((err) => console.error('error', err.message));

ee.emit('error', new Error('boom'));

// Prints: ok boom

An AbortSignal can be used to cancel waiting for the event:

import { EventEmitter, once } from 'node: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!

static function once(emitter: EventEmitter<DefaultEventMap>, eventName: string | symbol, options?: StaticEventEmitterOptions): Promise<any[]>

Parameters

emitter: EventEmitter<DefaultEventMap>

eventName: string | symbol

options: StaticEventEmitterOptions

Returns

Promise<any[]>

Inherited From InternalClient.once

once(_DOMEventTarget, string, StaticEventEmitterOptions)

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

Parameters

emitter: _DOMEventTarget

eventName: string

options: StaticEventEmitterOptions

Returns

Promise<any[]>

Inherited From InternalClient.once

once<K>(string | symbol, (args: any[]) => void)

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.

import { EventEmitter } from 'node:events';
const myEE = new EventEmitter();
myEE.once('foo', () => console.log('a'));
myEE.prependOnceListener('foo', () => console.log('b'));
myEE.emit('foo');
// Prints:
//   b
//   a

function once<K>(eventName: string | symbol, listener: (args: any[]) => void): Client

Parameters

eventName: string | symbol

The name of the event.

listener: (args: any[]) => void

The callback function

Returns

Client

Inherited From InternalClient.once

open()

function open(): Promise<Connected>

Returns

Promise<Connected>

Inherited From InternalClient.open

open(Callback<Connected>)

function open(openCallback: Callback<Connected>)

Parameters

openCallback: Callback<Connected>

Inherited From InternalClient.open

prependListener<K>(string | symbol, (args: any[]) => void)

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.

function prependListener<K>(eventName: string | symbol, listener: (args: any[]) => void): Client

Parameters

eventName: string | symbol

The name of the event.

listener: (args: any[]) => void

The callback function

Returns

Client

Inherited From InternalClient.prependListener

prependOnceListener<K>(string | symbol, (args: any[]) => void)

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.

function prependOnceListener<K>(eventName: string | symbol, listener: (args: any[]) => void): Client

Parameters

eventName: string | symbol

The name of the event.

listener: (args: any[]) => void

The callback function

Returns

Client

Inherited From InternalClient.prependOnceListener

rawListeners<K>(string | symbol)

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

import { EventEmitter } from 'node:events';
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');

function rawListeners<K>(eventName: string | symbol): Function[]

Parameters

eventName: string | symbol

Returns

Function[]

Inherited From InternalClient.rawListeners

reject(Message)

function reject(message: Message): Promise<MessageRejected>

Parameters

message: Message

Returns

Promise<MessageRejected>

Inherited From InternalClient.reject

reject(Message, Callback<MessageRejected>)

function reject(message: Message, rejectCallback: Callback<MessageRejected>)

Parameters

message: Message

rejectCallback: Callback<MessageRejected>

Inherited From InternalClient.reject

removeAllListeners(string | symbol)

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.

function removeAllListeners(eventName?: string | symbol): Client

Parameters

eventName: string | symbol

Returns

Client

Inherited From InternalClient.removeAllListeners

removeListener<K>(string | symbol, (args: any[]) => void)

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.

import { EventEmitter } from 'node:events';
class MyEmitter extends EventEmitter {}
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:

import { EventEmitter } from 'node:events';
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.

function removeListener<K>(eventName: string | symbol, listener: (args: any[]) => void): Client

Parameters

eventName: string | symbol

listener: (args: any[]) => void

Returns

Client

Inherited From InternalClient.removeListener

sendEvent(Message)

function sendEvent(message: Message): Promise<MessageEnqueued>

Parameters

message: Message

Returns

Promise<MessageEnqueued>

Inherited From InternalClient.sendEvent

sendEvent(Message, Callback<MessageEnqueued>)

function sendEvent(message: Message, sendEventCallback: Callback<MessageEnqueued>)

Parameters

message: Message

sendEventCallback: Callback<MessageEnqueued>

Inherited From InternalClient.sendEvent

sendEventBatch(Message[])

function sendEventBatch(messages: Message[]): Promise<MessageEnqueued>

Parameters

messages: Message[]

Returns

Promise<MessageEnqueued>

Inherited From InternalClient.sendEventBatch

sendEventBatch(Message[], Callback<MessageEnqueued>)

function sendEventBatch(messages: Message[], sendEventBatchCallback: Callback<MessageEnqueued>)

Parameters

messages: Message[]

sendEventBatchCallback: Callback<MessageEnqueued>

Inherited From InternalClient.sendEventBatch

setMaxListeners(number)

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.

function setMaxListeners(n: number): Client

Parameters

n: number

Returns

Client

Inherited From InternalClient.setMaxListeners

setMaxListeners(number, (EventEmitter<DefaultEventMap> | _DOMEventTarget)[])

import { setMaxListeners, EventEmitter } from 'node:events';

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

setMaxListeners(5, target, emitter);

static function setMaxListeners(n?: number, eventTargets: (EventEmitter<DefaultEventMap> | _DOMEventTarget)[])

Parameters

n: number

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

eventTargets: (EventEmitter<DefaultEventMap> | _DOMEventTarget)[]

Inherited From InternalClient.setMaxListeners

setRetryPolicy(RetryPolicy)

Sets the retry policy used by the client on all operations. The default is ExponentialBackoffWithJitter.

function setRetryPolicy(policy: RetryPolicy)

Parameters

policy: RetryPolicy

{RetryPolicy} The retry policy that should be used for all future operations.

Inherited From InternalClient.setRetryPolicy

setTransportOptions(any)

function setTransportOptions(options: any): Promise<TransportConfigured>

Parameters

options: any

Returns

Promise<TransportConfigured>

Inherited From InternalClient.setTransportOptions

setTransportOptions(any, Callback<TransportConfigured>)

function setTransportOptions(options: any, done: Callback<TransportConfigured>)

Parameters

options: any

done: Callback<TransportConfigured>

Inherited From InternalClient.setTransportOptions

updateSharedAccessSignature(string, Callback<SharedAccessSignatureUpdated>)

function updateSharedAccessSignature(sharedAccessSignature: string, updateSasCallback?: Callback<SharedAccessSignatureUpdated>)

Parameters

sharedAccessSignature: string

updateSasCallback: Callback<SharedAccessSignatureUpdated>

Inherited From InternalClient.updateSharedAccessSignature

[captureRejectionSymbol]<K>(Error, string | symbol, AnyRest)

function [captureRejectionSymbol]<K>(error: Error, event: string | symbol, args: AnyRest)

Parameters

error: Error

event: string | symbol

args: AnyRest

Inherited From InternalClient.__@captureRejectionSymbol@138