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Hue
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EventEmitter↳
Hue
- _rest
- _sse
- bridges
- devicePowers
- devices
- groupedLights
- lights
- motions
- off
- on
- once
- options
- removeAllListeners
- rooms
- scenes
- zigbeeConnectivities
- zigbeeDeviceDiscoveries
- zones
- captureRejectionSymbol
- captureRejections
- defaultMaxListeners
- errorMonitor
- _create
- addListener
- connect
- emit
- eventNames
- getMaxListeners
- listenerCount
- listeners
- prependListener
- prependOnceListener
- rawListeners
- removeListener
- setMaxListeners
- getEventListeners
- listenerCount
- on
- once
- setMaxListeners
• new Hue(options)
| Name | Type |
|---|---|
options |
HueOptions |
• Readonly _rest: Rest
• Readonly _sse: Sse
• Readonly bridges: BridgeManager
• Readonly devicePowers: DevicePowerManager
• Readonly devices: DeviceManager
• Readonly groupedLights: GroupedLightManager
• Readonly lights: LightManager
• Readonly motions: MotionManager
• off: <T>(event: T, listener: (...args: HueEvents[T]) => any) => Hue
▸ <T>(event, listener): Hue
| Name | Type |
|---|---|
T |
extends keyof HueEvents
|
| Name | Type |
|---|---|
event |
T |
listener |
(...args: HueEvents[T]) => any
|
• on: <T>(event: T, listener: (...args: HueEvents[T]) => any) => Hue
▸ <T>(event, listener): Hue
| Name | Type |
|---|---|
T |
extends keyof HueEvents
|
| Name | Type |
|---|---|
event |
T |
listener |
(...args: HueEvents[T]) => any
|
• once: <T>(event: T, listener: (...args: HueEvents[T]) => any) => Hue
▸ <T>(event, listener): Hue
| Name | Type |
|---|---|
T |
extends keyof HueEvents
|
| Name | Type |
|---|---|
event |
T |
listener |
(...args: HueEvents[T]) => any
|
• Readonly options: HueOptions
• removeAllListeners: <T>(event?: T) => Hue
▸ <T>(event?): Hue
| Name | Type |
|---|---|
T |
extends keyof HueEvents
|
| Name | Type |
|---|---|
event? |
T |
• Readonly rooms: RoomManager
• Readonly scenes: SceneManager
• Readonly zigbeeConnectivities: ZigbeeConnectivityManager
• Readonly zigbeeDeviceDiscoveries: ZigbeeDeviceDiscoveryManager
• Readonly zones: ZoneManager
▪ Static Readonly captureRejectionSymbol: typeof captureRejectionSymbol
Value: Symbol.for('nodejs.rejection')
See how to write a custom rejection handler.
Since
v13.4.0, v12.16.0
node_modules/@types/node/events.d.ts:326
▪ Static captureRejections: boolean
Value: boolean
Change the default captureRejections option on all new EventEmitter objects.
Since
v13.4.0, v12.16.0
node_modules/@types/node/events.d.ts:333
▪ Static defaultMaxListeners: number
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'.
Since
v0.11.2
node_modules/@types/node/events.d.ts:370
▪ 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.
Since
v13.6.0, v12.17.0
node_modules/@types/node/events.d.ts:319
• get _url(): string
string
▸ _create(data): undefined | NarrowResource
| Name | Type |
|---|---|
data |
any |
undefined | NarrowResource
▸ addListener(eventName, listener): Hue
Alias for emitter.on(eventName, listener).
Since
v0.1.26
| Name | Type |
|---|---|
eventName |
string | symbol
|
listener |
(...args: any[]) => void
|
node_modules/@types/node/events.d.ts:390
▸ connect(): Promise<void>
Promise<void>
▸ 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.
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 listenerSince
v0.1.26
| Name | Type |
|---|---|
eventName |
string | symbol
|
...args |
any[] |
boolean
node_modules/@types/node/events.d.ts:652
▸ 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.
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) ]Since
v6.0.0
(string | symbol)[]
node_modules/@types/node/events.d.ts:715
▸ getMaxListeners(): number
Returns the current max listener value for the EventEmitter which is either
set by emitter.setMaxListeners(n) or defaults to defaultMaxListeners.
Since
v1.0.0
number
node_modules/@types/node/events.d.ts:567
▸ listenerCount(eventName, listener?): number
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.
Since
v3.2.0
| Name | Type | Description |
|---|---|---|
eventName |
string | symbol
|
The name of the event being listened for |
listener? |
Function |
The event handler function |
number
node_modules/@types/node/events.d.ts:661
▸ 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] ]Since
v0.1.26
| Name | Type |
|---|---|
eventName |
string | symbol
|
Function[]
node_modules/@types/node/events.d.ts:580
▸ prependListener(eventName, listener): Hue
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.
Since
v6.0.0
| Name | Type | Description |
|---|---|---|
eventName |
string | symbol
|
The name of the event. |
listener |
(...args: any[]) => void
|
The callback function |
node_modules/@types/node/events.d.ts:679
▸ prependOnceListener(eventName, listener): Hue
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.
Since
v6.0.0
| Name | Type | Description |
|---|---|---|
eventName |
string | symbol
|
The name of the event. |
listener |
(...args: any[]) => void
|
The callback function |
node_modules/@types/node/events.d.ts:695
▸ 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()).
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');Since
v9.4.0
| Name | Type |
|---|---|
eventName |
string | symbol
|
Function[]
node_modules/@types/node/events.d.ts:611
▸ removeListener(eventName, listener): Hue
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:
// ABecause 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.
Since
v0.1.26
| Name | Type |
|---|---|
eventName |
string | symbol
|
listener |
(...args: any[]) => void
|
node_modules/@types/node/events.d.ts:535
▸ setMaxListeners(n): Hue
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.
Since
v0.3.5
| Name | Type |
|---|---|
n |
number |
node_modules/@types/node/events.d.ts:561
▸ 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.
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] ]
}Since
v15.2.0, v14.17.0
| Name | Type |
|---|---|
emitter |
EventEmitter | _DOMEventTarget
|
name |
string | symbol
|
Function[]
node_modules/@types/node/events.d.ts:296
▸ Static listenerCount(emitter, eventName): number
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: 2Since
v0.9.12
Deprecated
Since v3.2.0 - Use listenerCount instead.
| Name | Type | Description |
|---|---|---|
emitter |
EventEmitter |
The emitter to query |
eventName |
string | symbol
|
The event name |
number
node_modules/@types/node/events.d.ts:268
▸ Static on(emitter, eventName, options?): AsyncIterableIterator<any>
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 hereReturns 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());Since
v13.6.0, v12.16.0
| Name | Type | Description |
|---|---|---|
emitter |
EventEmitter |
- |
eventName |
string |
The name of the event being listened for |
options? |
StaticEventEmitterOptions |
- |
AsyncIterableIterator<any>
that iterates eventName events emitted by the emitter
node_modules/@types/node/events.d.ts:250
▸ 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.
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 boomAn 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!Since
v11.13.0, v10.16.0
| Name | Type |
|---|---|
emitter |
_NodeEventTarget |
eventName |
string | symbol
|
options? |
StaticEventEmitterOptions |
Promise<any[]>
node_modules/@types/node/events.d.ts:189
▸ Static once(emitter, eventName, options?): Promise<any[]>
| Name | Type |
|---|---|
emitter |
_DOMEventTarget |
eventName |
string |
options? |
StaticEventEmitterOptions |
Promise<any[]>
node_modules/@types/node/events.d.ts:190
▸ Static setMaxListeners(n?, ...eventTargets): void
import { setMaxListeners, EventEmitter } from 'node:events';
const target = new EventTarget();
const emitter = new EventEmitter();
setMaxListeners(5, target, emitter);Since
v15.4.0
| Name | Type | Description |
|---|---|---|
n? |
number |
A non-negative number. The maximum number of listeners per EventTarget event. |
...eventTargets |
(EventEmitter | _DOMEventTarget)[] |
- |
void
node_modules/@types/node/events.d.ts:311