Shoukaku
This content is for the 4.0.1 version. Switch to the latest version for up-to-date documentation.
Main Shoukaku class
Extends
EventEmitter
Constructors
new Shoukaku()
new Shoukaku(
connector
,nodes
,options
):Shoukaku
Parameters
• connector: Connector
A Discord library connector
• nodes: NodeOption
[]
An array that conforms to the NodeOption type that specifies nodes to connect to
• options: ShoukakuOptions
= {}
Options to pass to create this Shoukaku instance
Returns
Defined in
Properties
connections
readonly
connections:Map
<string
,Connection
>
Voice connections being handled
Defined in
connector
readonly
connector:Connector
Discord library connector
Defined in
id
id:
null
|string
Shoukaku instance identifier
Defined in
nodes
readonly
nodes:Map
<string
,Node
>
Connected Lavalink nodes
Defined in
options
readonly
options:Required
<ShoukakuOptions
>
Shoukaku options
Defined in
players
readonly
players:Map
<string
,Player
>
Players being handled
Defined in
captureRejectionSymbol
readonly
static
captureRejectionSymbol: typeofcaptureRejectionSymbol
Value: Symbol.for('nodejs.rejection')
See how to write a custom rejection handler
.
Since
v13.4.0, v12.16.0
Defined in
node_modules/@types/node/events.d.ts:452
captureRejections
static
captureRejections:boolean
Value: boolean
Change the default captureRejections
option on all new EventEmitter
objects.
Since
v13.4.0, v12.16.0
Defined in
node_modules/@types/node/events.d.ts:459
defaultMaxListeners
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.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'
.
Since
v0.11.2
Defined in
node_modules/@types/node/events.d.ts:498
errorMonitor
readonly
static
errorMonitor: typeoferrorMonitor
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
Defined in
node_modules/@types/node/events.d.ts:445
Methods
[captureRejectionSymbol]()?
optional
[captureRejectionSymbol]<K
>(error
,event
, …args
):void
Type Parameters
• K
Parameters
• error: Error
• event: string
| symbol
• …args: AnyRest
Returns
void
Defined in
node_modules/@types/node/events.d.ts:136
addListener()
addListener<
K
>(eventName
,listener
):this
Alias for emitter.on(eventName, listener)
.
Type Parameters
• K
Parameters
• eventName: string
| symbol
• listener
Returns
this
Since
v0.1.26
Defined in
node_modules/@types/node/events.d.ts:597
addNode()
addNode(
options
):void
Add a Lavalink node to the pool of available nodes
Parameters
• options: NodeOption
Returns
void
Defined in
emit()
emit<
K
>(eventName
, …args
):boolean
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 listenermyEmitter.on('event', function firstListener() { console.log('Helloooo! first listener');});// Second listenermyEmitter.on('event', function secondListener(arg1, arg2) { console.log(`event with parameters ${arg1}, ${arg2} in second listener`);});// Third listenermyEmitter.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
Type Parameters
• K
Parameters
• eventName: string
| symbol
• …args: AnyRest
Returns
boolean
Since
v0.1.26
Defined in
node_modules/@types/node/events.d.ts:859
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 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) ]
Returns
(string
| symbol
)[]
Since
v6.0.0
Defined in
node_modules/@types/node/events.d.ts:922
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
Since
v1.0.0
Defined in
node_modules/@types/node/events.d.ts:774
listenerCount()
listenerCount<
K
>(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.
Type Parameters
• K
Parameters
• eventName: string
| symbol
The name of the event being listened for
• listener?: Function
The event handler function
Returns
number
Since
v3.2.0
Defined in
node_modules/@types/node/events.d.ts:868
listeners()
listeners<
K
>(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] ]
Type Parameters
• K
Parameters
• eventName: string
| symbol
Returns
Function
[]
Since
v0.1.26
Defined in
node_modules/@types/node/events.d.ts:787
off()
off(event, listener)
off(
event
,listener
):this
Parameters
• event: "reconnecting"
• listener
Returns
this
Defined in
off(event, listener)
off(
event
,listener
):this
Parameters
• event: "debug"
• listener
Returns
this
Defined in
off(event, listener)
off(
event
,listener
):this
Parameters
• event: "error"
• listener
Returns
this
Defined in
off(event, listener)
off(
event
,listener
):this
Parameters
• event: "ready"
• listener
Returns
this
Defined in
off(event, listener)
off(
event
,listener
):this
Parameters
• event: "close"
• listener
Returns
this
Defined in
off(event, listener)
off(
event
,listener
):this
Parameters
• event: "disconnect"
• listener
Returns
this
Defined in
off(event, listener)
off(
event
,listener
):this
Parameters
• event: "raw"
• listener
Returns
this
Defined in
once()
once(event, listener)
once(
event
,listener
):this
Parameters
• event: "reconnecting"
• listener
Returns
this
Defined in
once(event, listener)
once(
event
,listener
):this
Parameters
• event: "debug"
• listener
Returns
this
Defined in
once(event, listener)
once(
event
,listener
):this
Parameters
• event: "error"
• listener
Returns
this
Defined in
once(event, listener)
once(
event
,listener
):this
Parameters
• event: "ready"
• listener
Returns
this
Defined in
once(event, listener)
once(
event
,listener
):this
Parameters
• event: "close"
• listener
Returns
this
Defined in
once(event, listener)
once(
event
,listener
):this
Parameters
• event: "disconnect"
• listener
Returns
this
Defined in
once(event, listener)
once(
event
,listener
):this
Parameters
• event: "raw"
• listener
Returns
this
Defined in
prependListener()
prependListener<
K
>(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 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.
Type Parameters
• K
Parameters
• eventName: string
| symbol
The name of the event.
• listener
The callback function
Returns
this
Since
v6.0.0
Defined in
node_modules/@types/node/events.d.ts:886
prependOnceListener()
prependOnceListener<
K
>(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.
Type Parameters
• K
Parameters
• eventName: string
| symbol
The name of the event.
• listener
The callback function
Returns
this
Since
v6.0.0
Defined in
node_modules/@types/node/events.d.ts:902
rawListeners()
rawListeners<
K
>(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 aboveconst listeners = emitter.rawListeners('log');const logFnWrapper = listeners[0];
// Logs "log once" to the console and does not unbind the `once` eventlogFnWrapper.listener();
// Logs "log once" to the console and removes the listenerlogFnWrapper();
emitter.on('log', () => console.log('log persistently'));// Will return a new Array with a single function bound by `.on()` aboveconst newListeners = emitter.rawListeners('log');
// Logs "log persistently" twicenewListeners[0]();emitter.emit('log');
Type Parameters
• K
Parameters
• eventName: string
| symbol
Returns
Function
[]
Since
v9.4.0
Defined in
node_modules/@types/node/events.d.ts:818
removeAllListeners()
removeAllListeners(
eventName
?):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
• eventName?: string
| symbol
Returns
this
Since
v0.1.26
Defined in
node_modules/@types/node/events.d.ts:758
removeListener()
removeListener<
K
>(eventName
,listener
):this
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 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.
Type Parameters
• K
Parameters
• eventName: string
| symbol
• listener
Returns
this
Since
v0.1.26
Defined in
node_modules/@types/node/events.d.ts:742
removeNode()
removeNode(
name
,reason
):void
Remove a Lavalink node from the pool of available nodes
Parameters
• name: string
Name of the node
• reason: string
= 'Remove node executed'
Reason of removing the node
Returns
void
Defined in
setMaxListeners()
setMaxListeners(
n
):this
By default EventEmitter
s will print a warning if more than 10
listeners are
added for a particular event. This is a useful default that helps finding
memory leaks. The emitter.setMaxListeners()
method allows the limit to be
modified for this specific EventEmitter
instance. The value can be set to Infinity
(or 0
) to indicate an unlimited number of listeners.
Returns a reference to the EventEmitter
, so that calls can be chained.
Parameters
• n: number
Returns
this
Since
v0.3.5
Defined in
node_modules/@types/node/events.d.ts:768
addAbortListener()
static
addAbortListener(signal
,resource
):Disposable
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](); }}
:::caution[Experimental] This API should not be used in production and may be trimmed from a public release. :::
Parameters
• signal: AbortSignal
• resource
Returns
Disposable
Disposable that removes the abort
listener.
Since
v20.5.0
Defined in
node_modules/@types/node/events.d.ts:437
getEventListeners()
static
getEventListeners(emitter
,name
):Function
[]
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] ]}
Parameters
• emitter: EventEmitter
<DefaultEventMap
> | EventTarget
• name: string
| symbol
Returns
Function
[]
Since
v15.2.0, v14.17.0
Defined in
node_modules/@types/node/events.d.ts:358
getMaxListeners()
static
getMaxListeners(emitter
):number
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}
Parameters
• emitter: EventEmitter
<DefaultEventMap
> | EventTarget
Returns
number
Since
v19.9.0
Defined in
node_modules/@types/node/events.d.ts:387
listenerCount()
static
listenerCount(emitter
,eventName
):number
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
:::caution[Deprecated]
Since v3.2.0 - Use listenerCount
instead.
:::
Parameters
• emitter: EventEmitter
<DefaultEventMap
>
The emitter to query
• eventName: string
| symbol
The event name
Returns
number
Since
v0.9.12
Defined in
node_modules/@types/node/events.d.ts:330
on()
on(emitter, eventName, options)
static
on(emitter
,eventName
,options
?):AsyncIterableIterator
<any
[]>
import { on, EventEmitter } from 'node:events';import process from 'node:process';
const ee = new EventEmitter();
// Emit later onprocess.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());
Use the close
option to specify an array of event names that will end the iteration:
import { on, EventEmitter } from 'node:events';import process from 'node:process';
const ee = new EventEmitter();
// Emit later onprocess.nextTick(() => { ee.emit('foo', 'bar'); ee.emit('foo', 42); ee.emit('close');});
for await (const event of on(ee, 'foo', { close: ['close'] })) { console.log(event); // prints ['bar'] [42]}// the loop will exit after 'close' is emittedconsole.log('done'); // prints 'done'
Parameters
• emitter: EventEmitter
<DefaultEventMap
>
• eventName: string
| symbol
• options?: StaticEventEmitterIteratorOptions
Returns
AsyncIterableIterator
<any
[]>
An AsyncIterator
that iterates eventName
events emitted by the emitter
Since
v13.6.0, v12.16.0
Defined in
node_modules/@types/node/events.d.ts:303
on(emitter, eventName, options)
static
on(emitter
,eventName
,options
?):AsyncIterableIterator
<any
[]>
Parameters
• emitter: EventTarget
• eventName: string
• options?: StaticEventEmitterIteratorOptions
Returns
AsyncIterableIterator
<any
[]>
Defined in
node_modules/@types/node/events.d.ts:308
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.
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 eventee.emit('foo'); // Prints: Waiting for the event was canceled!
Parameters
• emitter: EventEmitter
<DefaultEventMap
>
• eventName: string
| symbol
• options?: StaticEventEmitterOptions
Returns
Promise
<any
[]>
Since
v11.13.0, v10.16.0
Defined in
node_modules/@types/node/events.d.ts:217
once(emitter, eventName, options)
static
once(emitter
,eventName
,options
?):Promise
<any
[]>
Parameters
• emitter: EventTarget
• eventName: string
• options?: StaticEventEmitterOptions
Returns
Promise
<any
[]>
Defined in
node_modules/@types/node/events.d.ts:222
setMaxListeners()
static
setMaxListeners(n
?, …eventTargets
?):void
import { setMaxListeners, EventEmitter } from 'node: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
<DefaultEventMap
> | EventTarget
)[]
Returns
void
Since
v15.4.0
Defined in
node_modules/@types/node/events.d.ts:402
Events
on()
on(event, listener)
on(
event
,listener
):this
Emitted when reconnect tries are occurring and how many tries are left
Parameters
• event: "reconnecting"
• listener
Returns
this
Defined in
on(event, listener)
on(
event
,listener
):this
Emitted when data useful for debugging is produced
Parameters
• event: "debug"
• listener
Returns
this
Defined in
on(event, listener)
on(
event
,listener
):this
Emitted when an error occurs
Parameters
• event: "error"
• listener
Returns
this
Defined in
on(event, listener)
on(
event
,listener
):this
Emitted when Shoukaku is ready to receive operations
Parameters
• event: "ready"
• listener
Returns
this
Defined in
on(event, listener)
on(
event
,listener
):this
Emitted when a websocket connection to Lavalink closes
Parameters
• event: "close"
• listener
Returns
this
Defined in
on(event, listener)
on(
event
,listener
):this
Emitted when a websocket connection to Lavalink disconnects
Parameters
• event: "disconnect"
• listener
Returns
this
Defined in
on(event, listener)
on(
event
,listener
):this
Emitted when a raw message is received from Lavalink
Parameters
• event: "raw"
• listener
Returns
this