EventEmitter

Defined in: core/src/utils/utils.eventemitter.ts:14

A typed event emitter where T maps event names to their listener signatures, giving on/emit fully typed arguments per event.

Extended by

• ProviderInstance
• ProviderRegistry
• Slot

Type Parameters

Type Parameter
T extends Record<string, (…args) => void | Promise<void>>

Constructors

Constructor

new EventEmitter<T>(): EventEmitter<T>;

Returns

EventEmitter<T>

Methods

emit()

emit<K>(event, ...args): void;

Defined in: core/src/utils/utils.eventemitter.ts:62

Invokes all listeners for event synchronously, without awaiting async listeners.

Type Parameters

Type Parameter
K extends string | number | symbol

Parameters

Parameter	Type
event	K
…args	Parameters<T[K]>

Returns

void

---

emitAsync()

emitAsync<K>(event, ...args): Promise<void>;

Defined in: core/src/utils/utils.eventemitter.ts:73

Invokes all listeners for event and awaits them concurrently via Promise.all.

Type Parameters

Type Parameter
K extends string | number | symbol

Parameters

Parameter	Type
event	K
…args	Parameters<T[K]>

Returns

Promise<void>

---

on()

on<K>(
   event,
   callback,
   options?): () => void;

Defined in: core/src/utils/utils.eventemitter.ts:21

Registers callback for event. Returns an unsubscribe function; passing options.abortSignal also removes the listener when that signal aborts.

Type Parameters

Type Parameter
K extends string | number | symbol

Parameters

Parameter	Type
event	K
callback	EventListener<Parameters<T[K]>>
options	OnOptions

Returns

() => void

---

once()

once<K>(
   event,
   callback,
   options?): () => void;

Defined in: core/src/utils/utils.eventemitter.ts:45

Like on, but the listener is removed after firing once.

Type Parameters

Type Parameter
K extends string | number | symbol

Parameters

Parameter	Type
event	K
callback	EventListener<Parameters<T[K]>>
options	OnOptions

Returns

() => void