Class: Emitter<Events>
Experimental
Minimal typed event emitter used by the render loop and render root.
Listener lists are copy-on-write arrays so emit (called every frame) iterates by index without allocating, and listeners may unsubscribe themselves during dispatch. A listener that throws does not stop the others: its error is reported (reportError) and dispatch carries on.
Type Parameters
| Type Parameter |
|---|
Events extends object |
Constructors
Constructor
ts
new Emitter<Events>(): Emitter<Events>;Experimental
Returns
Emitter<Events>
Methods
clear()
ts
clear(): void;Experimental
Returns
void
emit()
ts
emit<K>(type, payload): void;Experimental
Type Parameters
| Type Parameter |
|---|
K extends string | number | symbol |
Parameters
| Parameter | Type |
|---|---|
type | K |
payload | Events[K] |
Returns
void
has()
ts
has(type): boolean;Experimental
Whether anything listens to type (lets callers skip building payloads).
Parameters
| Parameter | Type |
|---|---|
type | keyof Events |
Returns
boolean
on()
ts
on<K>(type, listener): () => void;Experimental
Subscribe to type. Returns an idempotent unsubscribe function.
Type Parameters
| Type Parameter |
|---|
K extends string | number | symbol |
Parameters
| Parameter | Type |
|---|---|
type | K |
listener | (payload) => void |
Returns
() => void