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RN: Use a Private Property in EventEmitter (#39395)

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Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/39395

Switches `EventEmitter` to use a private property.

Support for private properties was [only recently added](https://github.com/facebook/react-native/pull/39318), so this will be the first end-to-end validation of support in the `facebook/react-native` project.

Changelog:
[Internal]

Reviewed By: voideanvalue

Differential Revision: D49167908

fbshipit-source-id: 6a496ed130bfe5671663166626b1acbd80b0e9c3
This commit is contained in:
Tim Yung
2023-09-12 05:23:30 -07:00
committed by Facebook GitHub Bot
parent 34a7526e79
commit 06b5c6e9e0
1 changed files with 6 additions and 6 deletions
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packages/react-native/Libraries/vendor/emitter/EventEmitter.js
Vendored
+6 -6
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@@ -63,7 +63,7 @@ type Registry<TEventToArgsMap: {...}> = $ObjMap<
export default class EventEmitter<TEventToArgsMap: {...}>
implements IEventEmitter<TEventToArgsMap>
{
_registry: Registry<TEventToArgsMap> = {};
#registry: Registry<TEventToArgsMap> = {};
/**
* Registers a listener that is called when the supplied event is emitted.
@@ -83,7 +83,7 @@ export default class EventEmitter<TEventToArgsMap: {...}>
TEventToArgsMap,
TEvent,
TEventToArgsMap[TEvent],
>(this._registry, eventType);
>(this.#registry, eventType);
const registration: Registration<TEventToArgsMap[TEvent]> = {
context,
listener,
@@ -107,7 +107,7 @@ export default class EventEmitter<TEventToArgsMap: {...}>
...args: TEventToArgsMap[TEvent]
): void {
const registrations: ?Set<Registration<TEventToArgsMap[TEvent]>> =
this._registry[eventType];
this.#registry[eventType];
if (registrations != null) {
for (const registration of [...registrations]) {
registration.listener.apply(registration.context, args);
@@ -122,9 +122,9 @@ export default class EventEmitter<TEventToArgsMap: {...}>
eventType?: ?TEvent,
): void {
if (eventType == null) {
this._registry = {};
this.#registry = {};
} else {
delete this._registry[eventType];
delete this.#registry[eventType];
}
}
@@ -132,7 +132,7 @@ export default class EventEmitter<TEventToArgsMap: {...}>
* Returns the number of registered listeners for the supplied event.
*/
listenerCount<TEvent: $Keys<TEventToArgsMap>>(eventType: TEvent): number {
const registrations: ?Set<Registration<mixed>> = this._registry[eventType];
const registrations: ?Set<Registration<mixed>> = this.#registry[eventType];
return registrations == null ? 0 : registrations.size;
}
}