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RN: Adopt Indexed Access Types in EventEmitter (#38243)

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Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/38243

Adopts [Indexed Access Types](https://flow.org/en/docs/types/indexed-access/) in `EventEmitter`.

Changelog:
[Internal]

Reviewed By: gkz, SamChou19815

Differential Revision: D47298095

fbshipit-source-id: bc8e2fe1292533dd11ada22f50aaea8621adcdca
This commit is contained in:
Tim Yung
2023-07-10 15:42:46 -07:00
committed by Facebook GitHub Bot
parent e6f77112a7
commit 3ff0160139
1 changed files with 13 additions and 13 deletions
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packages/react-native/Libraries/vendor/emitter/EventEmitter.js
Vendored
+13 -13
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@@ -15,13 +15,13 @@ export interface EventSubscription {
export interface IEventEmitter<TEventToArgsMap: {...}> {
addListener<TEvent: $Keys<TEventToArgsMap>>(
eventType: TEvent,
listener: (...args: $ElementType<TEventToArgsMap, TEvent>) => mixed,
listener: (...args: TEventToArgsMap[TEvent]) => mixed,
context?: mixed,
): EventSubscription;
emit<TEvent: $Keys<TEventToArgsMap>>(
eventType: TEvent,
...args: $ElementType<TEventToArgsMap, TEvent>
...args: TEventToArgsMap[TEvent]
): void;
removeAllListeners<TEvent: $Keys<TEventToArgsMap>>(eventType?: ?TEvent): void;
@@ -71,7 +71,7 @@ export default class EventEmitter<TEventToArgsMap: {...}>
*/
addListener<TEvent: $Keys<TEventToArgsMap>>(
eventType: TEvent,
listener: (...args: $ElementType<TEventToArgsMap, TEvent>) => mixed,
listener: (...args: TEventToArgsMap[TEvent]) => mixed,
context: mixed,
): EventSubscription {
if (typeof listener !== 'function') {
@@ -79,11 +79,12 @@ export default class EventEmitter<TEventToArgsMap: {...}>
'EventEmitter.addListener(...): 2nd argument must be a function.',
);
}
const registrations = allocate<_, _, TEventToArgsMap[TEvent]>(
this._registry,
eventType,
);
const registration: Registration<$ElementType<TEventToArgsMap, TEvent>> = {
const registrations = allocate<
TEventToArgsMap,
TEvent,
TEventToArgsMap[TEvent],
>(this._registry, eventType);
const registration: Registration<TEventToArgsMap[TEvent]> = {
context,
listener,
remove(): void {
@@ -103,11 +104,10 @@ export default class EventEmitter<TEventToArgsMap: {...}>
*/
emit<TEvent: $Keys<TEventToArgsMap>>(
eventType: TEvent,
...args: $ElementType<TEventToArgsMap, TEvent>
...args: TEventToArgsMap[TEvent]
): void {
const registrations: ?Set<
Registration<$ElementType<TEventToArgsMap, TEvent>>,
> = this._registry[eventType];
const registrations: ?Set<Registration<TEventToArgsMap[TEvent]>> =
this._registry[eventType];
if (registrations != null) {
for (const registration of [...registrations]) {
registration.listener.apply(registration.context, args);
@@ -140,7 +140,7 @@ export default class EventEmitter<TEventToArgsMap: {...}>
function allocate<
TEventToArgsMap: {...},
TEvent: $Keys<TEventToArgsMap>,
TEventArgs: $ElementType<TEventToArgsMap, TEvent>,
TEventArgs: TEventToArgsMap[TEvent],
>(
registry: Registry<TEventToArgsMap>,
eventType: TEvent,