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RN: Improve NativeEventEmitter Flow Types

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Reviewed By: fkgozali

Differential Revision: D6050987

fbshipit-source-id: 1c911bed23f7d26800aafed4b7e7c30a1197f64b
This commit is contained in:
Tim Yung 2017-10-13 08:01:50 -07:00 committed by Facebook Github Bot
parent 4a2d3e9653
commit 2fff445b13
1 changed files with 17 additions and 7 deletions
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24
Libraries/EventEmitter/NativeEventEmitter.js
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@ -14,18 +14,24 @@
const EventEmitter = require('EventEmitter'); const EventEmitter = require('EventEmitter');
const Platform = require('Platform'); const Platform = require('Platform');
const RCTDeviceEventEmitter = require('RCTDeviceEventEmitter'); const RCTDeviceEventEmitter = require('RCTDeviceEventEmitter');
const invariant = require('fbjs/lib/invariant'); const invariant = require('fbjs/lib/invariant');
import type EmitterSubscription from 'EmitterSubscription'; import type EmitterSubscription from 'EmitterSubscription';
type NativeModule = {
+addListener: (eventType: string) => void,
+removeListeners: (count: number) => void,
};
/** /**
* Abstract base class for implementing event-emitting modules. This implements * Abstract base class for implementing event-emitting modules. This implements
* a subset of the standard EventEmitter node module API. * a subset of the standard EventEmitter node module API.
*/ */
class NativeEventEmitter extends EventEmitter { class NativeEventEmitter extends EventEmitter {
_nativeModule: Object; _nativeModule: ?NativeModule;
constructor(nativeModule: Object) { constructor(nativeModule: ?NativeModule) {
super(RCTDeviceEventEmitter.sharedSubscriber); super(RCTDeviceEventEmitter.sharedSubscriber);
if (Platform.OS === 'ios') { if (Platform.OS === 'ios') {
invariant(nativeModule, 'Native module cannot be null.'); invariant(nativeModule, 'Native module cannot be null.');
@ -33,8 +39,12 @@ class NativeEventEmitter extends EventEmitter {
} }
} }
addListener(eventType: string, listener: Function, context: ?Object): EmitterSubscription { addListener(
if (Platform.OS === 'ios') { eventType: string,
listener: Function,
context: ?Object,
): EmitterSubscription {
if (this._nativeModule != null) {
this._nativeModule.addListener(eventType); this._nativeModule.addListener(eventType);
} }
return super.addListener(eventType, listener, context); return super.addListener(eventType, listener, context);
@ -42,15 +52,15 @@ class NativeEventEmitter extends EventEmitter {
removeAllListeners(eventType: string) { removeAllListeners(eventType: string) {
invariant(eventType, 'eventType argument is required.'); invariant(eventType, 'eventType argument is required.');
if (Platform.OS === 'ios') { const count = this.listeners(eventType).length;
const count = this.listeners(eventType).length; if (this._nativeModule != null) {
this._nativeModule.removeListeners(count); this._nativeModule.removeListeners(count);
} }
super.removeAllListeners(eventType); super.removeAllListeners(eventType);
} }
removeSubscription(subscription: EmitterSubscription) { removeSubscription(subscription: EmitterSubscription) {
if (Platform.OS === 'ios') { if (this._nativeModule != null) {
this._nativeModule.removeListeners(1); this._nativeModule.removeListeners(1);
} }
super.removeSubscription(subscription); super.removeSubscription(subscription);