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This is only temporary — in the future\n // JSI modules will have event emitter built in.\n if (nativeModule.__expo_module_name__ && NativeModules.EXReactNativeEventEmitter) {\n nativeModule.addListener = (...args) =>\n NativeModules.EXReactNativeEventEmitter.addProxiedListener(\n nativeModule.__expo_module_name__,\n ...args\n );\n nativeModule.removeListeners = (...args) =>\n NativeModules.EXReactNativeEventEmitter.removeProxiedListeners(\n nativeModule.__expo_module_name__,\n ...args\n );\n }\n this._nativeModule = nativeModule;\n this._eventEmitter = new NativeEventEmitter(nativeModule as any);\n }\n\n addListener<T>(eventName: string, listener: (event: T) => void): Subscription {\n if (!this._listenerCount && Platform.OS !== 'ios' && this._nativeModule.startObserving) {\n this._nativeModule.startObserving();\n }\n\n this._listenerCount++;\n const nativeEmitterSubscription = this._eventEmitter.addListener(eventName, listener);\n const subscription = {\n [nativeEmitterSubscriptionKey]: nativeEmitterSubscription,\n remove: () => {\n this.removeSubscription(subscription);\n },\n };\n return subscription;\n }\n\n removeAllListeners(eventName: string): void {\n // @ts-ignore: the EventEmitter interface has been changed in [email protected]\n const removedListenerCount = this._eventEmitter.listenerCount\n ? // @ts-ignore: this is available since 0.64\n this._eventEmitter.listenerCount(eventName)\n : // @ts-ignore: this is available in older versions\n this._eventEmitter.listeners(eventName).length;\n this._eventEmitter.removeAllListeners(eventName);\n this._listenerCount -= removedListenerCount;\n invariant(\n this._listenerCount >= 0,\n `EventEmitter must have a non-negative number of listeners`\n );\n\n if (!this._listenerCount && Platform.OS !== 'ios' && this._nativeModule.stopObserving) {\n this._nativeModule.stopObserving();\n }\n }\n\n removeSubscription(subscription: Subscription): void {\n const nativeEmitterSubscription = subscription[nativeEmitterSubscriptionKey];\n if (!nativeEmitterSubscription) {\n return;\n }\n\n if ('remove' in nativeEmitterSubscription) {\n // `[email protected]` doesn't support `removeSubscription`\n nativeEmitterSubscription.remove();\n } else if ('removeSubscription' in this._eventEmitter) {\n this._eventEmitter.removeSubscription(nativeEmitterSubscription!);\n }\n this._listenerCount--;\n\n // Ensure that the emitter's internal state remains correct even if `removeSubscription` is\n // called again with the same subscription\n delete subscription[nativeEmitterSubscriptionKey];\n\n // Release closed-over references to the emitter\n subscription.remove = () => {};\n\n if (!this._listenerCount && Platform.OS !== 'ios' && this._nativeModule.stopObserving) {\n this._nativeModule.stopObserving();\n }\n }\n\n emit(eventName: string, ...params: any[]): void {\n this._eventEmitter.emit(eventName, ...params);\n }\n}\n"]}