| 1 | {"version":3,"file":"EventEmitter.js","sourceRoot":"","sources":["../src/EventEmitter.ts"],"names":[],"mappings":"AAAA,OAAO,SAAS,MAAM,WAAW,CAAC;AAClC,OAAO,EAAE,kBAAkB,EAAE,QAAQ,EAAE,MAAM,cAAc,CAAC;AAE5D,MAAM,4BAA4B,GAAG,+BAA+B,CAAC;AAarE,MAAM,OAAO,YAAY;IAKvB,YAAY,YAA0B;QAJtC,mBAAc,GAAG,CAAC,CAAC;QAKjB,IAAI,CAAC,aAAa,GAAG,YAAY,CAAC;QAClC,IAAI,CAAC,aAAa,GAAG,IAAI,kBAAkB,CAAC,YAAmB,CAAC,CAAC;IACnE,CAAC;IAED,WAAW,CAAI,SAAiB,EAAE,QAA4B;QAC5D,IAAI,CAAC,IAAI,CAAC,cAAc,IAAI,QAAQ,CAAC,EAAE,KAAK,KAAK,IAAI,IAAI,CAAC,aAAa,CAAC,cAAc,EAAE;YACtF,IAAI,CAAC,aAAa,CAAC,cAAc,EAAE,CAAC;SACrC;QAED,IAAI,CAAC,cAAc,EAAE,CAAC;QACtB,MAAM,yBAAyB,GAAG,IAAI,CAAC,aAAa,CAAC,WAAW,CAAC,SAAS,EAAE,QAAQ,CAAC,CAAC;QACtF,MAAM,YAAY,GAAG;YACnB,CAAC,4BAA4B,CAAC,EAAE,yBAAyB;YACzD,MAAM,EAAE,GAAG,EAAE;gBACX,IAAI,CAAC,kBAAkB,CAAC,YAAY,CAAC,CAAC;YACxC,CAAC;SACF,CAAC;QACF,OAAO,YAAY,CAAC;IACtB,CAAC;IAED,kBAAkB,CAAC,SAAiB;QAClC,MAAM,oBAAoB,GAAG,IAAI,CAAC,aAAa,CAAC,SAAS,CAAC,SAAS,CAAC,CAAC,MAAM,CAAC;QAC5E,IAAI,CAAC,aAAa,CAAC,kBAAkB,CAAC,SAAS,CAAC,CAAC;QACjD,IAAI,CAAC,cAAc,IAAI,oBAAoB,CAAC;QAC5C,SAAS,CACP,IAAI,CAAC,cAAc,IAAI,CAAC,EACxB,2DAA2D,CAC5D,CAAC;QAEF,IAAI,CAAC,IAAI,CAAC,cAAc,IAAI,QAAQ,CAAC,EAAE,KAAK,KAAK,IAAI,IAAI,CAAC,aAAa,CAAC,aAAa,EAAE;YACrF,IAAI,CAAC,aAAa,CAAC,aAAa,EAAE,CAAC;SACpC;IACH,CAAC;IAED,kBAAkB,CAAC,YAA0B;QAC3C,MAAM,yBAAyB,GAAG,YAAY,CAAC,4BAA4B,CAAC,CAAC;QAC7E,IAAI,CAAC,yBAAyB,EAAE;YAC9B,OAAO;SACR;QAED,IAAI,CAAC,aAAa,CAAC,kBAAkB,CAAC,yBAA0B,CAAC,CAAC;QAClE,IAAI,CAAC,cAAc,EAAE,CAAC;QAEtB,2FAA2F;QAC3F,0CAA0C;QAC1C,OAAO,YAAY,CAAC,4BAA4B,CAAC,CAAC;QAElD,gDAAgD;QAChD,YAAY,CAAC,MAAM,GAAG,GAAG,EAAE,GAAE,CAAC,CAAC;QAE/B,IAAI,CAAC,IAAI,CAAC,cAAc,IAAI,QAAQ,CAAC,EAAE,KAAK,KAAK,IAAI,IAAI,CAAC,aAAa,CAAC,aAAa,EAAE;YACrF,IAAI,CAAC,aAAa,CAAC,aAAa,EAAE,CAAC;SACpC;IACH,CAAC;IAED,IAAI,CAAC,SAAiB,EAAE,GAAG,MAAa;QACtC,IAAI,CAAC,aAAa,CAAC,IAAI,CAAC,SAAS,EAAE,GAAG,MAAM,CAAC,CAAC;IAChD,CAAC;CACF","sourcesContent":["import invariant from 'invariant';\nimport { NativeEventEmitter, Platform } from 'react-native';\n\nconst nativeEmitterSubscriptionKey = '@@nativeEmitterSubscription@@';\n\ntype NativeModule = {\n startObserving?: () => void;\n stopObserving?: () => void;\n addListener: (eventName: string) => void;\n removeListeners: (count: number) => void;\n};\n\nexport type Subscription = {\n remove: () => void;\n};\n\nexport class EventEmitter {\n _listenerCount = 0;\n _nativeModule: NativeModule;\n _eventEmitter: NativeEventEmitter;\n\n constructor(nativeModule: NativeModule) {\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 const removedListenerCount = 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 this._eventEmitter.removeSubscription(nativeEmitterSubscription!);\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"]} |