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isPrefixed=_ExecutionEnvironment.canUseDOM&&!document.hasOwnProperty('hidden')&&document.hasOwnProperty('webkitHidden');var EVENT_TYPES=['change','memoryWarning'];var VISIBILITY_CHANGE_EVENT=isPrefixed?'webkitvisibilitychange':'visibilitychange';var VISIBILITY_STATE_PROPERTY=isPrefixed?'webkitVisibilityState':'visibilityState';var AppStates={BACKGROUND:'background',ACTIVE:'active'};var listeners=[];var AppState=function(){function AppState(){}AppState.addEventListener=function addEventListener(type,handler){if(AppState.isAvailable){(0,_invariant.default)(EVENT_TYPES.indexOf(type)!==-1,'Trying to subscribe to unknown event: \"%s\"',type);if(type==='change'){var callback=function callback(){return handler(AppState.currentState);};listeners.push([handler,callback]);document.addEventListener(VISIBILITY_CHANGE_EVENT,callback,false);}}};AppState.removeEventListener=function removeEventListener(type,handler){if(AppState.isAvailable){(0,_invariant.default)(EVENT_TYPES.indexOf(type)!==-1,'Trying to remove listener for unknown event: \"%s\"',type);if(type==='change'){var listenerIndex=(0,_arrayFindIndex.default)(listeners,function(pair){return pair[0]===handler;});(0,_invariant.default)(listenerIndex!==-1,'Trying to remove AppState listener for unregistered handler');var callback=listeners[listenerIndex][1];document.removeEventListener(VISIBILITY_CHANGE_EVENT,callback,false);listeners.splice(listenerIndex,1);}}};_createClass(AppState,null,[{key:\"currentState\",get:function get(){if(!AppState.isAvailable){return AppStates.ACTIVE;}switch(document[VISIBILITY_STATE_PROPERTY]){case'hidden':case'prerender':case'unloaded':return AppStates.BACKGROUND;default:return AppStates.ACTIVE;}}}]);return 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