code: function offChildAdded(dbRef, dataToCache) {
  		var storageKey = getStorageKeyFromDbRef(dbRef, 'child_added');
  
  		//Turn listener off.
  		dbRef.off();
  
  		return new Promise(function (resolve, reject) {
  			resolve(_reactNative.AsyncStorage.setItem(storageKey, JSON.stringify(dataToCache)));
  		});
  	}
docs: Turn off listeners at a certain database.Reference, and cache the data passed in so that it can be passed to a new "child_added" listener if one is created.
  @param {*} dbRef Reference to stop listening at.
  @param {*} dataToCache Data that should be cached for this location. Tip: [].slice(-20) to keep the latest 20 items.