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   return e[k];\n        }\n      });\n    });\n    n.default = e;\n    return n;\n  }\n  exports.useBackButton = useBackButton;\n  var _react = require(_dependencyMap[0], \"react\");\n  var React = _interopNamespace(_react);\n  var _reactNative = require(_dependencyMap[1], \"react-native\");\n  function useBackButton(ref) {\n    React.useEffect(() => {\n      var subscription = _reactNative.BackHandler.addEventListener('hardwareBackPress', () => {\n        var navigation = ref.current;\n        if (navigation == null) {\n          return false;\n        }\n        if (navigation.canGoBack()) {\n          navigation.goBack();\n          return true;\n        }\n        return false;\n      });\n      return () => subscription.remove();\n    }, [ref]);\n  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