问获取TypeError:未定义不是一个对象(计算'_mathjs.default.fraction')，React本机

EN

import React from 'react';
import {View, Button} from 'react-native';
import mathjs from 'mathjs';
const App = () => {
  return (
    <View>
      <Button
        title="TestButton"
        onPress={() => {
           console.log(mathjs.fraction(1, 2)); // equals to ½
         }}
        />
   </View>
  );
};

export default App;