Expo Camera开发中CameraType声明但未被读取的问题求助

大家好，我现在碰到一个Expo Camera相关的棘手问题，想请教下各位大佬。我完全照搬Expo Camera官方使用示例写的代码，但一直收到CameraType is declared but never read的提示，而且IDE的快速修复还建议我删掉这个导入项。

我已经试过这些解决办法，但问题还是没解决：

• 执行了npx expo install命令
• 单独执行npx expo install expo-camera安装依赖
• 删除node_modules和package-lock.json后重新安装所有依赖

以下是我的完整代码：

import { CameraView, CameraType, useCameraPermissions } from 'expo-camera';
import { useState } from 'react';
import { Button, StyleSheet, Text, TouchableOpacity, View } from 'react-native';

export default function App() {
  const [facing, setFacing] = useState<CameraType>('back');
  const [permission, requestPermission] = useCameraPermissions();

  if (!permission) {
    // Camera permissions are still loading.
    return <View />;
  }
  if (!permission.granted) {
    // Camera permissions are not granted yet.
    return (
      <View style={styles.container}>
        <Text style={styles.message}>We need your permission to show the camera</Text>
        <Button onPress={requestPermission} title="grant permission" />
      </View>
    );
  }

  function toggleCameraFacing() {
    setFacing(current => (current === 'back' ? 'front' : 'back'));
  }

  return (
    <View style={styles.container}>
      <CameraView style={styles.camera} facing={facing}>
        <View style={styles.buttonContainer}>
          <TouchableOpacity style={styles.button} onPress={toggleCameraFacing}>
            <Text style={styles.text}>Flip Camera</Text>
          </TouchableOpacity>
        </View>
      </CameraView>
    </View>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: 'center',
  },
  message: {
    textAlign: 'center',
    paddingBottom: 10,
  },
  camera: {
    flex: 1,
  },
  buttonContainer: {
    flex: 1,
    flexDirection: 'row',
    backgroundColor: 'transparent',
    margin: 64,
  },
  button: {
    flex: 1,
    alignSelf: 'flex-end',
    alignItems: 'center',
  },
  text: {
    fontSize: 24,
    fontWeight: 'bold',
    color: 'white',
  },
});

我明明在useState里用了CameraType作为类型注解，为什么还会提示它未被读取呢？有没有遇到过类似问题的朋友能帮忙分析下原因，或者给点解决思路？

内容来源于stack exchange