Expo项目运行yarn start报错：AppEntry.js出现Unexpected token 'export'

错误信息 #

执行yarn start启动应用时出现以下错误：

Android Bundling failed 449ms
error: node_modules\expo\AppEntry.js: Unexpected token 'export'

相关文件内容 #

App.js #

import React, { useState, useEffect } from "react";
import "react-native-gesture-handler";
import { createNativeStackNavigator } from "@react-navigation/native-stack";
import { NavigationContainer, DefaultTheme } from "@react-navigation/native";
import { onAuthStateChanged } from "firebase/auth";
import { auth } from "./config/firebaseConfig";
import { IntroductionAnimationScreen } from "./introduction_animation";
// screens
import {
  PlantDetail,
  Welcome,
  Signup,
  Login,
  Profile,
  ChatBot,
  Settings,
  ExpertHome,
  CourseList,
  Cources,
} from "./screens";
// Tab Navigator
import Tabs from "./navigation/tabs";
// Font
import { useFonts } from "expo-font";

const theme = {
  ...DefaultTheme,
  colors: {
    ...DefaultTheme.colors,
    border: "transparent",
  },
};

const Stack = createNativeStackNavigator();
const App = () => {
  const [user, setUser] = useState(null);
  useEffect(() => {
    const unsubscribe = onAuthStateChanged(auth, (authUser) => {
      if (authUser) {
        // User is signed in
        setUser(authUser);
      } else {
        // User is signed out
        setUser(null);
      }
    });

    // Unsubscribe from the listener when the component unmounts
    return () => {
      unsubscribe();
    };
  }, []);

  const [loaded] = useFonts({
    "Roboto-Light": require("./assets/fonts/Roboto-Light.ttf"),
    "Roboto-Black": require("./assets/fonts/Roboto-Black.ttf"),
    "Roboto-Bold": require("./assets/fonts/Roboto-Bold.ttf"),
    "Roboto-Regular": require("./assets/fonts/Roboto-Regular.ttf"),
  });

  if (!loaded) {
    return null;
  }

  return (
    <NavigationContainer theme={theme}>
      <Stack.Navigator
        screenOptions={{
          headerShown: false,
        }}
        initialRouteName={user ? "HomeTabs" : "Welcome"}
      >
        {/* Tabs */}
        {user ? (
          <>
            <Stack.Screen name="HomeTabs" component={Tabs} />
            <Stack.Screen
              name="Profile"
              component={Profile}
              options={{ headerShown: false }}
            />
            <Stack.Screen
              name="ChatBot"
              component={ChatBot}
              options={{ headerShown: false }}
            />
            <Stack.Screen
              name="ExpertHome"
              component={ExpertHome}
              options={{ headerShown: false }}
            />
            <Stack.Screen
              name="CourseList"
              component={CourseList}
              options={{ headerShown: false }}
            />

            <Stack.Screen
              name="Cources"
              component={Cources}
              options={{ headerShown: false }}
            />
            <Stack.Screen
              name="IntroductionAnimationScreen"
              component={IntroductionAnimationScreen}
              options={{ headerShown: false }}
            />
            <Stack.Screen
              name="Settings"
              options={{
                headerShown: false,
                cardStyleInterpolator: ({ current, next, layouts }) => {
                  return {
                    cardStyle: {
                      transform: [
                        {
                          translateX: current.progress.interpolate({
                            inputRange: [0, 1],
                            outputRange: [layouts.screen.width, 0],
                          }),
                        },
                      ],
                    },
                    overlayStyle: {
                      opacity: current.progress.interpolate({
                        inputRange: [0, 1],
                        outputRange: [0, 0.5],
                      }),
                    },
                  };
                },
              }}
              component={Settings}
            />
          </>
        ) : (
          <>
            {/* Screens */}
            <Stack.Screen
              name="Welcome"
              component={Welcome}
              options={{ headerShown: false }}
            />
            <Stack.Screen
              name="Signup"
              component={Signup}
              options={{ headerShown: false }}
            />
            <Stack.Screen
              name="Login"
              component={Login}
              options={{ headerShown: false }}
            />
          </>
        )}
        <Stack.Screen
          name="PlantDetail"
          component={PlantDetail}
          options={{ headerShown: false }}
        />
      </Stack.Navigator>
    </NavigationContainer>
  );
};

export default App;

package.json依赖配置 #

{
  "dependencies": {
    "@expo/vector-icons": "^13.0.0",
    "@expo/webpack-config": "^19.0.0",
    "@google-ai/generativelanguage": "^1.1.0",
    "@react-native-async-storage/async-storage": "1.18.2",
    "@react-navigation/bottom-tabs": "^6.5.8",
    "@react-navigation/native": "^6.1.7",
    "@react-navigation/native-stack": "^6.9.13",
    "axios": "^1.5.0",
    "deprecated-react-native-prop-types": "^4.2.1",
    "dotenv": "^16.3.1",
    "expo": "~49.0.5",
    "expo-constants": "~14.4.2",
    "expo-font": "~11.4.0",
    "expo-image-picker": "~14.3.2",
    "expo-linear-gradient": "~12.3.0",
    "expo-status-bar": "~1.6.0",
    "firebase": "^10.3.1",
    "lodash": "^4.17.21",
    "nativewind": "^2.0.11",
    "postcss": "8.4.23",
    "prop-types": "*",
    "react": "18.2.0",
    "react-dom": "18.2.0",
    "react-native": "0.72.5",
    "react-native-gesture-handler": "~2.12.0",
    "react-native-gifted-chat": "^2.4.0",
    "react-native-heroicons": "^3.2.0",
    "react-native-modalize": "^2.1.1",
    "react-native-onboarding-swiper": "^1.2.0",
    "react-native-pager-view": "6.2.0",
    "react-native-progress": "^5.0.0",
    "react-native-progress-circle": "^2.1.0",
    "react-native-reanimated": "^3.5.4",
    "react-native-responsive-screen": "^1.4.2",
    "react-native-safe-area-context": "4.6.3",
    "react-native-screens": "~3.22.0",
    "react-native-splash-screen": "^3.3.0",
    "react-native-svg": "13.9.0",
    "react-native-tab-view": "^3.5.2",
    "react-native-vector-icons": "^10.0.0",
    "react-native-web": "~0.19.6"
  },
  "devDependencies": {
    "@babel/core": "^7.20.0",
    "tailwindcss": "3.3.2",
    "typescript": "^5.1.3"
  }
}

AppEntry.js #

import registerRootComponent from 'expo/build/launch/registerRootComponent';

import App from '../../App';

registerRootComponent(App);

已尝试的解决方案 #

• 删除node_modules后执行yarn install重新安装依赖
• 检查所有文件的import/export语法正确性
• 排查App.js中导入的所有页面组件的导出方式

可行解决方案建议 #

1. 修正项目入口配置
   错误提示指向node_modules/expo/AppEntry.js，说明打包时错误加载了Expo包内的入口文件，而非项目自身的入口。

   • 确认项目根目录存在正确的入口文件（index.js或AppEntry.js），内容应为：

     import { registerRootComponent } from 'expo';
     import App from './App';
     registerRootComponent(App);
     

   • 打开app.json，检查entryPoint字段，确保指向项目自身的入口文件（例如"./App.js"或"./index.js"），若没有该字段则添加。

2. 检查Babel配置
   项目根目录需有babel.config.js，确保配置正确：

   module.exports = function(api) {
     api.cache(true);
     return {
       presets: ['babel-preset-expo'],
     };
   };
   

   若使用TypeScript，检查tsconfig.json的compilerOptions，确保"module": "esnext"、"target": "es6"，保证ES模块语法被正确转译。

3. 清理缓存并重新打包
   执行expo r -c清除Expo缓存，再重新运行yarn start启动项目。

4. 排查依赖冲突

   • 移除可能存在兼容性问题的第三方库，比如react-native-splash-screen（Expo自带闪屏解决方案，第三方库易引发冲突），重新安装依赖后测试。
   • 执行yarn why expo查看Expo依赖版本是否存在冲突，确保所有Expo相关依赖版本与expo ~49.0.5匹配。

内容的提问来源于stack exchange，提问作者Snehasish Konger