在 app.json 中定义 expo entryPoint 不起作用

Question

我正在构建一个 React-Native android 应用程序。我想将 App.js 文件移动到 src 文件夹以获得更清晰的文件结构，因此我将此行添加到 expo 对象内的 app.json 文件中：

{
  "expo": {
    "entryPoint": "./src/App.js",

当我运行应用程序时，我会得到相同的旧默认 expo 应用程序。我在文件中有什么并不重要。当我更改任何内容时，它会引发此错误：

Unable to resolve "../../App" from "node_modules/expo/AppEntry.js"

我还尝试按照建议将这一行添加到文件中 here:

export default Expo.registerRootComponent(App);

我正在使用 Linux 和 android studio 模拟器。

Answer 1

每当我尝试这样做时，对我有用的就是导入 registerRootComponent 并以下列方式使用它：

这里是一个很简单的App.js

import React from 'react';
import { Text, View, StyleSheet } from 'react-native';
import { registerRootComponent } from 'expo'; // import it explicitly

class App extends React.Component {
  render () {
    return (
      <View style={styles.container}>
        <Text>Hello</Text>
      </View>
    );
  }
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: 'center',
    alignItems: 'center',
    backgroundColor: 'white'
  }
});

export default registerRootComponent(App); // this is how I register the App component

这是我的app.json

{
  "expo": {
    "entryPoint": "./src/App.js", <---- notice my entry point
    "name": "ExpoTester",
    "slug": "ExpoTester",
    "privacy": "public",
    "sdkVersion": "32.0.0",
    "platforms": [
      "ios",
      "android"
    ],
    "version": "1.0.0",
    "orientation": "portrait",
    "icon": "./assets/icon.png",
    "splash": {
      "image": "./assets/splash.png",
      "resizeMode": "contain",
      "backgroundColor": "#ffffff"
    },
    "updates": {
      "fallbackToCacheTimeout": 0
    },
    "assetBundlePatterns": [
      "**/*"
    ],
    "ios": {
      "supportsTablet": true
    }
  }
}

这是我的package.json

{
  "name": "NewApp",
  "version": "0.0.0",
  "description": "No description",
  "author": null,
  "private": true,
  "main": "node_modules/expo/AppEntry.js",
  "dependencies": {
    "expo": "^32.0.0",
    "react": "16.5.0",
    "react-native": "https://github.com/expo/react-native/archive/sdk-32.0.0.tar.gz"
  }
}

这是我的文件结构：

├── app.json
├── assets
│   ├── icon.png
│   └── splash.png
├── package-lock.json
├── package.json
└── src
    └── App.js <- notice the App.js is no longer in the root directory it is now in src

此外，当对应用程序的结构进行任何重大更改时，我喜欢关闭捆绑程序，然后使用 expo start -c 重新启动它，以确保清理缓存。

Answer 2

好吧，对于那些遇到此错误的人：

[Unhandled promise rejection: Error: Unable to activate keep awake].

基于上面Andrew提供的this和answer，我找到了一种新的方法来实现重组。

这是我的结构：

.expo
  |- many_files
.expo-shared
  |- many_files
assests
  |- many_files
node_modules
src
  |- App.tsx
app.json
package.json
... (many more)

这是我的package.json：

{
  "main": "./src/App.tsx",
  "scripts": {
    "start": "expo start",
    "android": "expo start --android",
    "ios": "expo start --ios",
    "web": "expo start --web",
    "eject": "expo eject"
  },
  "dependencies": {
    "expo": "~41.0.1",
    "expo-status-bar": "~1.0.4",
    "react": "16.13.1",
    "react-dom": "16.13.1",
    "react-native": "https://github.com/expo/react-native/archive/sdk-41.0.0.tar.gz",
    "react-native-web": "~0.13.12"
  },
  "devDependencies": {
    "@babel/core": "^7.9.0",
    "@types/react": "~16.9.35",
    "@types/react-native": "~0.63.2",
    "typescript": "~4.0.0"
  },
  "private": true
}

我的app.json：

{
  "expo": {
    "entryPoint": "./src/App.tsx",
    "name": "front",
    "slug": "front",
    "version": "1.0.0",
    "orientation": "portrait",
    "icon": "./assets/icon.png",
    "splash": {
      "image": "./assets/splash.png",
      "resizeMode": "contain",
      "backgroundColor": "#ffffff"
    },
    "updates": {
      "fallbackToCacheTimeout": 0
    },
    "assetBundlePatterns": [
      "**/*"
    ],
    "ios": {
      "supportsTablet": true
    },
    "android": {
      "adaptiveIcon": {
        "foregroundImage": "./assets/adaptive-icon.png",
        "backgroundColor": "#FFFFFF"
      }
    },
    "web": {
      "favicon": "./assets/favicon.png"
    }
  }
}

最后，我的App.tsx：

import React from 'react'
import { StyleSheet, Text, View } from 'react-native'
import { StatusBar } from 'expo-status-bar'
import { registerRootComponent } from 'expo'

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: '#fff',
    alignItems: 'center',
    justifyContent: 'center'
  }
})

const App = () => {
  return (
    <View style={styles.container}>
      <Text>Open up App.tsx to start working on your app!</Text>
      <StatusBar style='auto' />
    </View>
  )
}

export default registerRootComponent(App)