React-Native无法读取null的属性 'bindings'

Question

我尝试运行一个 react native 模拟器。

但是，在模拟器中出现了这个错误:

Failed to load bundle(http://localhost:8081/index.bundle?
platform=ios&dev=true&minify=false) 
with error:(/Users/sugawarasyuta/Desktop/albums/index.js:
Cannot read property 'bindings' of null(null))

我仔细检查了我的代码语法。但我觉得这不是那个。你知道如何解决这个错误吗？

这是我的文件:

index.js

import React from 'react';
import { AppRegistry,View } from 'react-native';
import Header from './src/components/header';
import AlbumList from './src/components/AlbumList';


//Create a component
const App = () => (
<View>
<Header headerText= {'albums'} />
<AlbumList />
</View>
);

AppRegistry.registerComponent('albums', () => App );

AlbumList.js

import React,{Component}from 'react';
import {View, Text} from 'react-native';
import axios from 'axios';

class AlbumList extends Component {

componentWillMount(){
    axios.get('https://rallycoding.herokuapp.com/api/music_albums')
    .then(response => console.log(response));

}
render(){
return(
    <View>
        <Text>AlbumList!!!</Text>
    </View>
    );
}
}
export default AlbumList;

这些是最终语句:

/usr/bin/codesign --force --sign - --entitlements /Users/sugawarasyuta/Desktop/albums/ios/build/Build/Intermediates.noindex/albums.build/Debug-iphonesimulator/albums.build/albums.app.xcent --timestamp=none /Users/sugawarasyuta/Desktop/albums/ios/build/Build/Products/Debug-iphonesimulator/albums.app

/Users/sugawarasyuta/Desktop/albums/ios/build/Build/Products/Debug-iphonesimulator/albums.app: resource fork, Finder information, or similar detritus not allowed

Command /usr/bin/codesign failed with exit code 1



** BUILD FAILED **


The following build commands failed:

    CodeSign build/Build/Products/Debug-iphonesimulator/albums.app
(1 failure)

Installing build/Build/Products/Debug-iphonesimulator/albums.app
Launching org.reactjs.native.example.albums
org.reactjs.native.example.albums: 8385

这是我的package.json。这些依赖关系正确吗？

{
"name": "albums",  
"version": "0.0.1",

"private": true,

"scripts": {
 "start": "node node_modules/react-native/local-cli/cli.js start",
    "test": "jest"
  },


  "dependencies": {

"axios": "^0.18.0",

"babel-plugin-transform-es2015-arrow-functions": "^6.22.0",

"react": "16.3.1",

"react-native": "^0.56.0"

 },

"devDependencies": {

"@babel/preset-env": "^7.0.0-beta.53",

"babel-jest": "23.0.1",

"babel-preset-es2015": "^6.24.1",

 "babel-preset-react-native": "4.0.0",

"eslint-config-rallycoding": "^3.2.0",

 "jest": "23.1.0",

"react-test-renderer": "16.3.1"

},

"jest": {

 "preset": "react-native"

 }

}

我将 "babel-preset-react-native" 从 "4.0.0" 升级到 "^5.0.1" 和另一个错误出来了:

error: bundling failed: SyntaxError: 
/Users/sugawarasyuta/Desktop/albums/index.js: Unexpected token (11:3)



  10 | const App = () => {

> 11 |    <Header headerText= {'albums'} />

     |    ^

  12 | 

  13 | };



at Parser.raise

(/Users/sugawarasyuta/Desktop/albums/node_modules
/@babel/core/node_modules/babylon/lib/index.js:776:15)

at Parser.unexpected    
(/Users/sugawarasyuta/Desktop/albums/node_modules/
@babel/core/node_modules/babylon/lib/index.js:2079:16)

at Parser.parseExprAtom (/Users/sugawarasyuta/Desktop/albums/node_modules/@babel/core/node_modules/babylon/lib/index.js:3157:20)

at Parser.parseExprSubscripts (/Users/sugawarasyuta/Desktop/albums/node_modules/@babel/core/node_modules/babylon/lib/index.js:2757:21)

at Parser.parseMaybeUnary (/Users/sugawarasyuta/Desktop/albums/node_modules/@babel/core/node_modules/babylon/lib/index.js:2736:21)

at Parser.parseExprOps (/Users/sugawarasyuta/Desktop/albums/node_modules/@babel/core/node_modules/babylon/lib/index.js:2643:21)

at Parser.parseMaybeConditional (/Users/sugawarasyuta/Desktop/albums/node_modules/@babel/core/node_modules/babylon/lib/index.js:2615:21)

at Parser.parseMaybeAssign (/Users/sugawarasyuta/Desktop/albums/node_modules/@babel/core/node_modules/babylon/lib/index.js:2562:21)

at Parser.parseExpression (/Users/sugawarasyuta/Desktop/albums/node_modules/@babel/core/node_modules/babylon/lib/index.js:2515:21)

at Parser.parseStatementContent (/Users/sugawarasyuta/Desktop/albums/node_modules/@babel/core/node_modules/babylon/lib/index.js:4076:21)
 BUNDLE  [ios, dev] ../../index.js ░░░░░░░░░░░░░░░░ 0.0% (0/1), failed.

我觉得这不仅仅是因为语法错误，而是依赖关系的原因。你知道我该如何解决它吗？

Answer 1

在没有任何进一步信息的情况下，我怀疑您需要更新 babel-preset-react-native。

When upgrading to 0.56, make sure to bump your babel-preset-react-native package.json dependency to ^5.0.1 or newer.

https://github.com/facebook/react-native/releases