Unhandled JS Exception: Unexpected token '{'. import call expects exactly one argument. no stack

Everything’s work fine until I build my project on Xcode to see my app on real device…

Everything is build fine with no errors, yarn start and Xcode Play button (for build)

$ react-native info
info 
  React Native Environment Info:
    System:
      OS: macOS 10.14.1
      CPU: (8) x64 Intel(R) Core(TM) i5-8259U CPU @ 2.30GHz
      Memory: 170.70 MB / 8.00 GB
      Shell: 3.2.57 - /bin/bash
    Binaries:
      Node: 11.10.0 - /usr/local/bin/node
      Yarn: 1.13.0 - /usr/local/bin/yarn
      npm: 6.7.0 - /usr/local/bin/npm
      Watchman: 4.9.0 - /usr/local/bin/watchman
    SDKs:
      iOS SDK:
        Platforms: iOS 12.1, macOS 10.14, tvOS 12.1, watchOS 5.1
    IDEs:
      Xcode: 10.1/10B61 - /usr/bin/xcodebuild
    npmPackages:
      react: 16.8.3 => 16.8.3 
      react-native: 0.59.0 => 0.59.0

[jeffreyhaen]

I’m having the same issue after upgrading to RN 0.59.9. The error message gives basically no clue what’s wrong…

[unmec]

UPDATE

OK here is the digest of a few good hours spent:

In your index.js, there is something like this:

import { name as appName } from './app.json';
AppRegistry.registerComponent(appName, () => App);

Which import the name from app.json

{
  "name": "yourAppName",
  "displayName": "yourAppName"
}

To get rid of this error, just change index.js to:

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

and stop importing that json file.

You can keep all your present settings in devDependencies