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

Can you provide a minimal reproducible example for this? That would help us narrow down the issue better.

Seems like a error in your code. Can you provide a screenshot of console with Debug JS Remotely?

@Steffi3rd

Hey @Steffi3rd, I suspect that there's actually an issue in your project's code. I think if you look at Metro, you'll see a build-time error.

A few tips:

Try resetting all of the caches with:

 watchman watch-del-all && rm -rf $TMPDIR/react-native-packager-cache-* && rm -rf $TMPDIR/metro-bundler-cache-* && rm -rf node_modules/ && npm cache clean --force && npm install && npm start -- --reset-cache

Go ahead and upgrade to 0.59.1

Without a repository of your source, it's hard to give specific advice. This seems like an environment issue, but please do follow up with more detail if my pointers above don't help.

Thanks for your anwser, I did this :

watchman watch-del-all && rm -rf $TMPDIR/react-native-packager-cache-* && rm -rf $TMPDIR/metro-bundler-cache-* && rm -rf node_modules/ && npm cache clean --force && npm install && npm start -- --reset-cache

Now the error has changed but similar.
I don't any details on "Extra Info"

It works very well on Simulator.
Metro bundler is build fine
Xcode project build success

Having the same issue.. Cant see whats causing this nonsense.. Metro running fine, everything compiles.. Upon app launch this error comes up with no indication.. Nothing in the console either..

Got the same error. Renaming root index.js to index.ios.js did the trick for me. But I'm not sure what is the real issue here

Upgrading to these versions seems to have fixed this issue for me on react-native v0.59.8

package.json

   "devDependencies": {
-    "@babel/core": "^7.4.4",
-    "@babel/runtime": "^7.4.4",
+    "@babel/core": "^7.4.5",
+    "@babel/runtime": "^7.4.5",
@@ -101,7 +101,7 @@
-    "metro-react-native-babel-preset": "^0.54.0",
+    "metro-react-native-babel-preset": "^0.54.1",

I'm closing this issue since no repro was provided.

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

I had a similar issue with error Unhandled JS Exception: Unexpected identifier 'App'. import call expects exactly one argument. no stack

So the problem is apparently import App from './App';

I had several code blocks and reminders commented out above it, removing all these comments then the build is successful. So I suggest you to check your import methods.

Also, be careful when comment out code in RN in general, especially within render function. Hope it's helpful.

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

same issue

Windows 10 - Android

info React Native Environment Info: System: OS: Windows 10 CPU: (8) x64 Intel(R) Core(TM) i5-8250U CPU @ 1.60GHz Memory: 1.19 GB / 7.91 GB Binaries: Node: 10.16.3 - C:\kafka\setting\node\node.EXE Yarn: 1.19.1 - C:\kafka\setting\yarn\bin\yarn.CMD npm: 6.9.0 - C:\kafka\setting\node\npm.CMD
same issue

I fixed this problem by deleting the entire babel.config.js for the time being and letting react-native handle babel

If this helps anyone I had the same issue and this helped me solve it. #21530 (comment)

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Unhandled JS Exception: Unexpected token '{'. import call expects exactly one argument. no stack #24094

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Unhandled JS Exception: Unexpected token '{'. import call expects exactly one argument. no stack #24094

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karanjthakkar commented on Mar 21, 2019

Gerlison commented on Mar 22, 2019

turnrye commented on Mar 22, 2019

Steffi3rd commented on Mar 22, 2019

SourceCipher commented on May 12, 2019

MaxBabenko commented on May 23, 2019

gianpaj commented on May 24, 2019

satya164 commented on May 30, 2019

jeffreyhaen commented on Jun 13, 2019

unmec commented on Sep 11, 2019

unmec commented on Sep 11, 2019

ghasemikasra39 commented on Oct 5, 2019

wuweijian1997 commented on Oct 24, 2019

ajGingrich commented on Oct 27, 2019

wonga151 commented on Feb 9, 2020

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