react-native: Bundlejs error on release build

• Review the documentation: https://facebook.github.io/react-native
• Search for existing issues: https://github.com/facebook/react-native/issues
• Use the latest React Native release: https://github.com/facebook/react-native/releases

Note: I’ve gone through other issues but it doesn’t seem like they are getting the same error.

Environment

Environment: OS: macOS High Sierra 10.13.4 Node: 9.11.1 Yarn: Not Found npm: 5.6.0 Watchman: 4.9.1 Xcode: Xcode 9.2 Build version 9C40b Android Studio: Not Found

• Also using Xcode 9.4

Packages: (wanted => installed) react: ^16.3.1 => 16.3.1 react-native: ^0.55.4 => 0.55.4

Description

For some reason I am getting the following error when building a release version of my application via react-native.

*** Terminating app due to uncaught exception ‘RCTFatalException: Unhandled JS Exception: t.typeof is not a function. (In ‘t.typeof(“function”==typeof Symbol?Symbol.iterator:“@@iterator”)’, ‘t.typeof’ is undefined) (/Users/…/THEAPP.app/main.jsbundle:11)’, reason: 'Unhandled JS Exception: t.typeof is not a function. (In ‘t.typeof("function…’

I have tried the following:

1. Making bundle by editing the Scheme to be a Release bundle
2. Export a bundle myself by using the following: react-native bundle --entry-file index.js --platform ios --dev false --bundle-output ios/main.jsbundle --assets-dest ios

I get the same error for both of these. And of course, this is after I change my AppDelegate.m to the following:

//jsCodeLocation = [[RCTBundleURLProvider sharedSettings] jsBundleURLForBundleRoot:@"index" fallbackResource:nil];
jsCodeLocation = [[NSBundle mainBundle] URLForResource:@"main" withExtension:@"jsbundle"];