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React Native Unhandled JS Exception: TypeError for New iOS Project

iOS emulator error

I started getting this error when starting an existing project with react-native run-ios

. To try and figure out if there is something wrong with my project, I ran react-native init EmptyProject

to create an empty project, which should work fine. I am still getting this error even with this.

I have looked into this Stack Overflow question and ran in ./node_modules/react-native/packager/packager.sh start --resetCache

both my existing project and an empty project to no avail. Any clues as to what might be going on?

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After hours of trial and error, I was able to fix this issue. At the moment I don't know what specific thing fixed it, but here are all the main things I did.

  • Updated node to the latest version
  • brew update && brew upgrade

  • brew install watchman

  • Fixed all problems that occurred when using brew doctor

  • rm -rf ./node_modules ios android

  • yarn

  • react-native upgrade

  • Added babel-preset-react-native-stage-0

    as a dev dependency in mypackage.json

  • Added parameter "react-native-stage-0" as preset for my babel.rc

  • ./node_modules/react-native/packager/packager.sh start --resetCache



After all this, my projects were running smoothly without any problems.

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