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Worklet Fetch Crash Reproduction

Minimal reproduction for an issue where using fetch() inside a worklet runtime causes the app to crash without printing any error.

Environment

  • Expo SDK: 54.0.22
  • React Native: 0.81.5
  • react-native-reanimated: ~4.1.1
  • react-native-worklets: 0.6.1
  • React: 19.1.0

Issue Description

When calling fetch() inside a worklet runtime created with react-native-worklets, the app crashes immediately without any error message in the console.

Steps to Reproduce

  1. Install dependencies:

    npm install

  2. Run on device:

    npx expo run:android
# or
npx expo run:ios

  3. Observe the crash when the app loads

Expected Behavior

The fetch request should either:

  • Complete successfully and log the response
  • Fail with an error that is caught and logged

Actual Behavior

The app crashes silently without any error output.

Code

See App.tsx for the minimal reproduction case. The issue occurs in the testWorkletFetch() function which:

  1. Creates a worklet runtime
  2. Schedules a worklet that calls fetch()
  3. Crashes without printing any error

Notes

This same code pattern works fine in the main JS thread but fails when executed in a worklet runtime.