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GitHub Issue for react-native-reanimated

Title

App crashes silently when using fetch() inside worklet runtime

Description

When calling fetch() inside a worklet runtime created with react-native-worklets, the app crashes immediately without printing any error messages to the console. This makes it impossible to debug what's going wrong.

Environment

  • Expo SDK: 54.0.25
  • React Native: 0.81.5
  • react-native-reanimated: ~4.1.1
  • react-native-worklets: 0.6.1
  • React: 19.1.0
  • Platform: Android/iOS (tested on physical device)

Steps to Reproduce

  1. Clone the reproduction repository: [link to be added]
  2. Install dependencies: npm install
  3. Run on device: npx expo run:android or npx expo run:ios
  4. App crashes immediately on load

Code

import { createWorkletRuntime, scheduleOnRuntime } from 'react-native-worklets';

function testWorkletFetch() {
  const fetchRuntime = createWorkletRuntime({ name: 'fetchRuntime' });
  scheduleOnRuntime(fetchRuntime, () => {
    'worklet';

    console.log('[Worklet Fetch] Starting fetch test...');

    fetch('https://jsonplaceholder.typicode.com/todos/1', {
      method: 'GET',
    })
      .then((data) => {
        console.log('[Worklet Fetch] Success:', data);
      })
      .catch((error) => {
        console.error('[Worklet Fetch] Error:', error.message);
      });
  });
}

Expected Behavior

The fetch request should either:

  • Complete successfully and log the response
  • Fail with a proper error message that can be caught and logged

Actual Behavior

The app crashes silently without any error output in the console. The crash happens immediately when the worklet attempts to execute the fetch call.

Additional Context

  • The same fetch call works fine when executed in the main JS thread
  • No error messages appear in Metro bundler, Logcat, or Xcode console
  • The initial console.log('[Worklet Fetch] Starting fetch test...') does not appear, suggesting the crash happens before or during the fetch call

Reproduction Repository

A minimal reproduction is available at: [repository link]

Question

Is fetch() supposed to be supported in worklet runtimes? If not, what's the recommended way to make network requests from within a worklet?