Code Quiz

Bridge Async vs JSI Sync Calls

A native call assumed to be synchronous exposes the core difference between the legacy bridge and JSI-powered New Architecture.

Codejavascript

import { NativeModules } from 'react-native';

const { DeviceInfo } = NativeModules;

// Legacy bridge-based native module
function isBatteryHealthy() {
  const level = DeviceInfo.getBatteryLevel();
  return level > 0.2;
}

if (isBatteryHealthy()) {
  startBackgroundSync();
}

This code always skips the background sync even on a fully charged device. What is the bug?

Next →Bridge vs New Architecture Communication