React Native SDK

import { useEffect } from 'react';
import {
  AutoEnvAttributes,
  LDProvider,
  ReactNativeLDClient,
} from '@launchdarkly/react-native-client-sdk';

const mobileKey = process.env.EXPO_PUBLIC_LAUNCHDARKLY_MOBILE_KEY?.trim();
if (!mobileKey) {
  throw new Error(
    'LaunchDarkly: missing mobile key. For Expo, set EXPO_PUBLIC_LAUNCHDARKLY_MOBILE_KEY. For bare React Native, inject the key (for example react-native-config) and pass it here.',
  );
}

const ldClient = new ReactNativeLDClient(mobileKey, AutoEnvAttributes.Enabled, {
  debug: true,
  applicationInfo: {
    id: 'ld-rn-test-app',
    version: '0.0.1',
  },
});

// A "context" is a data object representing users, devices, organizations, and other entities.
const context = { kind: 'user', key: 'EXAMPLE_CONTEXT_KEY' };

const App = () => {
  useEffect(() => {
    ldClient.identify(context).catch((e: unknown) => {
      console.error('LaunchDarkly identify failed:', e);
    });
  }, []);

  return (
    <LDProvider client={ldClient}>
      <YourComponent />
    </LDProvider>
  );
};

export default App;