Setup for React Native app on Android and iOS

[Ricardo-MT]

When using this library to implement a XMPP client for a React Native app, I can just make it work by overriding the crypto namespace and making sure randomUUID exists with a custom implementation, all this in index.js before booting up the app like this:

// root/index.js

import 'react-native-get-random-values';
import { AppRegistry } from 'react-native';
import App from './App';
import { name as appName } from './app.json';

// Ensure global.crypto exists
if (typeof global.crypto !== 'object') {
global.crypto = {};
}

// Ensure getRandomValues exists (react-native-get-random-values provides it)
if (typeof global.crypto.getRandomValues !== 'function') {
// safety: import again if needed
require('react-native-get-random-values');
}

// Polyfill randomUUID for RN
if (typeof global.crypto.randomUUID !== 'function') {
global.crypto.randomUUID = () => {
const buf = new Uint8Array(16);
global.crypto.getRandomValues(buf);
// Per RFC 4122 §4.4 (version 4)
buf[6] = (buf[6] & 0x0f) | 0x40;
buf[8] = (buf[8] & 0x3f) | 0x80;
const hex = [...buf].map(b => b.toString(16).padStart(2, '0')).join('');
return ${hex.slice(0,8)}-${hex.slice(8,12)}-${hex.slice(12,16)}-${hex.slice(16,20)}-${hex.slice(20)};
};
}
AppRegistry.registerComponent(appName, () => App);

Is there a better way of using this package for React Native mobile apps?

Thanks!