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React Native Integration & Best Practices: Global Polyfills

Global Polyfills​

React Native environments differ from standard browser environments. To ensure compatibility with shared libraries (especially those relying on fetch, crypto, or URL), specific polyfills must be loaded at the very beginning of your application entry point (e.g., index.native.ts).

Example: polyfill.ts

import 'react-native-get-random-values';
import 'react-native-url-polyfill/auto';

// Polyfill DOMException for standard error handling (some libraries expect DOMException to exist)
// @ts-ignore
globalThis.DOMException = Error;

// Polyfill AbortController for fetch cancellation
require('abortcontroller-polyfill/dist/abortcontroller-polyfill-only');