detect-bundler

import { isBrowser, isReactNative } from 'detect-bundler'; // This code demonstrates how to use the build-time detection flags. // The values of isBrowser and isReactNative are determined by your bundler // and package.json 'browser' field configuration at build-time. // They are static constants in the final bundled output. if (isBrowser) { console.log('Running in a browser environment (detected at build time).'); // Perform browser-specific initialization, e.g., accessing DOM // document.body.classList.add('is-browser'); } else if (isReactNative) { console.log('Running in a React Native environment (detected at build time).'); // Perform React Native-specific initialization // import { Platform } from 'react-native'; // if (Platform.OS === 'ios') { /* ... */ } } else { console.log('Running in a Node.js-like or other environment.'); // Perform Node.js or universal initialization console.log(`Current environment variable example: ${process.env.NODE_ENV ?? 'undefined'}`); } // Example of conditional export based on detection export const platformSpecificMessage = isBrowser ? 'Hello from the Web!' : isReactNative ? 'Hello from React Native!' : 'Hello from Node.js!'; console.log(platformSpecificMessage);