expo/build/launch/registerRootComponent.js

The Expo SDK

import '../Expo.fx';
import { AppRegistry, Platform } from 'react-native';
export default function registerRootComponent(component) {
    let qualifiedComponent = component;
    if (process.env.NODE_ENV !== 'production') {
        const { withDevTools } = require('./withDevTools');
        qualifiedComponent = withDevTools(component);
    }
    AppRegistry.registerComponent('main', () => qualifiedComponent);
    // Skip querying the DOM if we're in a Node.js environment.
    if (Platform.OS === 'web' && typeof window !== 'undefined') {
        const rootTag = document.getElementById('root');
        if (process.env.NODE_ENV !== 'production') {
            if (!rootTag) {
                throw new Error('Required HTML element with id "root" was not found in the document HTML.');
            }
        }
        AppRegistry.runApplication('main', {
            rootTag,
            hydrate: process.env.EXPO_PUBLIC_USE_STATIC === '1',
        });
    }
}
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