MainActivity.kt

package com.auth0example

import android.os.Bundle
import com.facebook.react.ReactActivity
import com.facebook.react.ReactActivityDelegate
import com.facebook.react.defaults.DefaultNewArchitectureEntryPoint.fabricEnabled
import com.facebook.react.defaults.DefaultReactActivityDelegate

class MainActivity : ReactActivity() {

  /**
   * Returns the name of the main component registered from JavaScript. This is used to schedule
   * rendering of the component.
   */
  override fun getMainComponentName(): String = "Auth0Example"

  /**
   * react-native-screens requires that fragment state is never restored, otherwise the app
   * crashes with "Screen fragments should never be restored" when the OS recreates the
   * Activity (e.g. after the Auth0 redirect or process death). Passing null discards the
   * saved fragment hierarchy so React Native rebuilds it fresh.
   * See https://github.com/software-mansion/react-native-screens/issues/17
   */
  override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(null)
  }

  /**
   * Returns the instance of the [ReactActivityDelegate]. We use [DefaultReactActivityDelegate]
   * which allows you to enable New Architecture with a single boolean flags [fabricEnabled]
   */
  override fun createReactActivityDelegate(): ReactActivityDelegate =
      DefaultReactActivityDelegate(this, mainComponentName, fabricEnabled)
}