App-render.js

render() {
  const RootNavigator = createRootNavigator(this.state.isAuthenticated);
  const AppContainer = createAppContainer(RootNavigator);

  return (
    <AuthContext.Provider
      value={{
        isAuthenticated: this.state.isAuthenticated,
        setAuthenticated: this.setAuthenticated
      }}
    >
      <AppContainer />
    </AuthContext.Provider>
  );
}