Components that needs to be blocked

[React] Router Guard

import { Redirect } from 'react-router-dom'

// in function or class's render() :
const uid = this.props.uid
if (!uid) {
  return <Redirect to='/' />
}

// below component class or function
const mapStateToProps = (state) => {
  return {
    uid: state.firebase.auth.uid
  }
}