RouillerRomain

import firebase from 'firebase/app';
import 'firebase/firestore';
import 'firebase/auth';

// Replace this with your own config details
var config = {
    apiKey: "AIzaSyBZ0iclqLM6B2ccDAZQqXO0TIhScB5K4EQ",
    authDomain: "a-simple-cms.firebaseapp.com",
    databaseURL: "https://a-simple-cms.firebaseio.com",
    projectId: "a-simple-cms",

RouillerRomain

import React, { Component } from 'react'

class ClassComponent extends Component {
  render() {
    return (
      <div>
        <p> My First ClassComponent </p>
      </div>
    )
  }

RouillerRomain

import React from 'react'

const FunctionnalComponent = (Props) => {
    return (
        <div className="container">
            <p> Our first Functionnal Component ! </p>
        </div>
    )
}
export default FunctionnalComponent