index.js

import React, { Component } from 'react';

class App extends React {
  constructor(props) {
    super(props);
    this.state = {
      liveRequest: false,
    };
  }

  componentDidMount() {
    setTimeout(() => {
      this.setState({ liveRequest: true });
    }, 5000);
  }

  render() {
    const { liveRequest } = this.state;

    let loading = `Hello, this is still loading...`;

    if (liveRequest) {
      loading = `It's alive!`;
    }

    return (
      <div className="App">
        <h1>{loading}</h1>
      </div>
    );
  }
}

export default App;