import React from 'react'; import ReactDOM from 'react-dom'; import App from './app'; import { BrowserRouter as Router } from 'react-router-dom'; import axios from 'axios' type RutimeConfig = { apiBaseUrl: string; } async function loadRuntimeConfig() { let result: RutimeConfig | undefined; await axios.get("public/runtime-config.json" ).then(response => { // All was ok, let's sent to success page ... result = response.data as RutimeConfig; console.log("Dynamic configuration->" + response.data); }).catch(e => { console.log(e) }); // Was is loaded ? if (!result) { throw "Please, review runtime config" } return result; } async function bootstrapApplication() { const config: RutimeConfig = await loadRuntimeConfig(); ReactDOM.render( , document.getElementById('root') as HTMLElement ) } bootstrapApplication()