React is not compatible right away with IE,
From the official documentation :
React supports all popular browsers, including Internet Explorer 9 and above, although some polyfills are required for older browsers such as IE 9 and IE 10.
We don’t support older browsers that don’t support ES5 methods, but
you may find that your apps do work in older browsers if polyfills
such as es5-shim and es5-sham are included in the page. You’re on your
own if you choose to take this path.
To make your application work on IE (11 or 9) you will have to install React-app-polyfill :
https://www.npmjs.com/package/react-app-polyfill
Features :
Each polyfill ensures the following language features are present:
Promise (for async / await support)
window.fetch (a Promise-based way to make web requests in the browser)
Object.assign (a helper required for Object Spread, i.e. { ...a, ...b })
Symbol (a built-in object used by for...of syntax and friends)
Array.from (a built-in static method used by array spread, i.e. [...arr])
Usage
First, install the package using Yarn or npm:
npm install react-app-polyfill
Now, you can import the entry point for the minimal version you intend to support. For example, if you import the IE9 entry point, this will include IE10 and IE11 support.
Internet Explorer 9
// This must be the first line in src/index.js
import 'react-app-polyfill/ie9';
// ...
Internet Explorer 11
// This must be the first line in src/index.js
import 'react-app-polyfill/ie11';
// ...
You can also configure your manifest to handle different browsers, using the following doc : https://github.com/browserslist/browserslist
example :
"browserslist": [
">0.2%",
"not dead",
"ie >= 9"
]
More information from the official site