JavaScript Environment Requirements
React 16 depends on the collection types Map and Set. If you support older browsers and devices which may not yet provide these natively (e.g. IE < 11) or which have non-compliant implementations (e.g. IE 11), consider including a global polyfill in your bundled application, such as core-js.
A polyfilled environment for React 16 using core-js to support older browsers might look like:
import 'core-js/es/map';
import 'core-js/es/set';
import React from 'react';
import ReactDOM from 'react-dom';
ReactDOM.render(
<h1>Hello, world!</h1>,
document.getElementById('root')
);
React also depends on requestAnimationFrame
(even in test environments).
You can use the raf package to shim requestAnimationFrame
:
import 'raf/polyfill';
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