react-app-polyfill

This package includes polyfills for various browsers. It includes minimum requirements and commonly used language features used by Create React App projects.
Please refer to its documentation:

• Getting Started – How to create a new app.
• User Guide – How to develop apps bootstrapped with Create React App.

Features

Each polyfill ensures the following language features are present:

1. Promise (for async / await support)
2. window.fetch (a Promise-based way to make web requests in the browser)
3. Object.assign (a helper required for Object Spread, i.e. { ...a, ...b })
4. Symbol (a built-in object used by for...of syntax and friends)
5. Array.from (a built-in static method used by array spread, i.e. [...arr])

Entry Points

There is no single entry point. You can only import individual browser support levels.

Internet Explorer 9

// # index.js
import 'react-app-polyfill/ie9'; // make this the first line of your application

// ...

Internet Explorer 11

// # index.js
import 'react-app-polyfill/ie11'; // make this the first line of your application

// ...