unpolyfill

react-app-polyfill replacement with IE9+ support.

Why

react-app-polyfill doesn't support IE9. The fetch polyfill it used is whatwg-fetch which is IE10+ only.

Usage

Import as ES6 module

Install unpolyfill as a dependency.

npm install --save unpolyfill

Import unpolyfill at the entry of application.

import 'unpolyfill'

Import via script

Put this line before bundle.

<script src="https://unpkg.com/unpolyfill"></script>

Features

Official

Partially adapted from react-app-polyfill readme

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])
6. Map
7. Set
8. requestAnimationFrame

Bonus

1. URLSearchParams

Polyfill

• promise-polyfill for Promise
• unfetch for window.fetch
• object-assign for Object.assign
• core-js for Symbol Array.from Map Set URLSearchParams
• raf for requestAnimationFrame