README.md

# react-app-polyfill

This package includes polyfills for various browsers.
It includes minimum requirements and commonly used language features used by [Create React App](https://github.com/facebook/create-react-app) projects.<br>
Please refer to its documentation:

- [Getting Started](https://github.com/facebook/create-react-app/blob/master/README.md#getting-started) – How to create a new app.
- [User Guide](https://github.com/facebook/create-react-app/blob/master/packages/react-scripts/template/README.md) – 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)
1. `window.fetch` (a Promise-based way to make web requests in the browser)
1. `Object.assign` (a helper required for Object Spread, i.e. `{ ...a, ...b }`)
1. `Symbol` (a built-in object used by `for...of` syntax and friends)
1. `Array.from` (a built-in static method used by array spread, i.e. `[...arr]`)

### Entry Points

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

```js
// This must be the first line in src/index.js
import 'react-app-polyfill/ie9';

// ...
```

#### Internet Explorer 11

```js
// This must be the first line in src/index.js
import 'react-app-polyfill/ie11';

// ...
```