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# babel-plugin-polyfill-corejs3
## Install
Using npm:
```sh
npm install --save-dev babel-plugin-polyfill-corejs3
```
or using yarn:
```sh
yarn add babel-plugin-polyfill-corejs3 --dev
```
## Usage
Add this plugin to your Babel configuration:
```json
{
"plugins": [["polyfill-corejs3", { "method": "usage-global", "version": "3.20" }]]
}
```
This package supports the `usage-pure`, `usage-global`, and `entry-global` methods.
When `entry-global` is used, it replaces imports to `core-js`.
## Options
See [here](../../docs/usage.md#options) for a list of options supported by every polyfill provider.
### `version`
`string`, defaults to `"3.0"`.
This option only has an effect when used alongside `"method": "usage-global"` or `"method": "usage-pure"`. It is recommended to specify the minor version you are using as `[email protected]` may not include polyfills for the latest features. If you are bundling an app, you can provide the version directly from your node modules:
```js
{
plugins: [
["polyfill-corejs3", {
"method": "usage-pure",
// use `core-js/package.json` if you are using `usage-global`
"version": require("core-js-pure/package.json").version
}]
]
}
```
If you are a library author, specify a reasonably modern `core-js` version in your
`package.json` and provide the plugin the minimal supported version.
```json
{
"dependencies": {
"core-js": "^3.20.0"
}
}
```
```js
{
plugins: [
["polyfill-corejs3", {
"method": "usage-global",
// improvise if you have more complicated version spec, e.g. > 3.1.4
"version": require("./package.json").dependencies["core-js"]
}]
]
}
```
### `proposals`
`boolean`, defaults to `false`.
This option only has an effect when used alongside `"method": "usage-global"` or `"method": "usage-pure"`. When `proposals` are `true`, any ES proposal supported by core-js will be polyfilled as well. |