# Checkout
Components and utilities making it possible to integrate with the WooCommerce Cart and Checkout Blocks.
## Table of Contents
- [Installation](#installation)
- [Usage](#usage)
- [Aliased imports](#aliased-imports)
- [Folder Structure Overview](#folder-structure-overview)
## Installation
This package is available as an external when the [WooCommerce Blocks Feature Plugin](https://wordpress.org/plugins/woo-gutenberg-products-block/) is installed and activated.
## Usage
Package components can be accessed via the `wc` global:
```js
const { ... } = wc.blocksCheckout;
```
### Aliased imports
Alternatively, you can map this to external to a custom alias using the [WordPress Dependency Extraction Webpack Plugin](https://github.com/WordPress/gutenberg/tree/trunk/packages/dependency-extraction-webpack-plugin):
```js
// webpack.config.js
const DependencyExtractionWebpackPlugin = require( '@wordpress/dependency-extraction-webpack-plugin' );
const dependencyMap = {
'@woocommerce/blocks-checkout': [ 'wc', 'blocksCheckout' ],
};
module.exports = {
// …snip
plugins: [
new DependencyExtractionWebpackPlugin( {
injectPolyfill: true,
requestToExternal( request ) {
if ( dependencyMap[ request ] ) {
return dependencyMap[ request ];
}
},
} ),
],
};
```
## Folder Structure Overview
This package contains the following directories. Navigate to a directory for more in depth documentation about each module.
| Directory | Contents |
| :--------------------------------------------------- | :--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| [`blocks-registry/`](./blocks-registry) | Used to **register new Inner Blocks** that can be inserted either automatically or optionally within the Checkout Block. _**Example use case:** Creating a newsletter subscription block on the Checkout._ |
| [`components/`](./components) | Components available for use by Checkout Blocks. |
| [`filter-registry/`](./filter-registry) | Used to **manipulate content** where filters are available. _**Example use case:** Changing how prices are displayed._ ([Documentation](./filter-registry)) |
| [`slot/`](./slot) | Slot and Fill are a pair of components which enable developers to render in a React element tree. In this context, they are used to **insert content within Blocks** where slot fills are available. _**Example use case:** Adding a custom component after the shipping options._ ([Documentation](./slot/README.md)) |
| [`utils/`](./utils) | Miscellaneous utility functions for dealing with checkout functionality. |
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