### Installing y-indexeddb package via npm

Source: https://github.com/yjs/y-indexeddb/blob/master/README.md

This shell command installs the `y-indexeddb` package and saves it as a dependency in your project's `package.json` file, making the IndexedDB persistence provider available for use with Yjs.

```Shell
npm i --save y-indexeddb
```

--------------------------------

### Initializing IndexeddbPersistence and handling sync event in JavaScript

Source: https://github.com/yjs/y-indexeddb/blob/master/README.md

This JavaScript snippet demonstrates how to instantiate `IndexeddbPersistence` with a unique document name and a Yjs document. It also sets up an event listener for the 'synced' event, which logs a message once the database content is loaded or if no content is found.

```JavaScript
const provider = new IndexeddbPersistence(docName, ydoc)

provider.on('synced', () => {
  console.log('content from the database is loaded')
})
```

=== COMPLETE CONTENT === This response contains all available snippets from this library. No additional content exists. Do not make further requests.