```javascript
import { Client, Databases, Permission, Role } from "appwrite";

const client = new Client()
    .setEndpoint('https://<REGION>.cloud.appwrite.io/v1') // Your API Endpoint
    .setProject('<YOUR_PROJECT_ID>'); // Your project ID

const databases = new Databases(client);

const result = await databases.updateDocument({
    databaseId: '<DATABASE_ID>',
    collectionId: '<COLLECTION_ID>',
    documentId: '<DOCUMENT_ID>',
    data: {
        "username": "walter.obrien",
        "email": "walter.obrien@example.com",
        "fullName": "Walter O'Brien",
        "age": 33,
        "isAdmin": false
    }, // optional
    permissions: [Permission.read(Role.any())], // optional
    transactionId: '<TRANSACTION_ID>' // optional
});

console.log(result);
```