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After creating any extension file, you must update the main src/extensions.ts file to register the extension with the app.

Creates event extensions for Wix CLI applications. Events are triggered when specific conditions occur—on a Wix user's site for app projects, or on your project's site for headless projects. Your project responds using event extensions built on JavaScript SDK webhooks; the CLI subscribes your project to these webhooks.

Creates CMS data collections for Wix CLI apps. The data collections extension allows your app to automatically create CMS collections when it's installed on a site. Collections store structured data that can be accessed from dashboard pages, site pages, backend code, and external applications.

Creates custom element widget extensions for Wix CLI applications. Site widgets are React components converted to web components that appear in the Wix Editor, allowing site owners to add interactive, configurable widgets to their pages with a built-in settings panel.

Creates embedded script extensions for Wix CLI applications. Embedded scripts are HTML code fragments that get injected into the DOM of Wix sites, enabling integration with third-party services, analytics tracking, advertising, and custom JavaScript functionality.

Creates site plugin extensions for Wix CLI applications. Site plugins are custom elements that integrate into predefined slots within Wix business solutions (like Wix Stores, Wix Bookings, Wix eCommerce), extending their functionality and user experience.

Creates HTTP endpoints for Wix CLI applications — server-side routes that handle HTTP requests, process data, and return responses. HTTP endpoints are powered by Astro endpoints and are automatically discovered from the file system.

Creates service plugin extensions for Wix CLI applications. Service plugins are a set of APIs defined by Wix that you can use to inject custom logic into the existing backend flows of Wix business solutions or to introduce entirely new flows to Wix sites.

Creates full-featured dashboard page extensions for Wix CLI applications. Dashboard pages appear in the Wix site owner's dashboard and enable site administrators to manage data, configure settings, and perform administrative tasks.

Validates Wix CLI applications through a four-step sequential workflow: package installation, TypeScript compilation check, build, and preview.