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Wix Stores has two catalog versions that are NOT backwards compatible:

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.

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

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 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 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 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.

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

Dashboard modals are popup dialogs triggered from dashboard pages or plugins. They consist of three files and use the Dashboard SDK for lifecycle control via openModal() and closeModal().