Gets the extension ID of the page the editor bound your extension to, or undefined if the page isn't one of your app's page extensions.
Note: This method is available for site page extensions. It's not available from a site widget or plugin's settings panel. It rejects there with an internal host error. See the Page API introduction for details.
This method doesn't take any parameters.
Promise<string | undefined>
The page extension's ID, or undefined if the current page isn't a page extension owned by your app.
Last updated: 25 August 2026