By nod_ on
Change record status: 
Published (View all published change records)
Project: 
Drupal core
Introduced in branch: 
9.4.x
Introduced in version: 
9.4.0-alpha1
Issue links: 
https://www.drupal.org/node/3265652
https://www.drupal.org/node/3087685
Description: 

jQuery UI had been considered EOL, but is again is actively maintained. This includes plans to keep jQuery UI up to date with new jQuery version and provide security support:

Please remember jQuery UI is in a maintenance state: we’ll make sure the library is compatible with new jQuery releases and that security issues are fixed but no new significant feature work is planned. We’ll also try to fix important regressions from jQuery UI 1.12.1; older long-standing bugs may not get fixed. Note that this does not affect jQuery Core which is still actively maintained.

This changes the context of the decision taken back in #3087685: Remove deprecated jQuery UI components and fork remaining source code into core and allows us to unfork jQuery and instead rely on the published jquery-ui npm package to provide the jQuery UI source code.

The efforts to remove jQuery UI from Drupal Core are still relevant and the deprecated jQuery UI libraries will remain deprecated. This is a change to facilitate Drupal Core maintenance.