core/jquery.form library deprecated

core/jquery.form library is deprecated in Drupal 9.4 and removed from Drupal 10.

The assets of core/jquery.form are still present in Drupal 10, but only via the core/internal.jquery.form. As the name suggests, this library is internal and is only intended for use with Drupal core (i.e. contrib/custom modules should not use this library as it could potentially change/disappear in any release.).

Contrib/custom code that continues to depend on jQuery form may benefit from not assuming jQuery.form will be provided with core, either by removing the jQuery.form dependency or including jQuery.form with the project codebase and including it via a project-specific library. To avoid having multiple jquery.form instances loaded on a page the project-specific library could use hook_library_alter() to load core's core/assets/vendor/jquery-form/jquery.form.min.js when present, otherwise use the version included with the project.