[12.x] [meta] Deprecate dependencies, libraries, modules, and themes that will be removed from Drupal 12 core

Tarballs

• 🌱 [meta] Deprecate tarballs, because they are incompatible with Composer-managed dependencies, Automatic Updates, Project Browser, and release managers' health Active

Deprecation infrastructure

• 📌 Create a way to declare a plugin as deprecated Needs work

JavaScript Dependencies

• 📌 Provide a new library to replace jQuery UI autocomplete Needs work
• 📌 Add a native dialog element to deprecate the jQuery UI dialog Needs work
• 📌 Replace Contextual Links BackboneJS usage with VanillaJS equivalent Needs work

PHP dependencies

• Remove doctrine once 📌 [meta] Convert all core plugin types to attribute discovery Active is complete
• Archive_Tar: Research whether the Archive_Tar dependency can be removed once Autoupdates is stable (needs issue)

Libraries

Modules

• Field Layout 📌 [META] Enable layout builder for form displays, and deprecate field_layout Postponed

Experimental Modules

NA

Remaining tasks

• Add additional issues as appropriate.
• Evaluate in early 2023, again after 10.2.0-beta1, and again prior to 10.3.0-alpha1.