[12.x] [meta] Requirements for tagging 12.0.0-beta1

Must-haves prior to tagging 12.0.0-beta1

Release notes: #3564240: 12.0.0-beta1 release notes

All issues tagged "12.0.0 beta blocker".

1. ✅ Fully support PHP versions above the Drupal 11 minimum.
2. Update core façade and core packages for new requirements.
   • #3067979: Exclude test files from release packages
3. Update or decouple/remove PHP (Composer) dependencies.
   • ✅ Symfony:
     • ✅ Must have: Update to Symfony 8: #3570077: Update to Symfony 8
     • Must have: Update to Symfony 8.1: #3588847: Update to Symfony 8.1
   • ✅ PHPUnit:
     • ✅ Must have: PHPUnit 12: #3527936: Introduce support for PHPUnit 12
     • Could have: PHPUnit 13 #3574681: [Nov 2026] Introduce support for PHPUnit 13.5 -- instead of making Drupal 12.0 compatible, we will wait for last minor of PHPUnit 13 (after Drupal 12 release) so all deprecations are included
   • Doctrine
     • #3396165: [meta] Convert all core plugin types to attribute discovery
   • Guzzle
     • #3612544: Update to Guzzle 8
   • Re-evaluate other backend dependencies in the year prior to the release.
4. Update or decouple/remove frontend dependencies.
   • Node
   • CKEditor5 #3527914: Use UMD installation method for CKEditor5
   • HTMX #3555916: Update to htmx 4
   • jQuery
   • jQuery UI
   • Yarn
   • ESLint #3440225: Update to ESLint v9 with standard rules
   • Nightwatch
5. Remove all deprecated code, libraries, and BC layers.
   • Extensions: #3488826: [meta] Remove deprecated extensions from Drupal 12
   • #3301206: [meta] Fix incomplete/incorrect deprecations in Drupal core
   • Remove deprecated code outside deprecated modules: #3553503: [meta] Remove deprecated classes, methods, procedural functions and code paths outside of deprecated modules from Drupal 12
   • Address usage of upstream deprecations (PHP, dependencies, etc.): [#]
6. Resolve critical 11.x -> 11.x upgrade path bugs.
7. Prevent downgrades between equivalent minor versions:
   • #3561302: Register equivalent updates on site install
8. Remove old upgrade paths up to 12.x.0 and add new database dumps.
9. Resolve any significant outstanding bugs for new platform requirements (PHP, Composer, etc.)
10. Resolve any 12.0.x-only security or data integrity issues.
11. Resolve other 12.0.x-only upgrade blockers.
12. Update all dependencies (backend and frontend) to their latest versions immediately before tagging 11.0.0-beta1.
    • Composer dependencies
    • Yarn dependencies
13. Update COPYRIGHT.txt
14. 12.0.0-beta1 release notes. #3564240: 12.0.0-beta1 release notes

Should-haves prior to tagging 12.0.0-beta1

These become beta targets if they are not completed by the deadline, and may contribute to other adjustments to the schedule (TBD).

1. Dynamically prevent equivalent updates based on known equivalent minors? See #20.
2. Fix DB fixtures process:
   • #3213633: Improve DX of maintaining migration database fixtures: provide an option for creating per-table database fixtures in DbDumpcommand
   • #3082230: [meta] Convert some tests to Build tests
3. jQuery UI
   • #2158943: PP-1 Add a native dialog element using HTMX to deprecate the jQuery UI dialog
   • #3076171: Provide a new library to replace jQuery UI autocomplete
4. Ensure that 12.x.x-beta1 ships with logic for warnings about future security coverage EOLs (both for the LTS version of Drupal itself, and for PHP versions, with dates hard coded as needed).
   • #3378393: Hardcode security coverage EOL dates for Drupal 10.last-1 and 10.last
   • #3361728: Make 10.x EOL warning better than the 9.5.x one
5. Backbone: #3145958: [META] Re-evaluate use of Backbone.js in core (marked internal in Drupal 10)
6. Drupal CMS :
   • #3067979: Exclude test files from release packages
7. Disruptive issues:
   • #3425412: [Sep 14, 2026] Bump PHPStan rule level to 3
   • #3278431: [May 2026] Use PHP 8 constructor property promotion for existing code
8. Other issues
   • #2346093: Remove views module weight
   • Ensure that user facing URLs are not 404, see the script in #3553512: [meta] Ensure documentation URLs are valid
   • Ensure that cspell:ignore lines are correct, see the script in #3560682: Remove words not needed in cspell:ignore
   • #3551053: Remove jsdoc integration for CKEditor5
   • #2876298: Remove scaffolded csslint and eslint config
   • #3562477: Drop support for justinrainbow/json-schema:^5
   • #3618806: Update UPDATE.txt for Drupal 12