TYPO3 Core

See https://docs.typo3.org/c/typo3/cms-core/main/en-us//Changelog/12.0/Breaking-96874-CKEditor-relatedPluginsAndConfiguration.html

Using the YAML configuration, it is possible to inject custom plugins as ES6 modules, e.g. like this:

editor:
   importModules:
      - '@my-vendor/my-package/timestamp-plugin.js'

The configuration for using importMaps to load custom modules is documented at https://docs.typo3.org/c/typo3/cms-core/main/en-us//Changelog/12.0/Feature-96510-InfrastructureForJavaScriptModulesAndImportmaps.html and configured in EXT:my_extension/Configuration/JavaScriptModules.php

That's clear to me, it's not about integrating a plugin, but about configuration via YAML or TS configuration. See my exemple files

Thx, Gotcha!

https://github.com/TYPO3/typo3/blob/f7751e8bc0aababd4041f79b6fa7547c3e57e90e/Build/Sources/TypeScript/rte_ckeditor/ckeditor5.ts#L104-L130 only forwards specific configuration keys.

To solve this, either a the new editor.config.settings.myExtensionButtons (new settings section) could be introduced, or all remaining keys of editor.config might be forwarded (later would allow to used all other editor config properties as well, see https://ckeditor.com/docs/ckeditor5/latest/api/module_core_editor_editorconfig-EditorConfig.html#member-users).

The generic option needs further clarification, thus it's on hold for the time being.

Patch set 1 for branch main of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at https://review.typo3.org/c/Packages/TYPO3.CMS/+/81381

Applied in changeset bd5a93e1c7576b40de34025b8195c2ca844eaf88.

Patch set 1 for branch main of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at https://review.typo3.org/c/Packages/TYPO3.CMS/+/81406

Applied in changeset 34384bb8614d8c914063ca20adb32315d9b48902.