The package was moved to the main repository.
This package implements a simple UI framework and CKEditor 5's standard UI library.
See the @ckeditor/ckeditor5-ui package page in CKEditor 5 documentation.
Licensed under the terms of GNU General Public License Version 2 or later. For full details about the license, please check the LICENSE.md file or https://ckeditor.com/legal/ckeditor-oss-license.