Add `jsdom` as npm Dependency for ILIAS 12

[thibsy]

Assessment:

• This package is a JavaScript implementation of various web standards, for use with the Node.js environment.

General Information:

• Name of the dependency: jsdom
• Version: 27.2.0
• [X] this dependency was already used in ILIAS.
• [X] the dependency's license is compatible with ILIAS' license: MIT

Type of dependency:

• [ ] composer
• [X] npm

Usage:

• various JS unit tests in components/ILIAS/UI

Reasoning:

• This package implements the web-standard of browsers and provides objects like window and document, which are unknown to the Node.js environment. These objects can be injected into our components to perform/test desired actions.

Maintenance:

• Last update of the Library: 2025-11-12

Links:

• npm: https://www.npmjs.com/package/jsdom
• GitHub: https://github.com/jsdom/jsdom.git
• Documentation: https://github.com/jsdom/jsdom#readme

Alternatives:

• linkedom: however, its not as widely used (~15K) and does not do the exact same thing.

[matthiaskunkel]

Jour Fixe, 08 DEC 2025: Dependency is accepted for ILIAS 12.