lumino-widgets
Domain: JupyterLab GUI
🎯 Motivation
The widget toolkit library (formerly PhosphorJS) that JupyterLab uses for its panel, tab, and layout system. Pure TypeScript.
📋 Concrete Example
Import Widget from @lumino/widgets, create new Widget({node: el}), and add it to the main dock panel.
🔗 Analogy
Lumino widgets are building bricks — each is a rectangular panel you stack, tab, or split in the layout.