widget-registry
Domain: JupyterLab GUI
🎯 Motivation
A JupyterLab token-based registry where extensions register widgets, renderers, and factories. Uses @lumino/coreutils.Token for type-safe lookup.
📋 Concrete Example
Define const IMyWidget = new Token<IMyWidget>('mywidget') and register with app.registerPlugin({token, provides}).
🔗 Analogy
The widget registry is a sign-up board — extensions register their widgets under a token so others can find them.