Design system (opens in a new tab)
The @foo/ui component library, rendered live from design tokens — it re-themes light, dark, and brand from one switcher.
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Demos
Each demo opens straight into the live showcase, where the pattern runs against synthetic data with its source open beside it — paired with the write-up that explains the decision behind it. For the whole application, there's the showcase ↗.

Live on the demo site
The @foo/ui component library, rendered live from design tokens — it re-themes light, dark, and brand from one switcher.
A sortable, filterable, virtual-scrolling grid over synthetic financial rows.
Signal-based state management driving the accounts view.
The redux-style store, side by side with the signal approach for the same data.
Per-route title and meta tags, read straight back from the rendered DOM.
Core Web Vitals, instrumented on the initial load.
The component test harness and coverage surface.
Keyboard paths, focus management, and the WCAG AAA patterns baked into the defaults.