Fine-Grained Reactivity.
Zero Virtual DOM.

Signals bind directly to DOM nodes via WeakRef. Every update is O(1). No diffing, no reconciliation, no waste.

$ npm create cellui@latest

import { signal, computed, view, mount } from '@cmj/cellui';

const App = () => {
  const count = signal(0);
  const doubled = computed(() => count.value * 2);

  return view`
    <div>
      <h1>${count} × 2 = ${doubled}</h1>
      <button onclick="${() => count.value++}">+</button>
    </div>
  `;
};

mount('#app', () => App());

Why CellUI?

⚡

Direct Signal-to-DOM

No virtual DOM, no diffing. Signals update the exact text node or attribute that changed. Nothing else runs.

🧠

WeakRef Memory Safety

Subscriptions are tied to DOM nodes via WeakRef. When a node is garbage collected, the signal automatically unsubscribes.

🧬

Tagged Templates

No JSX, no build step required. Write HTML with signal interpolation using tagged template literals.

🧭

Built-in Router

URL-synced routing with pattern matching, params extraction, and browser history support.

🎭

Portals & Transitions

Render outside the parent tree for modals. CSS enter/leave transitions with automatic cleanup.

🧪

Testing Utilities

Built-in render() with getByText, getBySelector, and unmount. No external testing library needed.

Performance

CellUI vs equivalent vanilla JS implementations

Signal Updates (10K subscribers) 0.5x — 2x faster

Effect Tracking (100 signals) 0.7x — 1.4x faster

Fine-Grained vs VDOM Diffing 0.02x — 49x faster

Text Node Updates (10K) 1.3x overhead

List Reconciliation (1K shuffle) 2.4x overhead

Fine-Grained Reactivity.Zero Virtual DOM.