Constela, a compiler-first UI language, has evolved to feature parity with React/Next.js for most common use cases. This evolution brings timer actions, extended event data, form features, and portal & observer capabilities. These additions make Constela a formidable competitor in the UI development space, particularly for those looking to harness AI-generated UIs.

The new features include delay, interval, and clearTimer actions, allowing for delayed execution, periodic data polling, and dynamic timers. Enhanced event data support covers keyboard, mouse, touch, scroll, and file inputs, providing richer interactivity. Form features now include focus control and validation state, leveraging the HTML5 Constraint Validation API.

Additionally, Constela introduces portal nodes for rendering outside the component tree, perfect for modals and tooltips. The IntersectionObserver API is also supported, enabling efficient infinite scroll and lazy loading. Developers can further control event handler execution with debounce and throttle options, optimizing performance for user interactions.

These updates position Constela as a strong alternative for developers seeking a deterministic, AI-friendly UI language with compile-time validation and smaller bundles. With these enhancements, Constela is well-equipped to handle a wide range of UI patterns, from auto-hiding notifications to infinite scroll.