---
status: stable
last_updated: 2026-05-18
---

# ADR-001: HTML-agnostic core

**Status**: Accepted

## Context

UJSX is a universal JSX IR that treats JSX as an intermediate representation. The core types (UNode, UElement, UniversalProps) are deliberately free of any platform-specific concepts.

## Alternatives Considered

- **HTML-compatible props (className, onClick, etc.)**: Include DOM/HTML-specific prop names in core types. Rejected because it biases toward DOM rendering and forces non-DOM hosts to filter/translate irrelevant props.
- **Separate "web" prop types**: Create a parallel type hierarchy for web/DOM props alongside the universal core. Rejected because it creates two type hierarchies and increases complexity for hosts that don't need HTML.

## Decision

UJSX core does NOT include HTML/DOM-specific concepts. No `onClick`, no `className`, no `style`, no `aria-*`. UniversalProps accepts any key-value pairs because different hosts need different prop shapes. The host decides what props mean.

## Consequences

### Positive
- Clean separation. Each host defines its own prop semantics. Flowgraph hosts use `{ name, type, url }` not `{ className, id }`.
- TypeBox schemas for host-specific props can validate independently. No "stripping" step needed.

### Negative
- Consumers targeting HTML must map their own props (e.g., `class` → `className`). This is the host's responsibility.
- No built-in event handling system — events are host-specific. The event system (`PubSubLike`, `EventEnvelope`) is generic.