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ujsx/docs/architecture/decisions/001-html-agnostic-core.md
glm-5.1 0d5b9d5ea8 stabilize architecture docs: address review findings and advance to stable
Critical fixes:
- Restructure pointers.md: move setNode prop-key writes section under
  its own heading (was incorrectly nested under selectNode)
- Add Context/Density/Direction/RenderContext documentation section
  to host-config.md (was only a brief constraint bullet)
- Advance all 5 ADRs from Status: Proposed → Accepted and frontmatter
  from status: draft → status: stable (decisions are driving implementation)
- Add error handling philosophy section to README

Warning/suggestion fixes:
- Add isUElement null check (node !== null) to schema.md discriminator table
- Add UjsxEnvelope convenience type documentation to events.md
- Add Direction Unicode arrow naming note to transforms.md
- Standardize all cross-references from absolute docs/research/ paths
  to relative ../research/ paths across all architecture docs
- Fix schema.md ADR references to use relative paths
- Reduce redundancy between transforms.md and host-config.md Direction notes
- Update all architecture doc frontmatter from draft → stable

Deferred:
- Performance model section (reconciler not yet built)
- Concepts/glossary document (low ROI at current scale)
- Line counts in source references (would date quickly)
2026-05-18 16:10:24 +00:00

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---
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.