First step toward making morfo articulate the three layers (soma, sema,
eidos) instead of just serving soma. Archetype is a small canonical
vocabulary that lets a part declare its conceptual role beyond its
component-specific kebab name.
Articulation purpose:
- Eidos can style transversally — `[data-archetype=trigger] { ... }`
applies to every Trigger across all 60+ components without enumeration.
- Sema can map archetypes to canonical action verbs (`trigger` may fire
`activate`, `item` may fire `select`).
- Docs can categorize parts cross-component for discovery.
The "2-of-3 rule" justifies the extension: at least two layers consume it.
Vocabulary
24 archetypes covering the common cross-component roles:
provider, trigger, content, overlay, viewport, item, option, indicator,
thumb, track, label, title, description, close, action, header, image,
fallback, arrow, separator, group, input, segment, preview.
Designed to stay small. New archetype only added when at least two
existing components share the role. Genuinely-unique parts (Slider.Range,
PinInput.Segment) omit the field.
Implementation
- `MorfoPart.archetype?: MorfoArchetype` — optional union type.
- `ARCHETYPE_VOCABULARY` exported as `as const satisfies` array for
enumeration tooling.
- `partShallowSchema` (sium validator) gets `archetype: optional(union(...))`.
- MorfoRuntime caches `partMeta` in PartRegistration so `partProps` can
read `archetype` without re-walking the morfo tree per render.
- `runtime.partProps(part)` emits `data-archetype="..."` when declared.
Static identity (never mutates), so it ships through partProps not
through `dom.apply` — Svelte renders it once on first paint.
Tests
2 new tests:
- partProps emits data-archetype when morfo declares one (inline test
morfo to avoid coupling to catalog state).
- partProps omits data-archetype when not declared (Toggle, pre-catalog).
Verification
- 22/22 runtime tests green.
- svelte-check unchanged at 155.
- No morfo currently declares archetype yet — catalog pass follows in the
next commit. All existing morfos remain valid (field is optional).
dev
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