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CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

Branch note (active-uix): the legacy layers src/lib/, src/uix/terra/, src/uix/air/ and the old src/routes/ test tree were removed during the UIX refactor. The new ecosystem lives in src/arts/, src/libs/, src/svrs/, and src/uix/{active-uix,soma,sema,eidos,morfo}. Demos are being re-authored under web/routes/ from scratch.

Build / Test Commands

npm run dev          # Start dev server (routes resolve from web/routes)
npm run build        # Production build (static via adapter-static)
npm run test         # Run all tests once
npm run test:unit    # Run tests in watch mode
npx vitest run src/uix/morfo/compile.test.ts   # Run a single test file
npx vitest run -t "describe name"              # Run tests matching a pattern
npm run check        # Type check with svelte-check
npm run lint         # Check formatting (Prettier)
npm run format       # Auto-format

Code Style

Tabs for indentation, single quotes, no trailing commas, 100 char print width (Prettier).
Comments in English. (Some legacy Spanish comments remain — don't add new ones.)
Svelte 5 runes mode is enforced globally (svelte.config.js dynamicCompileOptions).
DOM event handlers: lowercase (onclick, onfocus). User callbacks: camelCase (onComplete, onInteractOutside).
State: $state() without #. Derived: readonly x = $derived.by(...).

Path Aliases

Aliases are kept in sync between svelte.config.js and vite.config.ts. Source of truth is vite.config.ts (single aliases const reused by both top-level resolve and the server-test project).

Alias	Target
`@`	`src/`
`$active-app`, `$adom`, `$auth`, `$bus`, `$cache`, `$connection`, `$format`, `$frontend`, `$http`, `$lang`, `$logger`, `$orca`, `$perm`, `$prefs`, `$session`, `$sium`, `$storage`, `$timer`	`src/arts/{name}`
`$libs`, `$locale`, `$reactive`	`src/libs`, `src/libs/locale`, `src/libs/reactive`
`$svrs`	`src/svrs/`
`$uix`, `$active-uix`, `$soma`	`src/uix`, `src/uix/active-uix`, `src/uix/soma`

Vitest Two-Project Structure

vite.config.ts defines two test projects:

client: Browser tests via Playwright for *.svelte.{test,spec}.{js,ts}.
server: Node environment for *.{test,spec}.{js,ts} (excludes svelte tests).

Architecture

The UIX is layered around a declarative contract (morfo) that the other layers consume. Each consumer reads the morfo via compileMorfo(morfo), never by walking the raw declaration.

arts/   → runtime artifacts: active-app, adom, perm, prefs, ...
libs/   → pure helpers (zero-dep): reactive, days, dom, locale, ...
svrs/   → server-authoritative engines

uix/morfo      → declarative contract: parts, data-attrs, ARIA, keyboard,
                 events with semantic family/intent. Compiler at compile.ts
                 emits CompiledMorfo (cached by WeakMap).
uix/sema       → semantic engine + channels (visual / sound / vibra).
                 The visual channel writes data-event* during a hold window.
                 State attrs (data-state, data-disabled, ...) are NEVER
                 touched by sema — they belong to the morfo runtime.
uix/soma       → headless component layer. Each provider consumes morfo +
                 sema via `runtime.trigger(eventName)` which sequences:
                 prewrite → semantic.emit → handler → effect-driven state attrs.
uix/eidos      → CSS layer that selects against the data-attrs the morfo
                 contract promises. lint.ts validates a CSS file against
                 compileMorfo(morfo).contracts.cssSelectors.
uix/active-uix → composition root. Two boot modes:
                 - createActiveUix(options)        — standalone (owns services)
                 - attachActiveUix(activeApp)      — attach to external app

morfo (`src/uix/morfo/`)

Single source of truth for a component. A Morfo declares:

parts[] — kebab + archetype + data + aria + optional keyboard
events[] — name + target partRef + semantic + optional prewrite + commits
focus — initial / trap / return / restore (for overlay components)

compileMorfo(morfo) returns a CompiledMorfo with pre-resolved AttrPlan[], KeyboardPlan[], ActionPlan[], and contracts.cssSelectors (the closed set of selectors eidos is allowed to use). Cached by morfo identity.

eidos linter

scripts/eidos-lint.ts <component> and scripts/eidos-lint-all.ts classify every [data-*] selector in eidos CSS as morfo-backed / eidos-only / invalid. Use this to detect drift between the morfo contract and the eidos rules.

Key Conventions

Never modify the morfo declaration files without updating the eidos selectors and provider sources that depend on them.
Read before acting. When told to read a file, read it. Don't paraphrase.
Verify before reporting done. Run npm run check and the relevant vitest scope. UI claims need a browser check; if you can't run a browser, say so.
No backward-compat shims when relocating code. Update consumers and delete the old path; don't leave a re-export.
No re-export façades between layers (e.g. soma must not re-export dias — consume $libs/days directly).
Provider naming: child providers reference the parent as provider, never root. The exported component is <Xxx.Provider>. createAttrs still uses the part kebab 'provider' internally.
Data-attr naming: data-{component} (provider) and data-{component}-{kebab} (sub-parts). Never data-soma-*. The compiler emits these via compiled.parts.attrs; runtime queries match exactly.

Critical Rules

NEVER delete files without explicit instruction ("delete", "remove", "borra", "elimina"). If ambiguous, ASK first.
NEVER create fake translators / mocked services in tests for components. Use real instances composed via createActiveUix or attachActiveUix.
NEVER skip hooks (--no-verify) or bypass signing unless explicitly asked. If a hook fails, fix the root cause.
$reactive survives, $lib does not. The $reactive alias points to the current src/libs/reactive; the singular $lib alias was removed in the cleanup phase and any code that resurfaces it is a regression.

Reference Documents

Architecture overview and motivations: src/uix/active_architecture.md.

Per-layer references:

The canonical guide for sema vocabulary, morfo event shape, color tokens, persistence and a11ySemantic lives in src/docs/GUIA_IMPLEMENTACION_SEMAUIX.md. That document is authoritative — when in doubt about families, intents, verbs, color subsets per component, or holds, that's the source.

Session hand-off — 2026-05-08 (post-canon alignment)

The codebase has been aligned to the canonical guide in three swept phases:

Sema verbs (src/uix/sema/verbs.ts): restructured to family-keyed Record. select/toggle/acknowledge moved to commit; edit removed from handle (now expressed as shift.enter-mode). New verbs added per the canon (tap, focus, release, complete, restore, remind, route, step, syncing, etc.). validateEventName recognises both {verb}-{variant} and {family}-{verb} shapes.
Morfo event shape (src/uix/morfo/types.ts): target moved inside semantic; added optional verb (advisory, validated against SEMA_VERBS[family]) and sequence: 'pre' | 'coincident' | 'post'. All 22 events across toggle/toast/popover/drawer/dialog refactored to the new shape.
Color tokens (src/uix/eidos/themes/base/{light,dark}.css): doctrinal 8 tokens — primary, secondary, neutral, affirm, fulfill, risk, threat, loss. Renamed success → fulfill, warning → risk, danger → threat (same hex). New primitives for secondary (slate-blue), affirm (teal-mint, low activation), loss (deep violet-grave, posterior). info palette deleted entirely. Legacy aliases in _static.css deleted (clean cut, no transition). 29 consumers (recipe CSS + tokens) migrated to doctrinal names.

Earlier in the session:

Toggle is the eidos pilot (src/uix/eidos/components/toggle/): recipe + Svelte wrapper + types + index + README. The pattern is documented in src/uix/eidos/components/README.md.
Eidos has a shared lib at src/uix/eidos/lib/types.ts. First type is Size ('xxs' | 'xs' | 'sm' | 'md' | 'lg' | 'xl' | 'xxl' | 'full'). Components narrow with Extract<Size, 'sm' | 'md' | 'lg'> per the per-component-subset doctrine.
No Eidos prefix on types. The path $uix/eidos/components/{x} already conveys layer. Public types are ToggleProps, ToggleVariant, ToggleSize.
API doctrine: soma stays compound (Toggle.Provider); eidos exports both default and Provider for single-part components so <Toggle> works for the ergonomic case while <Toggle.Provider> stays available.
SoundChannel eager-init landed in src/uix/sema/chans/sound.ts to fix the autoplay race: the AudioContext is created + resumed synchronously on the first user gesture (capture-phase listener on document).
Demo page (web/routes/toggle/+page.svelte) has the live preview rendered ALWAYS above the tablist (so Sema-tab Play buttons can fire on the real toggle) and the motion preview amplifies scale ×8 visually only — doctrinal values stay in the <dl>.

Next concrete steps:

Migrate switch to the eidos wrapper pattern. Toggle is the template. Switch already has the soma-side updated; needs eidos/components/switch/ subdirectory with switch.css recipe (move from flat components/switch.css), switch.svelte wrapper, types.ts, index.ts, README.md. Then a demo page at web/routes/switch/+page.svelte mirroring toggle's tab structure. After switch: collapsible → dialog → drawer → popover → toast → avatar.
Persistence + holds-by-intent (guide §6) — defer until the first concrete signal.warn / signal.alert consumer appears. Today every signal is transient with a numeric hold. Need to add persistence: 'transient' | 'untilAction' | 'untilFix' | 'stateBound' to SemanticSignal + the holds-by-intent table per the canon.
a11ySemantic per event (guide §9) — defer until there's a reduced-motion runtime helper + live-region helper to consume the contract.
Polymorphic events (guide §5.3, allowedFamilies + defaultSemantic) — defer; no current component needs polymorphism.
The docs site's topbar prefs (sound mute toggle, theme switcher) are wired up but the sound mute does NOT yet drive SoundChannel.masterGain. Wiring belongs on layout.svelte's $effect.

Baseline npm run check shows 39 pre-existing errors in test files unrelated to this work. Tests are 217/217 green across uix.

Behavioral Guidelines

These reduce common LLM coding mistakes. They bias toward caution over speed — for trivial tasks, use judgment.

1. Think before coding

Don't assume. Don't hide confusion. Surface tradeoffs.

State assumptions explicitly. If uncertain, ask.
If multiple interpretations exist, present them — don't pick silently.
If a simpler approach exists, say so. Push back when warranted.
If something is unclear, stop. Name what's confusing. Ask.

2. Simplicity first

Minimum code that solves the problem. Nothing speculative.

No features beyond what was asked.
No abstractions for single-use code.
No "flexibility" or "configurability" that wasn't requested.
No error handling for impossible scenarios.
If you write 200 lines and it could be 50, rewrite it.

3. Surgical changes

Touch only what you must. Clean up only your own mess.

Don't "improve" adjacent code, comments, or formatting.
Don't refactor things that aren't broken.
Match existing style, even if you'd do it differently.
If you notice unrelated dead code, mention it — don't delete it.

When your changes create orphans, remove the imports / variables / functions your changes made unused. Don't remove pre-existing dead code unless asked.

4. Goal-driven execution

Define success criteria. Loop until verified.

"Add validation" → "Write tests for invalid inputs, then make them pass."
"Fix the bug" → "Write a test that reproduces it, then make it pass."
"Refactor X" → "Ensure tests pass before and after."

Strong success criteria let you loop independently. Weak criteria require constant clarification.

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