@adia-ai/web-components

Vanilla web components + A2UI runtime for AdiaUI. 95 light-DOM custom elements + 56 composable traits, a reactive core (signals + tagged-template renderer), form-associated form controls, and integration into the A2UI generation pipeline.

This package ships UI atoms only. Composite shells (admin / chat / editor / simple / theme) live in @adia-ai/web-modules. The generation pipeline lives in @adia-ai/a2ui-compose; the pattern corpus in @adia-ai/a2ui-corpus; the MCP server in @adia-ai/a2ui-mcp.

Consumer guide: USAGE.md — property reactivity, event contract, form participation, lifecycle, registration, TypeScript. Start here if you're integrating AdiaUI into an app.

Live demos for every primitive at https://ui-kit.exe.xyz/site/components/<name> — <name> is the tag without the -ui suffix (e.g. button, select, slider).

Install

npm install @adia-ai/web-components

For composite shells (admin / chat / editor / simple / theme clusters), pair with @adia-ai/web-modules:

npm install @adia-ai/web-components @adia-ai/web-modules

Using with AI agents (Claude Code / Cursor / Windsurf / Claude Desktop)

When composing UI with an AI coding agent, load the adia-ui-kit skill in the agent's harness. It encodes:

• 95-primitive catalog (which *-ui tag does what + when to use it)
• Composition patterns (admin shell, dashboards, forms, chat, editor surfaces)
• Pre-flight manifest gate (catches "imports without declared deps" before authoring)
• Plan-Execute-Verify discipline (render the result in a real demo to verify)

The skill lives at .agents/skills/adia-ui-kit/ in the repo; activation phrases include "build a page with AdiaUI", "compose this UI", "wire these components", "use AdiaUI primitives to compose…", and "what's the pattern for an admin app / dashboard / form / chat surface". Without the skill, an agent works against this README; with the skill, it has the reasoning ladder + catalog + recipes for every primitive.

CDN — no bundler (CodePen, marketing pages, static HTML)

Since v0.6.30, this package ships pre-flattened + minified bundles under dist/ that work via jsdelivr/unpkg with zero build tooling. Drop these into any HTML page:

<!-- CSS: all primitives, tokens, resets (443 KB raw / ~50 KB gzipped) -->
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/@adia-ai/[email protected]/dist/web-components.min.css">

<!-- JS: registers all 122 primitives (~250 KB gzipped via Brotli) -->
<script type="module" src="https://cdn.jsdelivr.net/npm/@adia-ai/[email protected]/dist/web-components.min.js"></script>

The @0.7 range tracks the latest 0.6.x patch automatically (won't jump to a breaking 0.8). For reproducible builds, pin an exact version instead — e.g. @adia-ai/[email protected]/dist/web-components.min.css.

For composite shells, add the corresponding bundle from @adia-ai/web-modules — see its README or the CDN usage guide. The kitchen-sink path is @adia-ai/web-modules/dist/everything.min.js (all primitives + all 4 shells; ~190 KB gzipped) — one tag for CodePen demos.

Pick ONE bundle path. Mixing (e.g. everything.min.js + a separate web-components.min.js) causes customElements.define to throw "name already defined" on dup-load. The choice tree:

• HTML-first / CodePen / marketing → @adia-ai/web-modules/everything (one tag covers everything)
• Primitives only, no shells → @adia-ai/web-components/js/bundled
• Vite/webpack/esbuild → existing root export (import '@adia-ai/web-components'); the */bundled exports are additive — bundler consumers see no change.

Quick start

ESM-only — bundlers (Vite, esbuild, webpack 5+, Rollup) resolve import for both .js and .css; in plain HTML use <script type="module"> + <link rel="stylesheet">.

import '@adia-ai/web-components';          // registers every *-ui tag (122 primitives)
import '@adia-ai/web-components/css';      // every primitive's CSS (one stylesheet)

Or per-component for tree-shaking-conscious bundles:

import '@adia-ai/web-components/components/button';        // <button-ui> only
import '@adia-ai/web-components/components/button.css';    // its CSS

Then use the tags in markup:

<card-ui>
  <header>
    <span slot="icon"><avatar-ui icon="user"></avatar-ui></span>
    <span slot="heading"><text-ui strong>Hello</text-ui></span>
  </header>
  <section>Composition works out of the box — no framework.</section>
</card-ui>

The package sideEffects entry keeps the import above from being tree-shaken; importing index.js side-effect-registers every component.

Layout

web-components/
├── core/           — Reactivity + base classes
│   ├── signals.js       signal() / computed() / effect() / batch() / untracked()
│   ├── template.js      tagged templates: html, css, repeat, stamp
│   ├── element.js       UIElement — light-DOM reactive base
│   ├── form.js          UIFormElement — form-associated + ElementInternals + validation
│   ├── provider.js      global provider registration + router-ui
│   ├── anchor.js        popover + anchor-positioning
│   ├── markdown.js      lightweight markdown renderer
│   ├── transport.js     SSE / streaming helpers for LLM adapters
│   └── data-stream.js   `data-stream-*` attribute trait (HTTP/SSE/WS,
│                        signal-backed, refcounted shared transports)
│
├── components/     — 95 *-ui custom elements (primitives)
│   └── <tag>/
│       ├── <tag>.js       class definition (extends UIElement / UIFormElement)
│       ├── <tag>.css      @scope(tag-ui) two-block: tokens + styles
│       ├── <tag>.yaml     authoring contract (props, slots, events, examples)
│       └── <tag>.a2ui.json  generated — do NOT edit
│
│  Composite shells (admin-shell, chat-shell, editor-shell, simple-shell,
│  theme-panel, gen-root, a2ui-root) ship in the sibling
│  `@adia-ai/web-modules` package — see ADR-0012 for the three-tier
│  rationale.
│
├── traits/         — 56 composable behaviors via defineTrait() + the
│                     <traits-host> wrapper for raw-HTML declarative
│                     composition. Generated catalog at _catalog.json
│                     drives the MCP get_traits tool + per-trait demo
│                     pages. Full contract in docs/specs/traits.md.
│
├── a2ui/           — deprecation shim for one release
│   └── index.js            Re-exports @adia-ai/a2ui-runtime with a
│                           one-time console.warn. Removed in 0.1.0.
│                           All actual A2UI runtime code (renderer,
│                           registry, streams, surface manifest,
│                           wiring, dockables, controllers) lives in
│                           `@adia-ai/a2ui-runtime` at packages/a2ui/runtime/.
│
└── styles/         — Global tokens and CSS layering
    ├── tokens.css              all --a-* design tokens
    ├── colors/                 primitives / semantics / scrims
    ├── typography.css, space.css, radius.css, shadow.css
    └── themes/*.css            8 themes (ocean, forest, sunset, …)

Build + dev utilities (including build-a2ui-data.mjs, qa-training.mjs, a2ui-to-html.cjs, mcp-call.cjs, mcp-pipeline.cjs, screenshot.cjs) live at the repo-root scripts/ directory rather than inside this package — they span the monorepo (MCP server, a2ui-corpus data, component catalog) and aren't scoped to web-components alone.

Using a primitive (consumer guide)

The complete consumer surface — property reactivity, event contract, form participation, lifecycle, registration, TypeScript — lives in USAGE.md. Start there if you're integrating AdiaUI into an app rather than authoring a new primitive.

Quick reference:

// Property reactivity — every prop is signal-backed
slider.value = 75;            // triggers re-render

// Event contract — CustomEvent with typed detail (since v0.4.5)
slider.addEventListener('change', (e) => console.log(e.detail.value));

// Form participation — 15 primitives extend UIFormElement
new FormData(document.getElementById('settings'));  // includes every <input-ui>, <select-ui>, etc.

// Lifecycle — UIElement provides connected/render/updated/disconnected hooks
class MyWidget extends UIElement {
  connected() { /* set up */ }
  render() { /* update DOM */ }
  disconnected() { /* tear down */ }
}

// Registration — conflict-safe via defineIfFree
import { defineIfFree } from '@adia-ai/web-components/core';
defineIfFree('my-widget', MyWidget);

TypeScript users: types ship in the package since v0.4.6. import type { UISlider, SliderChangeEvent } from '@adia-ai/web-components' for hand-typed handlers; HTMLElementTagNameMap is augmented so document.querySelector('slider-ui') returns UISlider.

Authoring a primitive

If you're contributing a new primitive (rather than consuming one), this is for you. Every component is a single-file class extending UIElement (or UIFormElement for form fields). All styling lives in a sibling .css file using two-block @scope:

@scope (button-ui) {
  :where(:scope) {
    /* Tokens only — zero specificity, parent overrides win */
    --button-bg:     var(--a-accent-bg);
    --button-fg:     var(--a-accent-fg);
    --button-radius: var(--a-radius);
  }
  :scope {
    /* Styles — consume component tokens only, never global directly */
    background: var(--button-bg);
    color:      var(--button-fg);
    border-radius: var(--button-radius);
  }
  :scope[variant="danger"] {
    --button-bg: var(--a-danger-bg);   /* variants override tokens, not styles */
  }
}

Authoring rules (enforced by ui-audit-coherence):

1. No raw colors in component CSS — every color goes through a token.
2. Variants change tokens, modes change layout. A selector that sets display, padding, flex, grid, etc. is a mode and needs a Sanctioned Mode Attributes entry in the contract doc.
3. Boolean props default to false. If the expected default is "on", flip the name (closable → permanent).
4. Event listeners in connected() have matching removeEventListener in disconnected(). Handlers are stable #field arrows, never inline.
5. Light DOM only. No ::part(), ::slotted(), shadow roots. Use attribute selectors on children: :scope > [slot="icon"].

static template is a closure — import what it references

The static template property is a regular JavaScript closure (typically a tagged template literal — () => html followed by the template body). Any signal, variable, or function it references must be lexically in scope at the file where the class is defined. This is JavaScript scoping, not anything AdiaUI-specific — but it surprises authors coming from frameworks where templates magically receive props.

// ❌ WRONG — ReferenceError at runtime: minL is not defined
//   (no import; the template function can't see minL just because
//    it's exported elsewhere in the monorepo)
class MyPanel extends UIElement {
  static template = () => html`<div>L: ${minL.value}</div>`;
}

// ✅ RIGHT — import the signal locally
import { minL } from './state.js';

class MyPanel extends UIElement {
  static template = () => html`<div>L: ${minL.value}</div>`;
}

The error surfaces in the browser console as ReferenceError: minL is not defined at first render — not at module load, not at tsc --noEmit. The trace points at the template function body, not at the missing import, which is the disorienting part.

If your primitive needs external reactive state that varies per-instance, expose it as a property rather than reaching for module-scoped signals:

// ✅ Best — per-instance reactive prop
class MyPanel extends UIElement {
  static properties = {
    minL: { type: Number, default: 0 },
  };
  static template = el => html`<div>L: ${el.minL}</div>`;
}

// Consumer:
<my-panel .minL=${minL}></my-panel>  // signal binds reactively per ADR-template-binding

The el parameter is the element instance — every signal-backed property is reactively read.

Full authoring contract: docs/specs/component-token-contract.md. The adia-ui-authoring skill encodes the 20 non-negotiable rules.

Card-n / drawer-ui composition parity

Both accept bare <header> / <section> / <footer> tags OR explicit [slot="header|body|footer"]. Both activate a 3-column header grid when any direct [slot="icon|heading|description|action"] child is present (:has(> …) — direct-child only). Drawer supports multi-section bodies with sticky header/footer. See the drawer component page for worked examples.

A2UI runtime

import { A2UIRenderer } from '@adia-ai/a2ui-runtime';
// (The old `@adia-ai/web-components/a2ui` subpath still resolves in 0.0.4
// via a deprecation shim that prints a console.warn; removed in 0.1.0.)

const renderer = new A2UIRenderer({ target: document.getElementById('canvas') });
renderer.apply({
  type: 'updateComponents',
  components: [
    { id: 'root', component: 'Card', children: ['hdr', 'body'] },
    { id: 'hdr',  component: 'Header', slots: { heading: 'Generated UI' } },
    { id: 'body', component: 'Section', children: ['btn'] },
    { id: 'btn',  component: 'Button', attrs: { variant: 'primary' }, content: 'Click' },
  ],
});

Accepts the four A2UI message kinds: updateComponents, updateDataModel, wireComponents, createSurface. The registry normalizes LLM-emitted aliases (e.g. Carousel → swiper-ui) so generated output is robust to name drift.

Data streaming via data-stream-* attributes

Any element with a settable .data property — chart-ui, table-ui, heatmap-ui, stat-ui, list-ui, etc. — can be fed from a backing source via attributes alone. No per-component opt-in:

<!-- HTTP one-shot fetch, JSON -->
<chart-ui type="area" x="month" y="revenue"
          data-stream-src="/api/revenue?range=3m"
          data-stream-path="data"></chart-ui>

<!-- HTTP polling every 5s -->
<table-ui sortable striped
          data-stream-src="/api/orders"
          data-stream-interval="5000"></table-ui>

<!-- Server-Sent Events, append on each message -->
<heatmap-ui type="matrix" rows="7" cols="52"
            data-stream-src="/sse/activity"
            data-stream-mode="sse"
            data-stream-merge="append"></heatmap-ui>

<!-- Spread a multi-property response onto the element -->
<stat-ui data-stream-src="/api/kpi"
         data-stream-target="*"></stat-ui>

Modes: HTTP (one-shot or polling), sse (EventSource), ws (WebSocket). Formats: json (default), csv, tsv, jsonl, text — auto-detected from URL extension or content-type. Two elements with attribute-identical streams share one transport (refcounted, signal-backed); explicit data-stream-id lets unrelated configs share intentionally. Programmatic access via the streams registry export from core/data-stream.js.

Implementation: core/data-stream.js (~360 lines). Full attribute table + live demos: /site/components/chart#data-stream.

Build

npm run build:components    # regenerate all .a2ui.json from YAML

The build also writes packages/a2ui/corpus/catalog-a2ui_0_9.json and catalog-a2ui_0_9_rules.txt — the flat-file catalog the MCP server and generation engine consume.

Themes, density, scale

<div theme="ocean" density="compact" size="sm">
  …all descendants re-theme / re-densify / re-scale automatically…
</div>

• [theme] — 8 themes: default, ocean, forest, sunset, lavender, rose, slate, midnight
• [density] — compact (0.85×) · spacious (1.15×)
• [size] — sm|md|lg shifts the entire typescale + component dimensions
• [radius] — sharp (0) · rounded (1) · round (2)

Each is a CSS-variable override; no class toggles, no re-imports.

Dependency direction

a2ui-compose  ──reads──>  a2ui-corpus  ←─reads──  web-components
a2ui-mcp      ──reads──>  a2ui-compose, a2ui-corpus

Web-components never imports from a2ui-compose or a2ui-mcp. The A2UI renderer consumes a protocol, not a generator — anything that emits valid A2UI messages drives it.

License

MIT