@particle-academy/fancy-cms-ui

Host-resolved responsive images

An image node can name props.asset: "campaign/hero". The host supplies a synchronous imageResolver; the document does not supply image URLs, dimensions, variants or sizes for that node. Missing handles/resolvers or invalid metadata render an inert image with its alt/loading/fit preserved. An asset node never falls back to props.src, including an empty asset handle.

import { CmsPage, type ImageAsset, type ImageAssetResolver } from "@particle-academy/fancy-cms-ui/react";

// An ordinary shop, not tied to flabs, its storage layout or any database.
const assets: Record<string, ImageAsset> = {
  "campaign/hero": {
    src: "https://images.shop.example/campaign-1536.jpg", width: 1536, height: 1024,
    variants: [
      { src: "https://images.shop.example/campaign-480.jpg", width: 480, height: 320 },
      { src: "https://images.shop.example/campaign-960.jpg", width: 960, height: 640 },
    ],
    sizes: "(max-width: 640px) 100vw, 640px",
  },
};
const imageResolver: ImageAssetResolver = handle => assets[handle] ?? null;
<CmsPage doc={doc} imageResolver={imageResolver} />;
// Image props: { asset: "campaign/hero", alt: "Products on a workbench", fit: "cover", loading: "eager" }

Pass the same immutable metadata to SSR/hydration, CmsRegion, RenderNode, Editor, Canvas and EditablePage. The two inspectors keep asset handles in the operation spine. Keep the resolver a closed manifest lookup, with no network or URL passthrough. It receives only a literal handle, never a binding object.

Width/height are intrinsic positive integers (up to1,000,000). Up to16 declared variants have distinct widths and URLs; they are copied/sorted into width-based srcSet. Nonempty host sizes is required with variants. Sources are root-relative or HTTP(S), without protocol-relative URLs, backslashes, controls, spaces or raw commas (percent-encode them). A single source emits width/height without inventing srcset/sizes. Invalid metadata refuses the whole asset. Eager responsive preload hints match React19, including deduplication by variants AND sizes.

Existing image nodes with no asset retain their legacy src behavior; authored width/srcSet/sizes props do not become trusted metadata. A host requiring closed assets must validate stored/candidate documents and allow only its catalogue's handles. The host owns authorization, file serving, integrity and CSP; approved CDN URLs work without a flabs dependency. No assets are generated or fetched by the package.

Native icons

Native icon leaves use a closed catalogue exposed by iconNames(). Set literal props { name: "receipt-text", decorative: true }, or set decorative: false with a nonblank label (up to1024 UTF-8 bytes). Size the one-em glyph with responsive style.fontSize and colour it with style.color and existing theme tokens. Documents cannot provide SVG, paths, bindings or extra icon attributes. Add and both inspectors use the existing controlled operation spine. Clearing an accessible label makes the icon decorative. The same generated SVG data ships in fancy-cms for byte-identical rendering. The wrapper follows Fancy Icon conventions without importing react-fancy; that peer stays optional and no runtime dependency is added.

The full Lucide 0.511.0 catalogue that Fancy resolves contains 1,803 names/aliases and 1,594 distinct glyphs. searchIcons(query,cursor) (PHP twin: Agent::icons(query,cursor)) returns at most 20 names, total and nextCursor; expose it as cms_icons rather than putting all names in an agent prompt. Query accepts up to 128 ASCII letters, digits, hyphens and spaces; cursor is a nonnegative integer. Exact matches come first, then lexical order.

Glyphs are opt-in data. Static consumers import only the glyphs they need:

import { CmsPage } from "@particle-academy/fancy-cms-ui/react";
import fileText from "@particle-academy/fancy-cms-ui/icons/file-text";
import receiptText from "@particle-academy/fancy-cms-ui/icons/receipt-text";
import calculator from "@particle-academy/fancy-cms-ui/icons/calculator";
const icons = { "file-text": fileText, "receipt-text": receiptText, calculator };
// Use the same icons for server rendering and browser hydration.
<CmsPage doc={doc} icons={icons} />;

For arbitrary authored pages, await loadIcons(names) from ./icons outside rendering, collecting names from the document's icon nodes. That separate entry uses per-glyph dynamic chunks; ./icons/all is an explicit full-set opt-in. Pass the same preloaded map to CmsPage, CmsRegion, RenderNode, Editor, Canvas and EditablePage. Omitted glyphs render empty; the renderer never fetches or changes SVG after hydration. Main/React/editor entries include the closed name index, and no glyph catalogue or runtime react-fancy import.

npm run icons:generate regenerates both workspace twins from the Lucide artifact resolved by installed react-fancy. npm run icons:check is an offline release check: source version/range, content SHA256, PHP/JS data and licence must match. See NOTICE, licenses/LUCIDE-LICENSE and icons/metadata.json. Regenerate after changing Fancy's Lucide version. Use npm run icons:check:pair for a release gate that requires the PHP twin checkout; the ordinary check/test also works in a standalone UI checkout and reports when the twin is absent.

frame and shape can mark abstract artwork with literal boolean props.decorative: true. Their subtree may contain only frames, shapes and decorative icons without actions. decorationError(doc.nodes) exposes the same validation used by the reducers and renderer. Meaningful inserts, subtree moves, prop and action edits are refused without mutation. Invalid stored compositions fail visible when rendered directly; no cached verdict can hide content added later. False or omitted flags stay visible. The prop is reserved for frames, shapes and icons; rename metadata using that key on other node types.

⚠️ Early-release BETA. This package is young and moving fast — expect rough edges, gaps, and breaking changes between 0.x releases. If you hit anything odd (bugs, missing pieces, confusing docs), please report it at github.com/Particle-Academy/fancy-cms-ui/issues — every discovery helps.

The editor + isomorphic renderer for fancy-cms — an extendable inline-WYSIWYG website + app-shell builder for Laravel, built on the Fancy UI suite.

Status: Phase 0 done; Phase 1 in progress. Ships the foundation the rest of the system types against — the Stages document model, the PageOp op-spine + pure reduce, and the JS style→CSS emitter (one half of the dual-emitter pair; the other lives in the PHP particle-academy/fancy-cms) — the React renderer (./react: CmsPage / CmsRegion) shared by the editor and published islands, and the WYSIWYG editor (./editor: layers · canvas with select + drag-move · inspector · snapshot undo/redo). Motion engine, addon SDK, file manager, and the opt-in /collab + /agent layers land in later phases.

Architecture & plan: .ai/plans/fancy-cms.md in the fancy.agi envelope.

Use

npm install @particle-academy/fancy-cms-ui

Everything ships from the main entry — the renderer (CmsPage / CmsRegion), the WYSIWYG Editor, and the framework-agnostic spine (document model, ops, reduce, emitDocCss):

import { useState } from "react";
import { CmsPage, Editor, emptyDoc, reduce, type PageDoc } from "@particle-academy/fancy-cms-ui";

// A tiny Stages document — every mutation is a PageOp through the pure reduce.
let initial = emptyDoc("home");
initial = reduce(initial, {
  t: "insert_node",
  node: { id: "s1", type: "section", parent: null, order: "a", layout: "stack",
          props: {}, style: { base: { padding: { value: 32, unit: "px" } } } },
});
initial = reduce(initial, {
  t: "insert_node",
  node: { id: "h1", type: "heading", parent: "s1", order: "a",
          props: { content: "Hello" }, style: { base: { fontSize: { value: 32, unit: "px" } } } },
});
initial = reduce(initial, {
  t: "insert_node",
  node: { id: "p1", type: "text", parent: "s1", order: "b",
          props: { content: "Built with fancy-cms." }, style: { base: {} } },
});

// Author: the full editor (layers · canvas · inspector, snapshot undo/redo).
function Author() {
  const [doc, setDoc] = useState(initial);
  return <Editor defaultValue={doc} onChange={setDoc} />;
}

// Publish: render the document (or one subtree via <CmsRegion doc={doc} root="s1" />).
function Page({ doc }: { doc: PageDoc }) {
  return <CmsPage doc={doc} />;
}

Lean subpath entries also exist: @particle-academy/fancy-cms-ui/react (renderer only) and @particle-academy/fancy-cms-ui/editor (the editor, plus the inline EditablePage — the one component that additionally requires the optional @particle-academy/react-fancy peer).

A server-owned document

Use value when a server or another writer owns the document. The canvas shows accepted host state. Inspector fields keep local drafts so typing continues without reverting while a save is pending. A field proposes a native PageOp through onOp and a reduced document through onChange after 250 ms without typing, or on blur. IME composition finishes before submission. Choose one callback to submit writes; the other can observe proposals. Incoming values do not echo themselves through these callbacks and preserve the selected handle.

import { Editor, type PageDoc, type PageOp } from "@particle-academy/fancy-cms-ui";

function SharedAuthor({ doc, pending, submit }: {
  doc: PageDoc;
  pending: boolean;
  submit: (op: PageOp) => void;
}) {
  return <Editor value={doc} onOp={submit} disabled={pending} />;
}

The host validates and authorizes each operation, pins it to the current server revision, and supplies accepted state through value. Keep pending true while a write is being accepted, and clear it after publishing the accepted or rejected server state. disabled blocks structural edits and draft submission; controlled inspector fields remain editable. Additional typing stays buffered until the prior field value is acknowledged. Inspector proposals are serialized even if the host omits disabled; the host must still serialize and revision-pin all writes. An operation-only host can omit onChange.

Incoming state updates other fields immediately. If it changes a drafted field, the draft stays visible with a conflict. Choose Use server value to discard it or Keep draft to submit it against the current state. The editor never silently retries a conflict. Clearing pending without accepting the field, or receiving no acknowledgement for 10 seconds, also retains the draft and surfaces a decision. Node removal retains copyable draft text without recreating the node. Keep this editor mounted while drafts or writes are outstanding; navigation/unmount is owned by the host.

Controlled editors disable local snapshot Undo/Redo, since restoring an old snapshot could overwrite another writer. The defaultValue mode retains local history and reports document changes through onChange. Choose one ownership mode for an editor's lifetime. In uncontrolled mode, disabled blocks property edits as well.

Styling

There is no stylesheet to import. Authored page styles are compiled by the deterministic CSS emitter and injected as an inline <style data-cms-styles> tag by CmsPage / CmsRegion (set includeStyles={false} when the host emits CSS itself, e.g. via the PHP renderer). Editor chrome is self-contained inline styles. EditablePage's context menu comes from @particle-academy/react-fancy, whose Tailwind classes your app's Tailwind build compiles as usual.

What's here (Phase 0)

src/
├── document/
│   ├── types.ts      Stages model: PageDoc, Node, Constraints, StyleProps, …
│   ├── ops.ts        PageOp union + envelope
│   ├── reduce.ts     pure/total reduce(doc, op) + invert(doc, op) for undo
│   └── fractional.ts collab-safe ordering keys (keyBetween)
├── render/
│   └── css.ts        deterministic style/layout/constraints → CSS (static subset)
├── react/            the React renderer (the ./react entry)
│   ├── registry.tsx  element registry (text/image/section/stack/grid/…)
│   ├── RenderNode.tsx recursive node → DOM with data-cms handles + islands
│   └── CmsPage / CmsRegion  full page + embeddable subtree
└── editor/           the WYSIWYG editor (the ./editor entry)
    ├── state.ts      pure editor reducer (ops + snapshot undo/redo + selection)
    ├── useEditor.ts  the editor hook
    └── Editor / Canvas / LayersPanel / Inspector

The reduce function is pure and total (an invalid op is a logged no-op), which is what makes undo, revisions, collaboration, and agent edits all flow through one spine. The CSS emitter is deterministic so the PHP emitter can produce byte-identical output — verified by the parity harness.

Principles

Fonts: see host-resolved fonts for structured font references, same-origin resolution and the opt-in Inter 4.1 bundle.

Building and publishing pages: see the webmaster guide for what the editor inspectors can and cannot edit, client-side image and font resolvers, strict-CSP rendering, accessibility and responsive checks, and pre-publish verification. The server side is covered by the matching guide in particle-academy/fancy-cms.

• Guest, not host — adopted per-surface (route / region / slot).
• Human+ is opt-in — core works single-user with no websockets or agents.
• Zero third-party runtime deps.

MIT © Particle Academy

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