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openspec/changes/enterprise-react-font-decompress/proposal.md

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+# OpenSpec Change: enterprise-react-font-decompress
+
+- **Change ID**: enterprise-react-font-decompress
+- **Package**: `@suaveplan/react-font-decompress`
+- **Category**: react
+- **Target path**: `react/media/react-font-decompress`
+- **Status**: PROPOSED
+- **Date**: 2026-04-24
+- **Reference spec**: `/mnt/s/web/suaveplan/enterprise/react-font-decompress.md`
+
+---
+
+## Summary
+
+Deliver `@suaveplan/react-font-decompress` on genesis from scratch at enterprise quality. Thin React adapter around `@suaveplan/font-decompress` for loading binary-packed BTF fonts in the browser (Three.js/R3F). Ships `useFont(url)`, `useFonts(urls)`, `BinaryFontLoader`, and `createBrowserLoader()`. Genesis lifts coverage from effectively 0% on hook files to 100% by writing real tests.
+
+---
+
+## Current-state audit (genesis)
+
+Package does not exist on genesis — fresh build.
+
+---
+
+## Available workspace deps on genesis
+
+| Package | Role |
+|---|---|
+| `@suaveplan/error` (`workspace:^`) | `FontError` |
+| `zod` (`catalog:forms`) | Config schemas |
+
+External: `tslib catalog:build`. React 18 peer.
+
+---
+
+## Preserved public API surface
+
+```ts
+useFont(url: string): { font: TypefaceFont | null; loading: boolean; error: Error | null }
+useFonts(urls: string[]): { fonts: TypefaceFont[]; loading: boolean; error: Error | null }
+BinaryFontLoader
+createBrowserLoader(): string   // inline script string
+// Re-exports from @suaveplan/font-decompress
+PathCommand, TypefaceFont
+```
+
+---
+
+## New additions for genesis
+
+1. **`FontError`** — codes: `FONT_LOAD_FAILED`, `FONT_DECODE_FAILED`.
+2. **Real hook tests** — no "is a function" stubs; tests use `@suaveplan/testing-dom` and real DI.
+3. **Module-level cache** — `BinaryFontLoader` uses a `Map<url, Promise<TypefaceFont>>` to deduplicate concurrent loads.
+4. **Stories** — `useFont` playground, `useFonts` multi-URL playground.
+
+---
+
+## File layout
+
+```text
+react/media/react-font-decompress/
+  package.json
+  tsconfig.json
+  vitest.config.ts
+  src/
+    index.ts
+    hooks/
+      use-font/ (ts + md + test + stories + index)
+      use-fonts/ (ts + md + test + stories + index)
+    loader/
+      binary-font-loader/ (ts + md + test + index)
+      browser-loader/ (ts + md + test + index)
+    types/
+```