# 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.

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## Current-state audit (genesis)

Package does not exist on genesis — fresh build.

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## 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/
```