fix: support Android font assets in Skia

[whydidoo]

Summary

Fixes #1472.

Skia loads bundled Android fonts from res/raw, while Re.Pack previously emitted them only to res/font.

• Emit an additional res/raw copy for TTF, OTF, and TTC fonts, preserving existing R.font and XML font-family references.
• Generate res/raw/keep.xml so resource shrinking preserves assets loaded by name from JavaScript.

Test plan

• Tested real TTF, OTF, TTC fonts and images with Skia 2.11.2 on Android 13 and iOS 26.5 using Metro, Webpack, and Rspack 2.1.3.
• Verified Android R.font and XML font-family references in release builds.
• Verified resource shrinking with assets referenced only from JavaScript; removing keep.xml caused those resources to be removed.

[changeset-bot]

🦋 Changeset detected

Latest commit: 38fcef1

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 6 packages

Name	Type
@callstack/repack	Patch
@callstack/repack-plugin-expo-modules	Patch
@callstack/repack-plugin-nativewind	Patch
@callstack/repack-plugin-reanimated	Patch
@callstack/repack-dev-server	Patch
@callstack/repack-init	Patch

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[dannyhw]

The keep file works, but the way it's added doesn't quite match how AssetsCopyProcessor is built. Everything else in the class is a job that enqueueChunk pushes onto queue, and execute() just runs the queue. Here execute() takes on Android-specific logic, and the keep-file write waits on Promise.all(tasks) even though it doesn't need the copied files. On top of that, isRemote exists only so the remote processors can opt out.

How about making it a normal queued job behind its own method, called only for the local processor?

const androidResourceRegExp = /^(drawable|raw|font)(?:-[^/]+)?\/([^/]+)\.[^/.]+$/;

// Resources resolved by name at runtime are invisible to the resource shrinker
// (mirrors Metro's createKeepFileAsync).
enqueueAndroidKeepFile() {
  if (!this.androidResources.size) return;
  const keepPath = path.join(this.config.assetsDest, 'raw', 'keep.xml');
  const resources = [...this.androidResources].sort().join(',');
  this.queue.push(async () => {
    await this.filesystem.promises.mkdir(path.dirname(keepPath), { recursive: true });
    await this.filesystem.promises.writeFile(
      keepPath,
      `<resources xmlns:tools="http://schemas.android.com/tools" tools:keep="${resources}" />\n`
    );
  });
}

// OutputPlugin.ts, after the localChunks loop
localAssetsCopyProcessor?.enqueueAndroidKeepFile();

With that, execute() stays as it is on main and isRemote can be removed. Separately, OutputPlugin creates a new processor on every compilation, so the androidResources.clear() and the "earlier execution" test aren't needed.

[whydidoo]

Thanks, Danny! That’s a really good point. I’ve updated it as you suggested