expo-alphatab: alphaTab inside an Expo / React Native app (offline, WebView bridge)

[juapperez]

I ship an iOS app, Fretbox, that opens Guitar Pro and MusicXML files and plays them with alphaTab. Getting alphaTab to run inside an Expo / React Native app took three workarounds (Metro refuses to bundle alphaTab.min.js as an asset, the WebView needs real file:// URIs for engine, font and soundfont, and a typed command/event bridge), so I extracted them into a small MIT package:

https://github.com/juapperez/expo-alphatab

It copies the three files from @coderline/alphatab into the app (with their licences), writes the page at first start and exposes load / playPause / speed / loop / metronome / countIn / mute / solo / zoom / seek plus the usual events. Production on iOS since September; Android untested.

Thank you for alphaTab. Two small docs PRs are open as a thank-you (CoderLine/alphaTabWebsite#232 and one on this repo). Happy to answer questions about the React Native setup here.

AI-assisted (alphatab-ai-authored-v1) — drafted with help of an AI agent; the setup, the package and the app are mine.