CodeRunner Native

Expo React Native code runner for Python and JavaScript (v1.1).

Highlights

• Offline CodeMirror editor (vendored, no CDN)
• Offline Python runtime cache (downloads once, then file:// boot)
• input() / prompt() console bridging
• Projects save/load/import/export/share
• Lessons with output checking
• Packages catalog + micropip
• Hardened JS sandbox (no fetch/XHR), run timeouts
• Console copy/collapse, error-line jump, stdin history
• Editor/console split controls and toolbar Run/Stop

Quick start

npm install
npm run start

First Python launch may download ~50MB into app storage for offline reuse. The editor works offline immediately.

Scripts

Script	Purpose
npm run typecheck	TypeScript
npm test	Unit tests
npm run embed:codemirror	Regenerate offline editor assets
npm run apk:release	Signed Android APK
npm run eas:ios:preview	iOS preview via EAS

Maestro smoke

maestro test maestro/smoke.yaml

Architecture

See docs/ARCHITECTURE.md.