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Mobile Preview

A lightweight phone UI wrapper around an Expo web preview.

The app does not emulate native APIs. Expo handles the runtime; this project only displays the Expo web output inside a phone-shaped frame.

Local Development

Start your Expo web app on port 3001, then run:

npm install
npm run dev

Open the wrapper at http://localhost:3000. It defaults to loading Expo web through /__expo_preview/.

To target a different local Expo web URL:

EXPO_WEB_URL="http://localhost:3002" npm run dev

Docker

Build the image:

docker build -t learn_mobile-preview .

Run it:

docker run --rm -p 3000:3000 learn_mobile-preview

Open http://localhost:3000. The phone iframe points at /__expo_preview/, which the Vite server proxies to Expo web at http://localhost:3001 by default. In Docker, that default only works when Expo is reachable from the container as localhost:3001.

To target a different Expo web URL:

docker run --rm -p 3000:3000 -e EXPO_WEB_URL="http://host.docker.internal:3001" learn_mobile-preview

Or use Docker Compose so the port mapping is stored in config:

docker compose up

Container Registry

GitHub Actions publishes the image to GitHub Container Registry on pushes to main, develop, and v* tags:

ghcr.io/<owner>/<repo>

Pull requests build the image without pushing it. If the package appears private in GHCR, change the package visibility to public in the repository's package settings.