Cardbench

A Scala 3 fullstack app: Cask (JVM server) + ScalaJS + Laminar (client), as a cross-project with shared code. Scaffolded from a Hello World template.

Layout

build.sbt            # cross-project: js / jvm / shared
shared/              # code compiled for both platforms
jvm/                 # Cask web server + static assets (HTML, CSS, service worker)
js/                  # ScalaJS + Laminar client
scripts/             # dev + build helpers

Quick start (sbt only)

sbt fastLinkJS      # compile the client into jvm/.../static/dist/main.js
sbt jvm/run         # start the server
# open http://localhost:8080

Dev workflow (bloop, with hot reload)

sbt bloopInstall              # once, and after editing build.sbt
npm install                   # once (jsdom for tests, vite for asset bundling)
./scripts/dev-watch.sh        # edit & save — the browser hot-reloads itself

Tests

bloop test jvm                # JVM tests
sbt js/test                   # JS tests
./scripts/run-all-tests.sh    # everything

Build / compile

• bloop compile jvm / bloop compile js
• All warnings are errors (-Werror). Fix warnings immediately.

Production build

nixpacks.toml builds the client with fullLinkJS, bundles assets, and stages the server via sbt-native-packager (./target/universal/stage/bin/main).