Pure.. Functional..
Haskell + Snap + MongoDB + TypeScript + React
https://battleship-fp.com/

Actualy, client has some impurity. It uses not immutable state. I don't know how to avoid it. Maybe you can help me.

To build client:

yarn install
yarn build

To build server:
Copy devel.cfg.template to devel.cfg. Fix parameters.

cabal install
cabal run --p 9000

In browser: http://localhost:9000/

In case you want to use HTTPS:
After cabal install and then ./prepare_with_ssl.sh. it will create ssl keys and build snap with -fopenssl option. To run server ./run_ssl.sh and then in browser: https://localhost:9443/

To build server for linux you can use special docker image.
Just run docker-composer up from deploy folder. Check ./deploy/build.sh for more information.