You need a .env file in the source directory with content similiar to this:

EMSDK_HOME=/home/lemourin/Projects/emsdk
HOSTNAME=http://localhost:8000

• EMSDK_HOME points to the directory with emsdk checked out and installed from here: https://github.com/emscripten-core/emsdk
  • emsdk installation boils down to running ./emsdk install latest && ./emsdk activate latest in repos' directory
• HOSTNAME is the url at which the cloudstorage-js repo is exposed.

To test the app, run npm install && npm run build:all and serve the repository with any http server, e.g. with python3 -m http.server.