As long as this is unstable library and there is no npm package you should depend on particular version.
Use git tags:
npm install -S https://github.com/ethereumproject/emerald-js.git#v0.0.4
This will link v0.0.4
emerald-js uses Jest for its test suite. To run tests in the console:
npm run test
We use AirBnB JavaScript Style Guide and Flow for static type checking.