Pre-installing requirements for building Inky

I am not an experienced node developer -- but I'm familiar with e.g. "requirements.txt" in Python, which allow you to automatically install dependencies.

When building Inky with BUILD_PACKAGE after installing node/electron on a new machine, BUILD_PACKAGE failed with:

> electron-packager: command not found
> appdmg: command not found

so:

npm install -g electron-packager
npm install -g appdmg.

This fixed the problem, but I wonder if there is already a setup script that is the normal way of indicating that these are required, or if there is a typical node way of doing this that could be added. Or documentation.

Could I have missed clicking "INSTALL_AND_RUN" the first time, and would that have installed them automatically?