Similarly to how Composer supports scripts to create shortcuts or outright automations for different tasks, something similar can be done within the npm ecosystem. Specifically, we are talking about task runners like Grunt and Gulp.
The DWS WP Framework uses Grunt to automate certain tasks. For example, some modules use Grunt tasks to automatically generate the POT file by scanning the code for translatable strings.
The purpose of this documentation is not to teach you how to use task runners, but we strongly encourage you learn how to use them. It's pretty simple really and they can automate some pretty difficult tasks.