generator-scratch/app/templates/scratch/grunt/clean.js

Scratch is a starter theme generator based on _s and Foundation. It's a theme meant for hacking so don't use it as a Parent Theme. Instead try turning it into the next, most awesome, WordPress theme out there.

module.exports = {
	/**
	 * grunt-contrib-clean
	 *
	 * Clean files and folders.
	 *
	 * @link https://www.npmjs.com/package/grunt-contrib-clean
	 */
	assets: ['assets/css', 'assets/js'],
	css: ['assets/css'],
	dist: ['dist/<%%= package.name %>']
};