gulpfile.js folder, the files you should edit, are the files that end on ".config.js".
project.config.js is the project-specific configuration. This file will be the same on each environment.
config.js file is the default environment-specific configuration. If you want to change something inside this file for your local setup, don’t. Instead, you should copy this file and name it
local.config.js file will be git-ignored by default, so each environment can create its own