gulpfile.js
core
.gitignore
local.config.js

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config.js
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index.js
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local.config.js
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project.config.js

Inside the 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.

The 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.

The local.config.js file will be git-ignored by default, so each environment can create its own local.config.js file.