put exception of just one folder in src of gulp

I would like to put gulp in a laravel project, and before uploading this project to production I always need to delete a folder called config. How do I do that when creating a new folder (which would be the production folder) read the whole folder unless this folder specifies? The folder structure is as follows:

projeto1
projeto2
    app
        config
        storage
    models
    controllers
gulpfile.js