(v4.0.1)
You need to have Java installed before continuing, as the browser refresh module requires it. Additionally, all the required Node modules need to be installed before you can use this template. From the root folder of this project, type npm install. This will create a folder called node_modules and download the plugins listed under the devDependencies section in the package.json file. If you encounter an ERR! message about EACCES, then you’ll need to run the command as the super user: sudo npm install. Because the Gulp tasks amount to about 112MB, expect to wait.
Typing gulp --tasks, or simply gulp, will provide you with a list of tasks included in gulpfile.js. Tasks such as build and serve invoke other tasks and are nested in the output of gulp --tasks and are executed in <series>.
Each task can be run on its own. For example, if all you want to do is validate your HTML, you can type gulp validateHTML.
All your work must be added to the sub-folders under the dev folder: your markup in html, your Sass/CSS in styles, your JavaScript in scripts, and your images in img.
During development, run gulp serve, which runs multiple development-related tasks, then launches your default browser and reloads on file changes.
For production-ready projects, run build, which creates a folder called prod. This is the folder you’d upload to your server if you were going live with your project.