what does gulpfile.js do? code example

Example 1: install gulp

npm install gulp

Example 2: use gulp

npm init // create the package.json file
npm install -g gulp //If you haven't installed gulp globally before
npm install --save-dev gulp // --save-dev dependancy package.json
npm install --save-dev gulp-sass
npm install --save-dev gulp-print
your commands > gulpfile.js
gulp command