Check task commands list npm run or gulp -T
yarn or npm install
npm start or yarn start
It's a common command when developing,
which includes build & serve & watch.
npm run build
npm run imgmin
npm run deliver
You can take out compressed and optimized js/css/image files.
npm run sprite
Sprite images are created from Images which you put in src/sprite_src with directory name,
and will be put them away at src/sprite_dest.