npm run dev
Will compile scss and js with sourcemaps and copy from "src" to "dist." demo.html example to make sure things look right.
npm run start
Will launch browsersync and watch changes in scss and js in the "src" dirctory, and html files in the root directory.
npm run build
Will minify all the files and remove sourcemaps and copy to the "dist" directory. Images in assets will be optimized. Note: Depending on how many images you have it may take awhile on first run. Delete the .cache file to rerun all images.