I use node-sass to compile all my Sass files to a master.css. This works well but now I want to add prefixes. I would like to use only the npm, no Gulp or Grunt. Here my package.json file: { "name": "xxxxxx.com", "version": "1.0.0", "description": "", "watches": { "sass": "src/scss/**" }, "scripts": { "sass": "node-sass src/scss/master.scss -o dist/css/ --style compressed", "prefix": "postcss --use autoprefixer dist/css/master.css -d dist/css/master.css", "dev": "rerun-script" }, "author": "Jan", "license": "ISC", "devDependencies": { "autoprefixer": "^6.3.1", "browserify": "^13.0.0", "clean