Use Autoprefixer in npm without Gulp

i´m new to node.js and npm.

Do i need to install all these dependencies and devDependencies to use autoprefixer in node, although i don´t use gulp at all?

http://ift.tt/1wjT1jx

I want to use it in node like this:

     "scripts": {
       "build:css": "autoprefixer -b 'last 2 versions' <assets/styles/main.css | cssmin > dist/main.css"
     }

as described here: http://ift.tt/1z1Jy3h

but i get an error saying that the system cannot find a file, don´t know which file it means :(

i installed it with

npm install autoprefixer --save-dev