Run npm install
to download all dependencies.
Set up a directory structure like so:
root/
|-dist/
|-css/
|-main.css
|
|-src/
|-scss/
|-main.scss
|
|-Gruntfile.js
|-package.json
I.e.: mkdir -p dist/css/ && mkdir -p src/scss/
Alternatively, you could edit Gruntfile.js
and provide your own directory structure.
Run grunt watch
Write your SCSS code in src/scss/main.scss
, grunt will automatically detect changes and compile to CSS and run autoprefixer.