I try to use yeoman but I don\'t know how to use my own sass files with it.
With
grunt server
Sass files are watched and compiled into
The actual magic for development is happening in
mountFolder(connect, '.tmp'),
for the connect-livereload middleware for grunt-contrib-watch.
This makes the local server also serve the contents of the .tmp folder, which is why you can reference styles/main.css and get .tmp/styles/main.css in return.
useminPrepare is usually never called in the server task.