exemple :
main.styl
.icon,.icon32{display:inline-block;width:16px;height:16px;margin:2px 3px 2px 0;@extend .hiddenText;font-size:0;}
icon16($name,iconName=$name) .icon.{$name} sicons16(iconName)
sicons16(fileIconName) sprite i16 '../images/'+fileIconName+'.png' 'dimensions:false'