SCSS is an extension over CSS, that can be compiled down to plain CSS.
Add this to the filetype_extensions.conf file (… means existing data):
[Extensions] ... SCSS=*.scss ... [Groups] ... Markup=SCSS ...
And create a new filedef named filetypes.SCSS.conf with the following contents:
[styling=CSS] [keywords=CSS] [lexer_properties=CSS] lexer.css.scss.language=1 [settings=CSS] lexer_filetype=CSS tag_parser=CSS extension=scss # SCSS has single-line comments in addition to CSS multi-line ones comment_single=// [build_settings] # %f will be replaced by the complete filename # %e will be replaced by the filename without extension # (use only one of it at one time) compiler=sass -c "%f" linker=sass --style expanded "%f" "%e.dev.css"