options.md

Option	Values (default in bold)	Description
minify	true | false | Array	Enable or disable minification. Optionally specify an array of advanced minification parameters. Currently the only advanced option is 'colors', which will compress all color values in any notation.
formatter	block | single-line | padded	Set the formatting mode. Overrides minify option if both are set.
newlines	use-platform | windows/win | unix	Set the output style of newlines
boilerplate	true | false | Path	Prepend a boilerplate to the output file
versioning	true | false	Append a timestamped querystring to the output filename
vars	Array	An associative array of CSS variables to be applied at runtime. These will override variables declared globally or in the CSS.
cache	true | false	Turn caching on or off.
output_dir	Path	Specify an output directory for compiled files. Defaults to the same directory as the host file.
output_file	Output filename	Specify an output filename (suffix is added).
asset_dir	Path	Directory for SVG and image files generated by plugins (defaults to the main file output directory).
stat_dump	false | true | Path	Save compile stats and variables to a file in json format.
vendor_target	"all" | "moz", "webkit", ... | Array	Limit aliasing to a specific vendor, or an array of vendors.
rewrite_import_urls	true | false | "absolute"	Rewrite relative URLs inside inlined imported files.
import_paths	Array	Additional paths to search when resolving relative import URLs.
plugins	Array	An array of plugin names to enable.
source_map	true | false	Output a source map (compliant with the Source Map v3 proposal).
context	Path	Context for importing resources from relative urls (Only applies to `csscrush_string()` and command line utility).
doc_root	Path	Specify an alternative server document root for situations where the CSS is being served behind an alias or url rewritten path.
settings	Array	An associative array of plugin and environment settings. Used primarily for plugin configuration.