Type: String
Default: null
Prefix the compressed source with the given banner, with a linebreak inbetween.
Type: String Number
Default: '*'
To keep or remove special comments, exposing the underlying option from clean-css.. '*' for keeping all (default), 1 for keeping first one, 0 for removing all.
Choices: false, 'min', 'gzip'
Default: false
Either do not report anything, report only minification result, or report minification and gzip results.
This is useful to see exactly how well clean-css is performing but using 'gzip' will make the task take 5-10x longer to complete.
Example ouput using 'gzip':
Original: 198444 bytes.
Minified: 101615 bytes.
Gzipped: 20084 bytes.