See autoprefixer
use ZaCoZa\Assetic\Filter\AutoprefixerFilter;
$browsers = array('> 1%', 'last 2 versions', 'Firefox ESR', 'Opera 12.1');
new AutoprefixerFilter('/usr/bin/autoprefixer', $browsers);
Assetic is not able do detect change in @import files wen you use Less. Here comes the fix!
This filter take a third parameter which is an array of file paths. The files provided this way will be touch()
by the filter to change their access time. So Assetic will detect a change and will rebuild the asset.
use ZaCoZa\Assetic\Filter\LessFilter;
// The Main Less File with your @import files
$myMainLessFile = __DIR__.'/assets/styles/main.less'
new LessFilter('/usr/local/bin/node', // The path to the node binary
array('/usr/local/lib/node_modules'), // An array of node paths
array($myMainLessFile) // MAGIC: An array of file paths you want to touch()
);