My Assetic extension filters.
CoffeeScriptPhpFilter: compiles CoffeeScript into Javascript using coffeescript-php
<?php
use Assetic\Asset\AssetCollection;
use Assetic\Asset\FileAsset;
use Assetic\Filter\CoffeeScriptPhpFilter;
$assetCollection = new AssetCollection();
$assetCollection->add(new FileAsset("foo.coffee"));
$assetCollection->ensureFilter(new CoffeeScriptPhpFilter());
echo $assetCollection->dump();