modules/jooby-assets/src/main/java/org/jooby/assets/AssetProcessor.java
public String process(String filename, String source, Config conf) throws Exception {
    return process(filename, source, conf, getClass().getClassLoader());
  }
public String process(String filename, String source, Config conf) throws Exception {
    return process(filename, source, conf, getClass().getClassLoader());
  }
Method that processes the provided source and returns the processed contents.

@param filename name of the file
@param source   contents of the file
@param conf     application configuration
@return the processed file contents
@throws Exception if any error occurred