Function to get the output directory of a Single Source Layout. This function is the equivalent of the method .sslOutputDir()

//Load the first SSL into the variable ssl
var sslmngr = currentProject.SSLManager;
for(var i = 1; i <= sslmngr.count; i++) {
  var ssl = sslmngr.item(i);
  break;
}
//Now get the output directory
var dir = ssl_outputDir(ssl);