engines/swig.js
function Swig() {
  
  var opts = (app.config.engines && app.config.engines.swig) || {};
  
  this.options = protos.extend({
    cache: false
  }, opts);
  
  swig.setDefaults(this.options); // Set options for swig
  
  this.module = swig;
  this.multiPart = true;
  this.extensions = ['swig', 'swig.html'];

}
function Swig() {
  
  var opts = (app.config.engines && app.config.engines.swig) || {};
  
  this.options = protos.extend({
    cache: false
  }, opts);
  
  swig.setDefaults(this.options); // Set options for swig
  
  this.module = swig;
  this.multiPart = true;
  this.extensions = ['swig', 'swig.html'];

}
function Swig ( ) { var opts = ( app . config . engines && app . config . engines . swig ) || { } ; this . options = protos . extend ( { cache : false } , opts ) ; swig . setDefaults ( this . options ) ; // Set options for swig this . module = swig ; this . multiPart = true ; this . extensions = [ 'swig' , 'swig.html' ] ; }
Swig engine class

https://github.com/paularmstrong/swig
Swig engine class