code: function wrapDefine( src, path ){
  
          path = path.replace('src/', '');
  
          var deps = ['physicsjs'];
          var l = path.split('/').length;
          var pfx = l > 0 ? (new Array( l )).join('../') : './';
          src.replace(/@requires\s([\w-_\/]+(\.js)?)/g, function( match, dep ){
  
              var i = dep.indexOf('.js');
  
              if ( i > -1 ){
                  // must be a 3rd party dep
                  dep = dep.substr( 0, i );
                  deps.push( dep );
              } else {
                  // just get the dependency
                  deps.push( pfx + dep );
              }
              // no effect
              return match;
          });
  
          var data = {
              src: src.replace(/\n/g, '\n    '),
              path: path,
              deps: deps
          };
  
          return grunt.template.process(config.banner, config) +
              grunt.template.process(config.extensionWrapper, {data: data});
      }
docs: search for pragmas to figure out dependencies and add a umd declaration