var url = Script.resolvePath('intervalBugEntity.js');

 var props = {
     type: 'Box',
     dimensions: {
         x: 1,
         y: 1,
         z: 1
     },
     script: url,
     position: {
         x: 0,
         y: 0,
         z: 0
     },
     color: {
         red: 0,
         green: 255,
         blue: 0
     }
 };

 Entities.addEntity(props);