Enigma is Qlik's open-source promise wrapper for the engine. You can use enigma directly when you're in the Mashup API, or you can load it as a separate module. It's essential to also load the correct schema whenever you load enigma.js. The schema is a collection of the available API methods that can be utilized in each version of Qlik Sense. This means your schema needs to be in sync with your QS version.

The following example will connect to a Demo App using enigma.js and will retrieve a list of all available fields and write them out to the console:

define(function () {
  return function () {
    require(['qlik','enigma','autogenerated/qix/engine-api'], function (qlik, enigma, schema) {
//The base config with all details filled in 
var config = { 
     schema: schema,
     appId: "My Demo App.qvf",
     session:{
         host:"localhost",
         port: 4848,
         prefix: "",
         unsecure: true,
     },
}
//Now that we have a config, use that to connect to the //QIX service.
enigma.getService("qix" , config).then(function(qlik){
     qlik.global.openApp(config.appId)
    //Open App
      qlik.global.openApp(config.appId).then(function(app){
        //Create SessionObject for FieldList
        app.createSessionObject( {
          qFieldListDef: {
              qShowSystem: false,
              qShowHidden: false,
              qShowSrcTables: true,
              qShowSemantic: true,
              qShowDerivedFields: true
          }, qInfo: {
              qId: "FieldList",
              qType: "FieldList"
          }
      } ).then( function(list) {
          return list.getLayout();
      } ).then( function(listLayout) {
          return listLayout.qFieldList.qItems;
      } ).then( function(fieldItems) {
         console.log(fieldItems)
      } );
      })
}
})}})