Get coded domain for custom widget

[Mateo_Neira]

I have a custom widget that filters values using a drop-down menu. I'm populating the values for the drop-down menu using the DataSoure interface from jimu-core. However, my data has coded value domains that I need to fetch, but can't find a way to do so with the DataSource interface. 

[ABishop]

Hello,

Is there a reason you are using DataSource interface instead of an ArcGIS feature service?

[Mateo_Neira]

I'm not very experienced, and most of the examples of creating custom widgets on experience builder work with using the data source interface from jimu-core. To my understanding it helps making sure the data sources (ej. queries) are syncronized across the different widgets. 

[ABishop]

I'm assuming that since you are using the Experience Builder web app, you have an ArcGIS Online account with license?  The GIS data you are serving... is it published as a service?