What is the process for using data in various projections with the ESRI JS API v4.8?

Question

We have an extensive collection of GIS data sitting in ArcSDE, exposed via map and feature services, and already in a regional (projected) coordinate system. We are starting to explore building web applications using HTML 5 and JavaScript, including ArcGIS API for Javascript 4.8.

If we use an ESRI basemap (e,g, streets, satellite, hybrid, topo, gray, dark-gray, oceans, osm, national-geographic), found in the Map object > basemap property, what is the process for incorporating our feature services in SRID 'xyz' with a basemap in SRID 'abc'? What if we include multiple feature services from various federal, state and local agencies with, potentially, different SRIDs?

Answer 1

I had the same case in a project.
I've added without problems a feature service with a different SRID on Esri's OpenStreetMap basemap.

But when i couldn't retrieve geometries using the module Query, until I added this Query parameter : query.outSpatialReference = view.spatialReference;