if layer or any of the features not found
// returns the features of layer id="3" and feature id="4", "5" and "6"
JMap.Feature
.getByIds(3, [4, 5, 6])
.then(features => console.info("Features has been fetched", features))
.catch(error => console.error("An error occured", error))
JMap.Feature.getByIds
Returns the features (EPSG:4326 projection) for the given layer and feature ids.