Check if feature layer can be added before adding

Question

Is there any way to determine if a feature layer can be accessed by the map before adding it?

In cases where a layer is a protected resource, I don't want it sitting in the layerlist with a warning that it is not accessable.

Aeseir · Accepted Answer

close @Christer , no need for whenOnce().

It ended up being along the lines of:

try {
   await layer.load();

// execute rest of code
} catch (e) {
// manage exception
}