Re: Is there a good tutorial with examples for JSInterop available somewhere ?

The most in-depth documentation is already linked at the very bottom of the corresponding gwtproject.org page:

https://docs.google.com/document/d/10fmlEYIHcyead_4R1S5wKGs1t2I7Fnp_PaNaa7XTEk0/edit#heading=h.828haudjx0kl

In addition there is a document which talks about union types in elemental2 which can be helpful as well if you have to deal with union types: 

https://docs.google.com/document/d/14mQeAGQ9M_5uTTUbzRQzCYETA887dTO-xFLtQhgUXXk/edit

In general if you want to consume existing JS API then just model that API using @JsType(isNative = true, ...) annotated classes and for callbacks use @JsFunction annotated interfaces. Your small example could be something like:

@JsType(isNative = true, ....) // TODO: namespace, name
class Items {
  native void on(String event, ItemsEventCallback callback);
}

@JsFunction
@FunctionalInterface
interface ItemsEventCallback {
  void onEvent(Object event, Object properties); // TODO: parameter types should probably of a specific type but I don't know the JS library so have used Object here.
}

-- J.

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