Where should I register a listener for mxGraphModel events on diagrams.net?

[Admin Korgrok]

I want to add a listener for mxGraphModel JavaScript events. How do I expose the model, so that I can register?

In the mxGraphModel documentation [1], I can see the following, but I'm not sure what to call "getModel()" on for diagrams.net.

codevar enc = new mxCodec();

var node = enc.encode(graph.getModel());

model.addListener(mxEvent.CHANGE, function(sender, evt)...});

[1] mxGraphModel listener documentation https://jgraph.github.io/mxgraph/docs/js-api/files/model/mxGraphModel-js.html