Registering automapper-ts in Global Context not working - Angular App Reference undefined

After updating to Angular 18 the node package automapper-ts is no longer working.

When trying to register Automapper in global context, app is undefined, thus the Reference to the Angular App cannot be resolved. Anyone the same prob?

automapper.js

var automapper = (function (app) {
app.automapper = AutoMapperJs.AutoMapper.getInstance(); <--- ERROR
return app.automapper;
})(this);

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