proxyGetSet.js

static createProxyFromModel(model) {
  return new Proxy(model, {
    get: function(target, name) {
      if (name in model.definition) {
        return model.get(name);
      } else {
        return target[name];
      }
    },
    set: function(target, name, value) {
      if (name in model.definition) {
        model.set(name, value);
      } else {
        target[name] = value;
      }
    }
  });
}