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```/**
 * @NApiVersion 2.0
 * @NScriptType BundleInstallationScript
 */
define([], function () {
  function checkPrerequisites() {
    log.debug("all good, proceed with the uninstallation or update");
  }
  return {
    beforeUpdate: function beforeUpdate(params) {
      checkPrerequisites();
    },
  };
});```


The only thing that stands out is a named function after the beforeUpdate key.  Try just using `beforeUpdate: function(params) {`

make sure you named the bundle installation script file correctly