code: function updateManifestWithPublisher (config, myBuildTargets) {
      if (!config.publisherId) return;
  
      var manifestFiles = myBuildTargets.map(function (proj) {
          return projFilesToManifests[proj];
      });
      manifestFiles.forEach(function (file) {
          var manifest = AppxManifest.get(path.join(ROOT, file));
          manifest.getIdentity().setPublisher(config.publisherId);
          manifest.write();
      });
  }
docs: Note: This function is very narrow and only writes to the app manifest if an update is done.  See CB-9450 for the reasoning of why this is the case.