How to use the bootstrap/api/storage/pref-branch.PrefBranch function in bootstrap

  const prefBranchFactory = (branchRoot, namesToTypesMap) => new PrefBranch(
      Services.prefs, branchRoot, namesToTypesMap
  );

const {FileService} = require("bootstrap/api/services/file-service");
const {JSMService} = require("bootstrap/api/services/jsm-service");
const {XPConnectService} = require("bootstrap/api/services/xpconnect-service");
const {JsonStorage} = require("bootstrap/api/storage/json-storage");
const {PrefBranch} = require("bootstrap/api/storage/pref-branch");
const {Storage} = require("bootstrap/api/storage/storage.module");
const {SyncLocalStorageArea} = require("bootstrap/api/storage/sync-local-storage-area");
const {Log} = require("lib/classes/log");

const log = new Log();
const xpconnectService = new XPConnectService();
const jsmService = new JSMService(Cu);
const mozFileUtils = jsmService.getFileUtils();
const mozServices = jsmService.getServices();
const rpPrefBranch = new PrefBranch(
    Ci,
    mozServices.prefs,
    xpconnectService,
    "extensions.requestpolicy."
);
const fileService = new FileService(xpconnectService, mozFileUtils);
const jsonStorage = new JsonStorage(fileService);
const syncLocalStorageArea = new SyncLocalStorageArea(
    mozServices.prefs, rpPrefBranch, jsonStorage
);

function createStorageApi() {
  return new Storage(log, syncLocalStorageArea, rpPrefBranch);
}

//

function createPrivacyApi() {
  const xpconnectService = new XPConnectService();
  const rootPrefBranch = new PrefBranch(
      Ci,
      prefsService,
      xpconnectService,
      ""
  );
  const networkPredictionEnabled = new NetworkPredictionEnabledSetting(
      log, rootPrefBranch
  );
  const privacyApi = new PrivacyApi(log, networkPredictionEnabled);
  const privacy = privacyApi.backgroundApi;
  return {privacy, privacyApi, rootPrefBranch, networkPredictionEnabled};
}