How to use the fs-jetpack.cwd function in fs-jetpack

export async function listBuiltinFavicons ({filter, offset, limit} = {}) {
  if (filter) {
    filter = new RegExp(filter, 'i')
  }

  // list files in assets/favicons and filter on the name
  var dir = jetpack.cwd(__dirname).cwd('assets/favicons')
  var items = (await dir.listAsync())
    .filter(filename => {
      if (filter && !filter.test(filename)) {
        return false
      }
      return filename.endsWith('.ico')
    })
  return items.slice(offset || 0, limit || Number.POSITIVE_INFINITY)
}

'use strict';

var gulp = require('gulp');
var watch = require('gulp-watch');
var batch = require('gulp-batch');
var ts = require('gulp-typescript');
var plumber = require('gulp-plumber');
var jetpack = require('fs-jetpack');
var bundle = require('./bundle');
var utils = require('./utils');
// var ts = require('typescript');

var projectDir = jetpack;
var srcDir = jetpack.cwd('./src');
var distDir = jetpack.cwd('./dist');
var destDir = jetpack.cwd('./app');

gulp.task('bundle', function() {
  return Promise.all([
    bundle(distDir.path('background', 'parser.js'), destDir.path('parser.js')),
    bundle(distDir.path('background', 'app.js'), destDir.path('background.js')),
    bundle(distDir.path('ui', 'app.js'), destDir.path('app.js'))
  ]);
});

var tsProject = ts.createProject('tsconfig.json');

gulp.task('ts', function() {
  var tsResult = gulp.src('src/**/*.ts').pipe(tsProject());

  return tsResult.js.pipe(gulp.dest('dist'));
});

*            the electron project directory LICENSE file.
 *
 * @fileoverview Electron entry point continues here. Creates windows and
 *               handles system events.
 */
const electron = require('electron');
const app = electron.app;
const BrowserWindow = electron.BrowserWindow;

const appMenu = require('./appmenu.js');
const server = require('./servermgr.js');
const projectLocator = require('./projectlocator.js');
const createWindow = require('./helpers/window');

const winston = require('winston');
const packageData = require('fs-jetpack').cwd(app.getAppPath()).read('package.json', 'json');

const tag = '[ArdublocklyElec] ';

// Global reference of the window object must be maintain, or the window will
// be closed automatically when the JavaScript object is garbage collected.
var mainWindow = null;
var splashWindow = null;

// Set up the app data directory within the Ardublockly root directory
(function setAppData() {
    var appDataPath = projectLocator.getExecDirJetpack().cwd('appdata');
    app.setPath('appData', appDataPath.path());
    app.setPath('userData', appDataPath.path());
    app.setPath('cache', appDataPath.path('GenCache'));
    app.setPath('userCache', appDataPath.path('AppCache'));
    app.setPath('temp', appDataPath.path('temp'));

// Spec files are scattered through the whole project. Here we're searching
// for them and generate one entry file which will run all the tests.

'use strict'

const jetpack = require('fs-jetpack')
const srcDir = jetpack.cwd('src')

const fileName = 'spec.js.autogenerated'
const fileBanner = '// This file is generated automatically.\n' +
      "// All your modifications to it will be lost (so don't do it).\n"
const whatToInclude = [
  '*.spec.js',
  '!node_modules/**'
]

module.exports = function () {
  return srcDir.findAsync('.', { matching: whatToInclude }, 'relativePath')
        .then(function (specPaths) {
          let fileContent = specPaths.map(function (path) {
            return 'import "' + path + '";'
          }).join('\n')
          return srcDir.writeAsync(fileName, fileBanner + fileContent)

// Imports

import os from 'os';
import request from 'superagent';
import {
    remote,
    ipcRenderer
} from 'electron';
import jetpack from 'fs-jetpack';
import env from './env';

// Globals
var app = remote.app;
var ipc = ipcRenderer;
var shell = remote.shell;
var appDir = jetpack.cwd(app.getAppPath());

// App
(function ($) {

    'use strict';

    var App = function () {

        var timeout;
        var flatline = false;

        var $save = $('#save');
        var $model = $(".model");
        var $url = $("#url__value");
        var $reset = $("#reset-settings");
        var $go_offline = $('#go-offline');

gulp.task('build-unit', gulp.parallel('environment', function () {
    var srcDir = jetpack.cwd('src');
    var destDir = jetpack.cwd('app');

    return generateEntryFile(srcDir, 'specs.js.autogenerated', '*.spec.js')
    .then(function (entryFilePath) {
        return bundle(entryFilePath, destDir.path('specs.js.autogenerated'), {
            rollupPlugins: [
                istanbul({
                    exclude: ['**/*.spec.js', '**/specs.js.autogenerated'],
                    sourceMap: true
                })
            ]
        });
    });
}));

export async function getBuiltinFavicon (name) {
  var dir = jetpack.cwd(__dirname).cwd('assets/favicons')
  return dir.readAsync(name, 'buffer')
}

'use strict';

var gulp = require('gulp');
var less = require('gulp-less');
var watch = require('gulp-watch');
var batch = require('gulp-batch');
var plumber = require('gulp-plumber');
var jetpack = require('fs-jetpack');
var bundle = require('./bundle');
var utils = require('./utils');

var projectDir = jetpack;
var srcDir = jetpack.cwd('./src');
var destDir = jetpack.cwd('./app');

gulp.task('bundle', function () {
    return Promise.all([
        bundle(srcDir.path('background.js'), destDir.path('background.js')),
        bundle(srcDir.path('app.js'), destDir.path('app.js')),
        bundle(srcDir.path('karma.js'), destDir.path('karma.js')),
    ]);
});

gulp.task('less', function () {
    return gulp.src(srcDir.path('stylesheets/main.less'))
        .pipe(plumber())
        .pipe(less())
        .pipe(gulp.dest(destDir.path('stylesheets')));
});

function createWindow () {
  /**
   * If there is already data in old directory. Moved it to new
   */
  const oldDirectory = jetpack.cwd(app.getPath('userData'))
  const newDirectory = jetpack.cwd(app.getPath('home'))
  const existsArticle = jetpack.exists(oldDirectory.path('articles.db'))
  const existsFeed = jetpack.exists(oldDirectory.path('feeds.db'))
  const winURL = process.env.NODE_ENV === 'development' ? 'http://localhost:9080' : `file://${__dirname}/index.html`

  if (existsArticle && existsFeed) {
    jetpack.move(oldDirectory.path('feeds.db'), newDirectory.path('.rss-reader/feeds.db'))
    jetpack.move(oldDirectory.path('articles.db'), newDirectory.path('.rss-reader/articles.db'))
  }
  /**
   * Initial window options
   */
  mainWindow = new BrowserWindow({
    webPreferences: {
      webviewTag: true,
      nodeIntegration: true,