define([], function () { 'use strict'; return { fileExists: function (path) { if (window.NativeShell && window.NativeShell.FileSystem) { return window.NativeShell.FileSystem.fileExists(path); } return Promise.reject(); }, directoryExists: function (path) { if (window.NativeShell && window.NativeShell.FileSystem) { return window.NativeShell.FileSystem.directoryExists(path); } return Promise.reject(); } }; });