使用TypeScript开发小程序逻辑部分，使用了自定义命名空间，但是在app.ts中初始化时，总是找不到自定义的命名空间。微信小程序有没有使用TypeSript开发开发的面向对象开发demo？可以参考下目录结构和调用方式 itech.d.ts /// <reference path="./device/device.d.ts" /> /// <reference path="./device/device.api.d.ts" /> declare namespace Itech { interface DeviceManager { bindNewDevice(bindInfo: BindDeviceInfo): RemoteDevice | null; saveDeviceCacche(device: RemoteDevice): boolean; unbind(device: RemoteDevice): void; } interface getDeviceManager { () : DeviceManager; } } DeviceManager.ts文件 namespace Itech { export class DeviceManager { bindDevices: Map<string, RemoteDevice>; static INSTANCE: DeviceManager; static getInstance() : DeviceManager { if (DeviceManager.INSTANCE === undefined) { DeviceManager.INSTANCE = new DeviceManager(); } return DeviceManager.INSTANCE; } constructor() { this.bindDevices = new Map<string, RemoteDevice>(); } .... } 我要在app.ts中创建一个DeviceManager对象，调用其中的接口，要怎么初始化？ 使用如下调用 App<IAppOption>({ globalData: {}, onLaunch() { let deviceManager = Itech.DeviceManager.getInstance(); console.log("-----deviceManager: " + deviceManager); ... } 出错如下： thirdScriptError Itech is not defined;at App lifeCycleMethod onLaunch function ReferenceError: Itech is not defined     at he.onLaunch (http://127.0.0.1:51160/appservice/app.js:8:29)     at he.<anonymous> (http://127.0.0.1:51160/appservice/__dev__/WAService.js:1:1045736)     at http://127.0.0.1:51160/appservice/__dev__/WAService.js:1:1046174     at new he (http://127.0.0.1:51160/appservice/__dev__/WAService.js:1:1046250)     at Function.<anonymous> (http://127.0.0.1:51160/appservice/__dev__/WAService.js:1:1046581)     at http://127.0.0.1:51160/appservice/__dev__/WAService.js:1:1034791     at http://127.0.0.1:51160/appservice/app.js:3:1     at require (http://127.0.0.1:51160/appservice/__dev__/WAService.js:1:1077084)     at <anonymous>:1:1     at HTMLScriptElement.scriptLoaded (http://127.0.0.1:51160/appservice/appservice?t=1588058560389:3659:21)