找不到“ zen-observable”的类型定义文件

Question

我正在使用Ionic 3，我只是选择了aws默认模板，但出现错误：

> ionic start app0 aws // aws is a default starting app in Ionic3 
> cd app0
> ionic serve

当我服务时：

错误：

[app-scripts] [16:44:12]  typescript: node_modules/aws-amplify/lib/PubSub/Providers/MqttOverWSProvider.d.ts, line: 2 
[app-scripts]             Cannot find type definition file for 'zen-observable'. 
[app-scripts]        L1:  import { Client } from 'paho-mqtt';
[app-scripts]        L2:  import * as Observable from 'zen-observable';
[app-scripts]        L3:  import { AbstractPubSubProvider } from './PubSubProvider';
[app-scripts] [16:44:12]  typescript: node_modules/aws-amplify/lib/PubSub/Providers/PubSubProvider.d.ts, line: 1 
[app-scripts]             Cannot find type definition file for 'zen-observable'. 
[app-scripts]        L1:  import * as Observable from 'zen-observable';
[app-scripts]        L2:  import { PubSubProvider, ProvidertOptions } from '../types';
[app-scripts]             Cannot find type definition file for 'zen-observable'. 
[app-scripts] [16:44:12]  typescript: node_modules/aws-amplify/lib/PubSub/PubSub.d.ts, line: 1 
[app-scripts]        L1:  import '../Common/Polyfills';       
[app-scripts]        L2:  import * as Observable from 'zen-observable';
[app-scripts] [16:44:12]  typescript: node_modules/aws-amplify/lib/PubSub/types/Provider.d.ts, line: 1 
[app-scripts]             Cannot find type definition file for 'zen-observable'. 
[app-scripts]        L1:  import * as Observable from 'zen-observable';
[app-scripts]        L2:  import { ProvidertOptions } from './PubSub';

离子信息：

  

离子：

     

ionic（Ionic CLI）：4.3.1

     

系统：

     

NodeJS：v8.9.4      npm：6.4.1      操作系统：Linux 4.13

Answer 1

尝试一下：

npm install –save-dev @types/zen-observable
npm install –save-dev @types/paho-mqtt