将 Express() 与 TypeScript 结合使用
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Using Express() with TypeScript
提问by Zoltan Arvai
I want to use the most recent version of Expess with node.js in TypeScript. The express.d.ts provided by microsoft in the samples seems to be built upon a versions prior to 3.0.x. In previous version you could do
我想在 TypeScript 中使用带有 node.js 的最新版本的 Expess。微软在示例中提供的 express.d.ts 似乎是基于 3.0.x 之前的版本构建的。在以前的版本中，您可以这样做
var app = express.createServer()
but after 3.0.x you should do:
但在 3.0.x 之后你应该这样做：
var app = express();
Express.d.ts does not support this... I've found a hack around this: I've added the following line to Express.d.ts:
Express.d.ts 不支持这个......我发现了一个解决这个问题的技巧：我在 Express.d.ts 中添加了以下行：
export function(): any;
In app.tswhen I want to create the app object I do the following:
在app.ts当我要创建应用程序对象我做到以下几点：
var app = <express.ExpressServer>express();
This seems to fix the issue, it's compiling without an error, and also I get intellisense support. However this is a hack... First of all why can't I write something like this?
这似乎解决了这个问题，它编译没有错误，而且我得到了智能感知支持。然而这是一个黑客......首先为什么我不能写这样的东西？
export function(): ExpressServer;
Is this the recommended way to fix this issue?
这是解决此问题的推荐方法吗？
回答by Wade Hatler
Pretty old discussion, but I ran into the same problem recently and found that there is a new express.d.tsthat properly supports express 3 on the DefinitelyTypedsite.
很老的讨论，但我最近遇到了同样的问题，发现express.d.ts在绝对类型站点上有一个正确支持 express 3的新问题。
回答by joshuapoehls
You should be able to add this ambient function declaration to express.d.tsto get what you want.
您应该能够添加此环境函数声明express.d.ts以获得您想要的。
declare function express(): ExpressServer;
declare function express(): ExpressServer;
回答by MajidJafari
if you declare expressthis way: import * as express from "express", you will get this error in runtime, declaring it this way: const express = require "express", won't throw any error.
如果你这样声明express: import * as express from "express"，你会在运行时得到这个错误，这样声明它: const express = require "express"，不会抛出任何错误。
Also, don't forget to declare appvariable or property type as express.Application
另外，不要忘记将app变量或属性类型声明为express.Application
回答by czechboy
Here's a sample project - Express 4.x app in TypeScript: https://github.com/czechboy0/Express-4x-Typescript-Sample
这是一个示例项目 - TypeScript 中的 Express 4.x 应用程序：https: //github.com/czechboy0/Express-4x-Typescript-Sample
