Exported variable 'router' has or is using name 'Router' from external module but cannot be named

Question

In the common construct of defining nested routers in multiple files when exporting a router directly using Typescript 2 and the @types/[email protected] definition following code throws

error TS4023: Exported variable 'router' has or is using name 'Router' from external module 
         "[...]/node_modules/@types/express-serve-static-core/index" but cannot be named.

Example taken from basarat's answer

import * as express from "express";

// import sub-routers
import * as adminRouter from "./admin/admin";
import * as productRouter from "./products/products";

let router = express.Router();

// mount express paths, any addition middleware can be added as well.
// ex. router.use('/pathway', middleware_function, sub-router);

router.use('/products', productRouter);
router.use('/admin', adminRouter);

// Export the router
export = router;

Aides · Accepted Answer · 2017-01-25 09:03:25Z

14

The solution is to explicitly annotate the router variable (TypeScript/issues/5711#issuecomment-161194656).

Following code will work (note the let router: express.Router = express.Router())

import * as express from "express";

import * as adminRouter from "./admin/admin";
import * as productRouter from "./products/products";

let router: express.Router = express.Router();

router.use('/products', productRouter);
router.use('/admin', adminRouter);

// Export the router
export = router;

answered Jan 25, 2017 at 9:03

Aides

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1 Comment

Vikash Rathee Over a year ago

what you have in your productRouter, I just tried to import router from "../app" router.get("/", (req, res) => { res.send("Hello World!"); }); export = router; and it doesn't work

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