@types/express, @types/express-serve-static-core -- Basic server fails. 'Argument of type '"/api"' is not assignable to parameter of type 'RequestHandlerParams'.

[natejgardner]

• [x ] I tried using the @types/express and @types/express-serve-static-core package and had problems.
• I tried using the latest stable version of tsc. https://www.npmjs.com/package/typescript
• I have a question that is inappropriate for StackOverflow. (Please ask any appropriate questions there).
• Mention the authors (see Definitions by: in index.d.ts) so they can respond.
  • Authors: @borisyankov

Code:

import * as express from "express";
import { Request, Response } from "express";
import * as bodyParser from "body-parser";
import * as api from "./routes/api";

namespace my_api  {
    let app = express();
    let port: number = process.env.port || 3000;
    app.use(bodyParser.json());
    app.use('/api', api);
    app.get('/', (req: Request, res: Response) => {
           res.send("Hello world");
    });

    app.listen(port, () => console.log(`Express app listening on port ${port}`);
}

When building:

ERROR in /path/to/server.ts (25,11): Argument of type '"/api"' is not assignable to parameter of type 'RequestHandlerParams'.

Related:
expressjs/express#3263

[develucas]

hi @natejgardner
I encountered this error too and spent way too much time figuring this out. I tried fixing types definition by writing own d.ts. files but I failed. Then I came across this expressjs: typescript: Argument of type 'typeof <express.Router>' is not assignable to parameter of type 'RequestHandlerParams'
I see a lot of problems with TypeScript types and Expressjs and maybe this issue is serious but importing without using * seems to solve problem at least with calling overloaded use function.

[carmas123]

@natejgardner your problem is into the Api Router:

you can try a solution like this (into "./routes/api" file):

import { Router } from "express";
const router: Router = Router();
router.get("/", getInfo);
// ...other routes...
export = router;

It's work for me....enjoy :)

[danielpza]

Is this fixed ?

[orta]

Hi thread, we're moving DefinitelyTyped to use GitHub Discussions for conversations the @types modules in DefinitelyTyped.

To help with the transition, we're closing all issues which haven't had activity in the last 6 months, which includes this issue. If you think closing this issue is a mistake, please pop into the TypeScript Community Discord and mention the issue in the definitely-typed channel.

[orta]

Hi thread, we're moving DefinitelyTyped to use GitHub Discussions for conversations the @types modules in DefinitelyTyped.

To help with the transition, we're closing all issues which haven't had activity in the last 6 months, which includes this issue. If you think closing this issue is a mistake, please pop into the TypeScript Community Discord and mention the issue in the definitely-typed channel.