"Facing an issue where ts-node is not recognizing d.ts files, despite tsc being able to compile them

Question

"Facing an issue where ts-node is not recognizing d.ts files, despite tsc being able to compile them

I am currently using typescript along with express and attempting to enhance the request object in express.

Below is my server.ts file:

import express, { Request, Response } from "express";
const app = express();
app.use(function(req: Request, res: Response, next) {
    req.customProperty = 200;
});

And here is my extends.d.ts file:

declare namespace Express {
    export interface Request {
        customProperty: number;
    }
}

While developing, I am utilizing VSCode. The IDE does not show any warnings.

Compiling the code using tsc also works without any issues.

However, when running the code using ts-node, an error message is encountered:

src/server.ts:19:9 - error TS2339: Property 'customProperty' does not exist on type 'Request<ParamsDictionary>'.

19     req.customProperty = 200;
           ~~~~~~~~~~~

typescript express

Answer 1

Answer №1

During the course of one of my projects, a similar situation occurred. To solve it, I decided to include the --files flag when running ts-node:

ts-node --files server.ts

For more information, you can refer to the documentation, which mentions:

If you need to use files, include, or exclude, make sure to enable the --files flag or set TS_NODE_FILES=true

Answer 2

During the course of one of my projects, a similar situation occurred. To solve it, I decided to include the --files flag when running ts-node:

ts-node --files server.ts

For more information, you can refer to the documentation, which mentions:

If you need to use files, include, or exclude, make sure to enable the --files flag or set TS_NODE_FILES=true

Answer 3

Answer №2

To define the variable testVal, you can utilize the following code snippets:

Method 1:

declare global {
  namespace Express {
    interface Request {
      testVal : number
    }
  }
}

Method 2:

declare module 'express' {
  interface Request {
    testVal : number
  }
}

I trust that this will work as expected.

Answer 4

To define the variable testVal, you can utilize the following code snippets:

Method 1:

declare global {
  namespace Express {
    interface Request {
      testVal : number
    }
  }
}

Method 2:

declare module 'express' {
  interface Request {
    testVal : number
  }
}

I trust that this will work as expected.

"Facing an issue where ts-node is not recognizing d.ts files, despite tsc being able to compile them

Answer №1

Answer №2

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