Bring in the type "Request" from the express-request-id module

Question

Bring in the type "Request" from the express-request-id module

Within our web app that utilizes TypeScript and express, we integrated the npm package express-request-id to enhance our HTTP Requests and responses by adding X-Request-Id headers.

We crafted a middleware to assign the request's id to the HTTP response header in the following manner:

import type { Request, NextFunction, RequestHandler, Response } from 'express'
//...
export const requestIdHandler = (_fn: RequestHandler) => (req: Request, res: Response, _next: NextFunction) => {
    res.set('X-Request-Id', req.id)
}

Expectedly, this does not integrate seamlessly due to the fact that the id property is lacking in the express-defined type. Upon discovery, we observed that the types.d.ts file in express-request-id supersedes the type definition of the Request type established by express, yet we encountered difficulties importing that type. What would be the proper approach to import the overridden type?

typescript express types

Answer 1

Answer №1

Discovered the solution in a helpful article on customizing Express request types: by creating a declaration file called src/types/express/index.d.ts and adding the following snippet:

// src/types/express/index.d.ts

// Make it a module to avoid TypeScript error
export {}

declare global {
  namespace Express {
    export interface Request {
      id?: string;
    }
  }
}

This technique utilizes TypeScript's powerful declaration merging feature to combine the declarations seamlessly.

Answer 2

Discovered the solution in a helpful article on customizing Express request types: by creating a declaration file called src/types/express/index.d.ts and adding the following snippet:

// src/types/express/index.d.ts

// Make it a module to avoid TypeScript error
export {}

declare global {
  namespace Express {
    export interface Request {
      id?: string;
    }
  }
}

This technique utilizes TypeScript's powerful declaration merging feature to combine the declarations seamlessly.

Bring in the type "Request" from the express-request-id module

Answer №1

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