Extend Request Type in NestJS

When using a NestJS app on SAP Cloud Platform (Cloud Foundry) with the UAA service, details of the logged in user are available at req.user (where req is the request object from Express).

However, since the type definition of Request does not have a user property, the TypeScript compiler doesn't allow us to access it.

To extend the type definition, create a file at @types/express/index.d.ts from the root directory of the NestJS app and add this to the file:

declare namespace Express {
  interface Request {
    user: any;

This can be used to extend any types declared by libraries.