Using Express Mergeparams with TypeScript

user_17147145 0
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I'm using Typescript for my small project and I'm encountering a problem. I'm nesting my router but Typescript doesn't seem to recognize the parent's parameter.

On the "child" file I have

const childRouter = express.Router({ mergeParams: true });

childRouter.get('/', (req, res) => {
    const userName = req.params.username; 
    // This causes the error, Property 'username' does not exist on type '{}'
});

and then on the "parent" file the code is

import childRouter from './child';

const parentRouter = express.Router();

parentRouter.use('/:username', childRouter);

I have no idea how to fix this, it seems like typescript doesn't recognize that I'm using the parent's parameter. Any idea how to fix this?

typescript express
2 Answers

Edit: I misread the post the first time.

The request.params should be of following type if you installed the types properly for Express.

interface ParamsDictionary {
    [key: string]: string;
}

If you need to force type, you can also do following:

const username = req.params.username as string
user_94568760

Bit of a dirty solution:

childRouter.get('/', (req, res) => {
  const { username } = req.params as any;
  …
});
user_8937800
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