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Multi tool use

I'd like to use express-boom for express with TypeScript. It lacks of typings so I'd like to write my own. Just make it compile is trivial.

This middleware decorates the res object with a property boom (derived from the boom module):

But with typescript I need to cast it because neither http.ServerResponse and Express.Response have the boom property, of course:

Which is the cleanest way to do it? Which are other typed middleware that are doing a similar thing?

There's quite a few other Express middlewares you can use as examples, e.g. Method-Override, and its type definitions.

As a more concrete example, if you want to add this .boom property to the response object, you should just need to create a type definition (express-boom.d.ts) containing:

Create a type definition file express-boom.d.ts containing:

This declares that the interface Express.Response has an additional property named boom. The declared type of the property is the same as that of the namespace Boom, meaning that the property is an object that has all the same methods as the Boom namespace.

Here is a sample usage. Hope this helps someone.

Include express-boom.d.ts along with your applications source files.

Refer the sample-usage.ts in the below gist for example usage:

Gist: Type definitions for express-boom:

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