httpErrors.HttpError type export should be a class, not an interface

[tmcw]

Prerequisites

• [X] I have written a descriptive issue title
• [X] I have searched existing issues to ensure the bug has not already been reported

Fastify version

4.28.1

Plugin version

5.6.0

Node.js version

v20.16.0

Operating system

macOS

Operating system version (i.e. 20.04, 11.3, 10)

14.6.1 (23G93)

Description

This module exports a class at httpErrors.HttpError, so I should be able to write an errorHandler in fastify like this:

    errorHandler(error, _request, reply) {
      if (error instanceof httpErrors.HttpError) {
        return error;
      }
      return reply.internalServerError();
    }

However, this doesn't type-check: httpErrors.HttpError is an interface in the type exports:

https://github.com/fastify/fastify-sensible/blob/822ae7a895e7e8296429ea38e2cf4060aaf19144/lib/httpError.d.ts#L1-L9

And you can't instanceof an interface, because it's a type, not a value. Most likely, HttpError should be a class.

Link to code that reproduces the bug

No response

Expected Behavior

No response

[Uzlopak]

Can you provide a PR?

[tmcw]

Yep, I'm trying to, it's turning out to be tricky to implement.