TPromsterOptions not allowing for default options

[roikoren755]

Describe the bug
I'm trying to create a middleware for an express app, using @promster/express' createMiddleware function. Before the package moved to TS, the following worked

createMiddleware({ options: { metricTypes: ['countOfGcs', 'durationOfGc', 'reclaimedInGc'] } });

and gave me the metrics I wanted. Now, however, after the move, I get an error from TS stating that buckets and percentiles are missing.

To Reproduce
Steps to reproduce the behavior:

Using TS 3.9, the following shows the error

import { createMiddleware } from '@promster/express';

createMiddleware({ options: { metricTypes: ['countOfGcs', 'durationOfGc', 'reclaimedInGc'] } });

Expected behavior
No TypeScript errors should occur

Additional context
Any place I found in the source code that uses either of these values has a fallback default value, so shouldn't these two be optional?

Right now, TPromsterOptions is defined with

    buckets: [number];
    percentiles: [number];
}

From what I saw, these can be optional in the interface. I can open a PR with this small change, if that would be deemed appropriate, and would help

[tdeekens]

Thanks for opening such a eloborate issue!

I think what you're suggesting sounds right. Can you open a PR to fix it then we can take the discussion there.

[roikoren755]

Opened a PR at #379