Export error codes

[fitiskin]

Handling #3842 and #4250.

Checklist

• run npm run test and npm run benchmark
• tests and/or benchmarks are included
• documentation is changed or added
• commit message and code follows the Developer's Certification of Origin
  and the Code of conduct

[mcollina]

Thanks for opening a PR! Can you please add a unit test?

[fitiskin]

@mcollina Can you please suggest what this unit test should check?

I see a lot of checks for error codes in current test cases like:

t.equal(err.code, 'FST_ERR_SCH_VALIDATION_BUILD')

I can update them to depend on exported errorCodes:

t.ok(err instanceof Fastify.errorCodes.FST_ERR_SCH_VALIDATION_BUILD)

if it makes sense.

I can add new tests but can't find a test case for them since it is just an export.

[fitiskin]

I see that not all error codes listed in the documentation. I could add missed ones, but it's hard to provide a meaningful description because I am not familiar with them.

[mcollina]

I see that not all error codes listed in the documentation. I could add missed ones, but it's hard to provide a meaningful description because I am not familiar with them.

Add them even with a minimum description!

[fitiskin]

Add them even with a minimum description!

Done :)

[mcollina]

lgtm

(something that would be amazing: automate the maintenance of the error codes).

[github-actions]

This pull request has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.