fix: provide nodejs compat for dns methods wrapped with util.promisify

[antongolub]

What does this PR do?

Adds nodejs compatibility for dns[methods] wrapped with util.promisify

nodejs

> var u = require('util'), d = require('dns');
undefined
> await u.promisify(d.lookup)('examle.com')
{ address: '45.33.20.235', family: 4 }

bun

> var u = require('util'), d = require('dns')
undefined
> await u.promisify(d.lookup)('examle.com')
'45.33.20.235'

How did you verify your code works?

> var u = require('util'), d = require('dns')
undefined
> await u.promisify(d.lookup)('examle.com')
'45.33.20.235'
> d.lookup[u.promisify.custom] = d.promises.lookup
[Function: lookup]
> await u.promisify(d.lookup)('examle.com')
{ address: '45.33.20.235', family: 4 }

UPD

bun/build/bun-debug test js/node/dns

[Jarred-Sumner]

Thank you for this

One small nitpicky comment but lets merge after that

[Jarred-Sumner]

Instead of loading all of node:util, we can choose to instead load only the symbol we need:

Suggested change

	const util = require("node:util");
	const utilPromisifyCustomSymbol = Symbol.for("nodejs.util.promisify.custom")

[antongolub]

Hmm...
It turns out, there's a pair of symbols: nodejs.util.promisify.custom and util.promisify.custom

https://github.com/oven-sh/bun/blob/main/src/js/node/util.js#L150

[antongolub]

// TODO: register shared symbol promisify.custom — is it time?

[Jarred-Sumner]

Suggested change

	method[util.promisify.custom] = pMethod
	method[utilPromisifyCustomSymbol] = pMethod

[antongolub]

Finally, it works on my machine

✓ uses `dns.promises` implementations for `util.promisify` factory > resolvePtr
✓ uses `dns.promises` implementations for `util.promisify` factory > resolveSoa
✓ uses `dns.promises` implementations for `util.promisify` factory > resolveSrv
✓ uses `dns.promises` implementations for `util.promisify` factory > resolveTxt
✓ uses `dns.promises` implementations for `util.promisify` factory > resolveNaptr
[Loop] ref
[FilePoll] register: machport (9735)
[Loop] unref x 1
[FilePoll] machport
[FilePoll] onUpdate kevent (fd: 2147483646) GetAddrInfoRequest
[GetAddrInfoRequest] getAddrInfoAsyncCallback: status=0
[FilePoll] unregister: machport (2147483646) skipped due to needs_rearm
[Loop] ref
[FilePoll] register: machport (9739)
[Loop] unref x 1
[FilePoll] machport
[FilePoll] onUpdate kevent (fd: 2147483646) GetAddrInfoRequest
[GetAddrInfoRequest] getAddrInfoAsyncCallback: status=0
[FilePoll] unregister: machport (2147483646) skipped due to needs_rearm
✓ uses `dns.promises` implementations for `util.promisify` factory > util.promisify(dns.lookup) acts like dns.promises.lookup [4.13ms]

Some docs are referencing to make js, which seems useless. The required files are missing.

src/js/_codegen/index.ts
src/js/build-esm.ts

[Jarred-Sumner]

Thank you!