This adds [Node's `util.callbackify`][0] to `std/node/util.ts`.
I lifted most of this from the [original Node source code][1] (and [its
tests][2]). I tried to make minimal modifications to the source.
I made a few arbitrary decisions:
- I was unable to do the function's types elegantly. I made overloads
for functions that have 0 to 5 (inclusive) arguments, excluding the
callback. I would love to know a better way to do this. (It seems that
the folks at DefinitelyTyped [were also stumped][3], though maybe
their solution is deliberate.)
- There are a few edge cases that cause custom Node errors to be
produced. Instead of re-implementing those errors completely, I
created simplified classes. These are mostly correct but are not
identical to the real Node errors.
- The tests implement a possibly-arcane `TestQueue` class. I originally
used a lot of inline promises but found it too repetitive.
Closes [#5366][4].
[0]: https://nodejs.org/api/util.html#util_util_callbackify_original
[1]: 4780493301/lib/util.js (L183-L226)
[2]: 4780493301/test/parallel/test-util-callbackify.js
[3]: 7d24857ddb/types/node/util.d.ts (L61-L84)
[4]: https://github.com/denoland/deno/issues/5366
