feat: fork cross-spawn to fix esbuild chaos

[43081j]

esbuild isn't great at bundling for node. it currently produces invalid code by leaving require calls in the esm output, which is far from great.

To resolve this, this moves cross-spawn into the repo and converts it to ESM while dropping any logic we weren't making use of.

DRAFT until i finish adding the tests for the cross-spawn module.

This may also be discarded if we find a simpler way to get esbuild to output valid code.

cc @bluwy

[Uzlopak]

Whats that?

[43081j]

the license of cross-spawn. any usage of the original code needs to maintain the copyright

[benmccann]

I feel like the better solution to this would be to switch from tsup to rollup

[43081j]

are we sure rollup doesn't have the same problem? under the hood, esbuild is at fault here. it just doesn't transform require() calls of built in modules. so the output has CJS in it still and definitely shouldn't

would be curious if rollup just does the same, i feel like someone pointed me at an issue in their github that suggested it does 👀

[benmccann]

I know that rollup doesn't have this issue because we just tried to migrate a repo from rollup to rolldown and ran into an issue where the require was no longer being transformed (rolldown/rolldown#2041)

[bluwy]

I tried rollup locally when we discussed this issue and it didn't have the same problem IIRC, which i thought it would have, so using rollup would definitely be an option, but it requires more setup.

[benmccann]

I sent a PR for rollup here: #35

[gameroman]

Since it is using tsdown now and there is also #100 open this can be closed now probably

[43081j]

we still need to get rid of cross spawn eventually but this PR is unlikely to be the one, so will close.