swc: Support paths from tsconfig

[spmiller]

The swc transpiler can support paths, but they have to be converted to absolute paths using the baseUrl first.

[spmiller]

Hi maintainers, some more context in case it's not clear: tsconfig.json supports paths, but this wasn't wired into the ts-node swc transpiler. I wired this in using absolute paths (as recommended here)

[spmiller]

Hi @cspotcode, I see you're also working on swc support in #1802. Assuming you see the value in this PR, how do think it should progress? I'm happy to help out if you would like it to go in as part of #1802.

[erfanium]

@spmiller
I came across this today. but here's a thing. we should not add a feature that is only available on swc.
I think this feature is not supported by TypeScript official transpiler.

[spmiller]

Hi @erfanium, thanks for looking at this patch.

The paths attribute is indeed supported by tsc (I linked to the config above) but ts-node wasn't passing this part of the config through to the swc compiler. Because of this, I don't think it's only available on swc, but perhaps I have misunderstood your point?

[erfanium]

@spmiller
I have made a tiny repo for you:
https://github.com/erfanium/esm-ts-paths

in tsconfig file, either using swc: true to swc: false doesn't make it work. that means this feature is not supported by tsc even.

or maybe i am wrong