c8 incorrectly reports 100% coverage when using tsx

[nwalters512]

Acknowledgements

• I read the documentation and searched existing issues to avoid duplicates
• I am reporting a confirmed bug (not seek debugging help)
• I understand this is a collaborative project and relies on my contributions
• I read and understood the Contribution guide

Minimal reproduction URL

https://github.com/nwalters512/tsx-c8-coverage-repro

Problem & expected behavior (under 200 words)

I would expect c8's coverage reports to show something less than 100%, given that my "tests" in src/index.test.ts don't execute the subtract function from index.ts. However, they still report 100% coverage, and don't capture the fact that the code has multiple lines (this is the coverage shown by coverage/index.ts.html after running npm test in the reproduction):

I acknowledge that this issue is very similar to #433. However, it still reproduces on the latest version of tsx, so I felt it best to open a new issue. I based my reproduction on the one from that issue, but stripped it down to be as minimal as possible.

This is reproducible on Node 18, Node 20, and Node 22 (I tried all via nvm use ...).

Bugs are expected to be fixed by those affected by it

• I'm interested in working on this issue

Compensating engineering work financially will speed up resolution

• I'm willing to offer financial support

[nwalters512]

I might have opened this prematurely, sorry! I saw https://github.com/pvtnbr/tsx/pull/16 in the development repo, and the bot comment said it was available in 4.9.4-rc.1, so I assumed that the latest version (4.10.3) would contain those changes since it was after 4.9.4-rc.1. However, looking at the relevant line on master, it seems like this changes haven't made it back to this repo yet:

tsx/src/utils/transform/get-esbuild-options.ts

Line 24 in 05c382f

sourcesContent: false,

@privatenumber let me know if I just have to wait for this change to trickle down into an official build!

[privatenumber]

Just released it for ya in https://github.com/privatenumber/tsx/releases/tag/v4.10.4

I appreciate the sponsorship! Thanks @nwalters512