infra: migrate to tsdown

[Shinigami92]

tsup got a rewrite in Rust using VoidZero rolldown named tsdown

this PR migrates from tsup to tsdown

performance for a build run on my windows PC is pnpm run build from 11s-12s to 7s

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GitHub Actions CI

• old: https://github.com/faker-js/faker/actions/runs/16079228062/job/45380861987#step:6:1 (8s build)
• new: https://github.com/faker-js/faker/actions/runs/16079748534/job/45382277876?pr=3558#step:6:1 (5s build)

tsdown size is also a bit smaller than tsup

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.97%. Comparing base (82f2b9d) to head (18a3919).

Additional details and impacted files

@@           Coverage Diff           @@
##             next    #3558   +/-   ##
=======================================
  Coverage   99.97%   99.97%           
=======================================
  Files        2995     2995           
  Lines      236324   236324           
  Branches      941      939    -2     
=======================================
  Hits       236267   236267           
  Misses         57       57           

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[xDivisionByZerox]

I'll need to verify that this build works as expected using the playground. Might take some time, as it doesn't have any priority for me right now.

[Shinigami92]

I'll need to verify that this build works as expected using the playground. Might take some time, as it doesn't have any priority for me right now.

Sure, take your time. This is not a breaking change and can theoretically merged any time.

I use it already in unuse and here I checked it in the preview docs console.

[Copilot]

Pull Request Overview

This PR migrates the build toolchain from tsup to tsdown, a Rust-based rewrite of tsup using VoidZero rolldown. The migration aims to improve build performance (from 11-12s to 7s locally, 8s to 5s in CI) while maintaining equivalent functionality.

• Replaces tsup configuration with tsdown configuration using simplified entry patterns
• Updates package.json scripts and dependencies to use tsdown instead of tsup
• Cleans up package.json exports structure by removing redundant nested "default" objects

Reviewed Changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated 2 comments.

File	Description
tsup.config.ts	Removes the existing tsup configuration file
tsdown.config.ts	Adds new tsdown configuration with simplified glob patterns and publint integration
package.json	Updates build scripts, dependencies, and cleans up exports structure

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported

[xDivisionByZerox]

It took some time - sorry about that.

Multiple things:

• the PR needs a rebase or merge of the next branch
• while testing I saw that tsdown has new versions, maybe we want to directly migrate to those
• tsdown hashes all files, including the "dist/index.js" and the "dist/index.d.ts" file. Because of that, the exports defined in the package.json do not work (ERROR pkg.exports["."].types is ./dist/index.d.ts but the file does not exist.) - this needs to be addressed

@Shinigami92 are you up to the task?

[Shinigami92]

Yes, can look into that.
However right now I can't reach my PC, and my laptop reached 0% battery 🫣 and the power cable isn't strong enough 🥲

[Shinigami92]

@xDivisionByZerox updated everything

tsdown hashes all files, including the "dist/index.js" and the "dist/index.d.ts" file. Because of that, the exports defined in the package.json do not work (ERROR pkg.exports["."].types is ./dist/index.d.ts but the file does not exist.) - this needs to be addressed

I'm not sure if you e.g. forget to clean something or not, however, tsdown is checking the exports field with publint and on my machine everything looks fine 🤔

[xDivisionByZerox]

I'm not sure if you e.g. forget to clean something or not, however, tsdown is checking the exports field with publint and on my machine everything looks fine 🤔

You are right. I honestly can't tell you what the problem was (invalid dependency cache, legacy artifacts or whatever) - i can now get the project to build on my machine as well.

I'm running into the next problem, tho. I cannot get the CJS (Jest) playground to run probably with a locally linked dependency. You might want to give it a try, because I'm currently at my limit with this jest configuration nonsense...