feat: drop CJS build, node 18 & typescript < 5.5

[sxzz]

PR Checklist

• Addresses an existing open issue:
  • fixes 🛠 Tooling: Migrate to tsdown #761
  • fixes 🚀 Feature: Convert to pure ESM #764
  • fixes 📝 Documentation: Clarify supported TypeScript version range #712
• That issue was marked as status: accepting prs
• Steps in CONTRIBUTING.md were taken

Overview

tsup is not actively maintained anymore, migrating to new alternative tsdown.

[JoshuaKGoldberg]

💯 thanks!

[codecov]

Codecov Report

❌ Patch coverage is 83.33333% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 61.16%. Comparing base (181a947) to head (ea9aee9).
⚠️ Report is 2 commits behind head on v3.

Files with missing lines	Patch %	Lines
src/usage/UsageWalker.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##               v3     #760      +/-   ##
==========================================
- Coverage   61.46%   61.16%   -0.31%     
==========================================
  Files          35       35              
  Lines        2948     2987      +39     
  Branches      473      468       -5     
==========================================
+ Hits         1812     1827      +15     
- Misses       1136     1160      +24     

Flag	Coverage Δ
4.8.4	?
5.5.4	61.16% <83.33%> (?)
latest	61.16% <83.33%> (+0.44%)	⬆️

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[JoshuaKGoldberg]

Welp, there are build failures in Node.js 18. ts-api-utils still supports 18 in the current major. We haven't discussed plans to release a new one to breaking-change drop support for Node.js 18. Is this a blocker?

[sxzz]

This is because rolldown and tsdown do not support bundling in node 18, but his outputs will not be affected. Therefore, we need to find a way to test and run the outputs by tsdown in node18.

[JoshuaKGoldberg]

👍 if you can figure that out, great! I haven't looked deeply.

[sxzz]

I have refactored this PR to remove CJS support and Node.js 18 support. You can merge it when ready.

[JoshuaKGoldberg]

@RebeccaStevens I see this as still blocked on the v1.0.0 stuff since it ups the minimum Node.js version from 18 to 20?