chore: rewrite to TS again

[phaux]

Node can now run TS files. Should not have breaking changes.

[codecov]

Codecov Report

❌ Patch coverage is 98.98990% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 96.14%. Comparing base (ef10e9d) to head (8390d69).
⚠️ Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
lib/index.ts	98.98%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #159      +/-   ##
==========================================
- Coverage   97.50%   96.14%   -1.37%     
==========================================
  Files           1        1              
  Lines         522      467      -55     
  Branches        0       26      +26     
==========================================
- Hits          509      449      -60     
- Misses         13       18       +5     

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.