chore: optimize a few files for perf/size and add more typings

[ghiscoding]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.0%. Comparing base (9af6d56) to head (5f752da).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #148   +/-   ##
=======================================
  Coverage   100.0%   100.0%           
=======================================
  Files          25       25           
  Lines        1378     1369    -9     
  Branches      117      122    +5     
=======================================
- Hits         1378     1369    -9     

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