WIP refactor: make constructors as functions to reduce bundle size

[yusukebe]

The author should do the following, if applicable

• Add tests
• Run tests
• bun run format:fix && bun run lint:fix to format the code
• Add TSDoc/JSDoc to document the code

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.71%. Comparing base (bfc190f) to head (f98b1eb).

Additional details and impacted files

@@           Coverage Diff            @@
##             main    #3666    +/-   ##
========================================
  Coverage   91.70%   91.71%            
========================================
  Files         159      160     +1     
  Lines       10159    10171    +12     
  Branches     2977     2853   -124     
========================================
+ Hits         9316     9328    +12     
  Misses        842      842            
  Partials        1        1            

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🚨 Try these New Features:

• Flaky Tests Detection - Detect and resolve failed and flaky tests
• JS Bundle Analysis - Avoid shipping oversized bundles

[EdamAme-x]

it works well.

[github-actions]

Bundle size check

	main (bfc190f)	#3666 (831f1ba)	+/-
Bundle Size (B)	18,835B	18,756B	-79B
Bundle Size (KB)	18.39K	18.32K	-0.07K

Compiler Diagnostics

	main (bfc190f)	#3666 (831f1ba)	+/-
Files	256	257	1
Lines	115,030	115,046	16
Identifiers	111,963	111,996	33
Symbols	243,452	243,475	23
Types	204,686	204,689	3
Instantiations	3,044,030	3,044,030	0
Memory used	420,634K	428,708K	8,074K
I/O read	0.02s	0.03s	0.01s
I/O write	0s	0s	0s
Parse time	0.74s	0.77s	0.03s
Bind time	0.27s	0.34s	0.07s
Check time	5.91s	5.62s	-0.29s
Emit time	0s	0s	0s
Total time	6.93s	6.73s	-0.2s

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Reported by octocov