refactor: Updated lib/shim/shim.js to remove cognitive complexity violations

[bizob2828]

Description

• Fixed most jsdoc violations
• Refactored shim but reducing cognitive complexity. This was done by removing nested functions

Related Issues

Closes NR-134577

[codecov]

Codecov Report

Attention: 6 lines in your changes are missing coverage. Please review.

Comparison is base (04fee88) 97.02% compared to head (c5bcaef) 97.03%.

Files	Patch %	Lines
lib/shim/shim.js	98.30%	6 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##             main    #1950    +/-   ##
========================================
  Coverage   97.02%   97.03%            
========================================
  Files         215      215            
  Lines       40258    40372   +114     
========================================
+ Hits        39062    39176   +114     
  Misses       1196     1196            

Flag	Coverage Δ
integration-tests-16.x	78.89% <64.97%> (+0.01%)	⬆️
integration-tests-18.x	79.15% <64.97%> (+0.02%)	⬆️
integration-tests-20.x	79.16% <64.97%> (+<0.01%)	⬆️
unit-tests-16.x	91.12% <97.74%> (+0.02%)	⬆️
unit-tests-18.x	91.11% <97.74%> (+0.02%)	⬆️
unit-tests-20.x	91.11% <97.74%> (+0.02%)	⬆️
versioned-tests-16.x	74.00% <91.80%> (+0.04%)	⬆️
versioned-tests-18.x	74.02% <91.80%> (+0.04%)	⬆️
versioned-tests-20.x	74.03% <91.80%> (+0.04%)	⬆️

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