refactor: code

[alexander-akait]

This PR contains a:

• bugfix
• new feature
• code refactor
• test update
• typo fix
• metadata update

Motivation / Use-Case

Just refactor

Breaking Changes

No

Additional Info

No

[codecov]

Codecov Report

Merging #305 into master will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #305      +/-   ##
==========================================
+ Coverage   97.78%   97.79%   +0.01%     
==========================================
  Files           7        7              
  Lines         406      408       +2     
  Branches      108      104       -4     
==========================================
+ Hits          397      399       +2     
  Misses          9        9              

Impacted Files	Coverage Δ
src/index.js	100.00% <100.00%> (ø)
src/plugins/minimizer-plugin.js	100.00% <100.00%> (ø)
src/plugins/source-plugin.js	94.91% <100.00%> (-0.98%)	⬇️
src/utils.js	99.54% <100.00%> (+0.09%)	⬆️

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