refactor: code

[alexander-akait]

This PR contains a:

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

Motivation / Use-Case

for future #954

Breaking Changes

No

Additional Info

No

[codecov]

Codecov Report

Merging #1003 into master will increase coverage by 0.91%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master   #1003      +/-   ##
=========================================
+ Coverage   98.38%   99.3%   +0.91%     
=========================================
  Files          10      10              
  Lines         434     431       -3     
  Branches      131     136       +5     
=========================================
+ Hits          427     428       +1     
+ Misses          7       3       -4

Impacted Files	Coverage Δ
src/plugins/postcss-import-parser.js	100% <ø> (+2.32%)	⬆️
src/plugins/postcss-url-parser.js	98.64% <100%> (+1.14%)	⬆️
src/index.js	100% <100%> (+2.12%)	⬆️
src/utils.js	99.36% <100%> (-0.02%)	⬇️
src/plugins/postcss-icss-parser.js	100% <100%> (+3.7%)	⬆️

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