fix: source map generation with pathinfo

[alexander-akait]

This PR contains a:

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

Motivation / Use-Case

fix #814

Breaking Changes

No

Additional Info

Fix source map generation with pathinfo

[codecov]

Codecov Report

Merging #817 (7771697) into master (c6c18a6) will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #817      +/-   ##
==========================================
+ Coverage   92.12%   92.16%   +0.04%     
==========================================
  Files           6        6              
  Lines         711      715       +4     
  Branches      171      173       +2     
==========================================
+ Hits          655      659       +4     
  Misses         53       53              
  Partials        3        3              

Impacted Files	Coverage Δ
src/index.js	95.58% <100.00%> (+0.04%)	⬆️

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