fix: respect the map option and source maps

[alexander-akait]

This PR contains a:

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

Motivation / Use-Case

respect source map and map option

Breaking Changes

No

Additional Info

No

[codecov]

Codecov Report

Merging #458 into master will increase coverage by 0.06%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #458      +/-   ##
==========================================
+ Coverage   96.49%   96.55%   +0.06%     
==========================================
  Files           5        5              
  Lines         228      232       +4     
  Branches       61       63       +2     
==========================================
+ Hits          220      224       +4     
  Misses          8        8              

Impacted Files	Coverage Δ
src/index.js	100.00% <100.00%> (ø)

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