fix: types

[alexander-akait]

This PR contains a:

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

Motivation / Use-Case

fix and improve types

Breaking Changes

No

Additional Info

No

[codecov]

Codecov Report

Merging #457 (5e00646) into master (f84a149) will increase coverage by 0.64%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #457      +/-   ##
==========================================
+ Coverage   96.39%   97.03%   +0.64%     
==========================================
  Files           4        4              
  Lines         305      304       -1     
  Branches      114      114              
==========================================
+ Hits          294      295       +1     
+ Misses         11        9       -2     

Impacted Files	Coverage Δ
src/utils.js	94.87% <ø> (ø)
src/index.js	97.24% <100.00%> (+0.77%)	⬆️

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