feat: added types

[alexander-akait]

This PR contains a:

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

Motivation / Use-Case

Added types

Breaking Changes

No

Additional Info

Yes, we had bugs with some very edge cases, I fixed them, also added todo for other edge cases

[codecov]

Codecov Report

Merging #650 (3aff348) into master (f8aad69) will decrease coverage by 2.88%.
The diff coverage is 90.00%.

@@            Coverage Diff             @@
##           master     #650      +/-   ##
==========================================
- Coverage   92.83%   89.94%   -2.89%     
==========================================
  Files           3        3              
  Lines         377      388      +11     
  Branches      109      119      +10     
==========================================
- Hits          350      349       -1     
- Misses         27       38      +11     
- Partials        0        1       +1     

Impacted Files	Coverage Δ
src/utils.js	90.00% <83.33%> (-1.67%)	⬇️
src/index.js	89.88% <90.32%> (-3.04%)	⬇️

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