fix: memory leak

[alexander-akait]

This PR contains a:

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

Motivation / Use-Case

fixes #172

Breaking Changes

No

Additional Info

Hard to tests 😞

[codecov]

Codecov Report

Merging #174 into master will increase coverage by 0.62%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #174      +/-   ##
==========================================
+ Coverage   96.81%   97.43%   +0.62%     
==========================================
  Files           4        4              
  Lines         157      156       -1     
  Branches       40       40              
==========================================
  Hits          152      152              
+ Misses          5        4       -1     

Impacted Files	Coverage Δ
src/index.js	99.07% <100.00%> (+0.90%)	⬆️

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