chore: fix types

[alexander-akait]

• This is a bugfix
• This is a feature
• This is a code refactor
• This is a test update
• This is a docs update
• This is a metadata update

For Bugs and Features; did you add new tests?

fixes #4796

Motivation / Use-Case

Breaking Changes

Additional Info

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.30 🎉

Comparison is base (22fb1e5) 91.83% compared to head (31ac59b) 92.13%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4797      +/-   ##
==========================================
+ Coverage   91.83%   92.13%   +0.30%     
==========================================
  Files          16       16              
  Lines        1665     1665              
  Branches      624      624              
==========================================
+ Hits         1529     1534       +5     
+ Misses        125      120       -5     
  Partials       11       11              

Impacted Files	Coverage Δ
lib/Server.js	93.77% <ø> (+0.24%)	⬆️

... and 1 file with indirect coverage changes

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