fix: add client code for node-webkit target

[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?

yes

Motivation / Use-Case

Regression

Breaking Changes

No

Additional Info

https://github.com/peter23/NW.js-svelte-boilerplate

[codecov]

Codecov Report

Merging #1942 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master   #1942      +/-   ##
=========================================
+ Coverage   91.49%   91.5%   +0.01%     
=========================================
  Files          18      18              
  Lines         835     836       +1     
  Branches      262     263       +1     
=========================================
+ Hits          764     765       +1     
  Misses         68      68              
  Partials        3       3

Impacted Files	Coverage Δ
lib/utils/addEntries.js	100% <100%> (ø)	⬆️

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[hiroppy]

thx