fix: crash when publicPath is function

[alexander-akait]

This PR contains a:

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

Motivation / Use-Case

fixes #873

Breaking Changes

No

Additional Info

There is limitation - hash is xxxxx, because we don't know hash at this stage, we are building modules and hash calculation is impossible right now

[codecov]

Codecov Report

Merging #881 (b36bb40) into master (0651fa5) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #881      +/-   ##
==========================================
+ Coverage   91.28%   91.32%   +0.03%     
==========================================
  Files           6        6              
  Lines         792      795       +3     
  Branches      214      216       +2     
==========================================
+ Hits          723      726       +3     
  Misses         63       63              
  Partials        6        6              

Impacted Files	Coverage Δ
src/loader.js	90.00% <100.00%> (+0.19%)	⬆️

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[roland-reed]

When will new version containing this fix be published? It seems that this PR has been merged over 20 days but no new version is published 😂 @alexander-akait