Fix resolution logic

[alexander-akait]

This PR contains a:

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

Motivation / Use-Case

ignore main and other files without sass/scss/css extensions

Breaking Changes

Potential yes, if you really on invalid resolution

Additional Info

No

[codecov]

Codecov Report

Merging #851 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #851   +/-   ##
=======================================
  Coverage   97.20%   97.20%           
=======================================
  Files           9        9           
  Lines         179      179           
  Branches       60       60           
=======================================
  Hits          174      174           
  Misses          5        5           

Impacted Files	Coverage Δ
src/webpackImporter.js	97.05% <ø> (ø)

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