feat: reuse AST from other loaders

[alexander-akait]

This PR contains a:

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

Motivation / Use-Case

fixes #425

Breaking Changes

No

Additional Info

No

[codecov]

Codecov Report

Merging #468 into master will increase coverage by 0.06%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #468      +/-   ##
==========================================
+ Coverage   97.41%   97.47%   +0.06%     
==========================================
  Files           5        5              
  Lines         232      238       +6     
  Branches       67       73       +6     
==========================================
+ Hits          226      232       +6     
  Misses          6        6              

Impacted Files	Coverage Δ
src/index.js	100.00% <100.00%> (ø)

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