refactor: add getToken()

[drazisil-codecov]

Add getToken() helper to ensure correct token is set
Configure typescript linter and add missing types

[codecov]

Codecov Report

Merging #221 (ce14f26) into master (9ddd5cf) will increase coverage by 0.55%.
The diff coverage is 92.85%.

❗ Current head ce14f26 differs from pull request most recent head b913c3f. Consider uploading reports for the commit b913c3f to get more accurate results

@@            Coverage Diff             @@
##           master     #221      +/-   ##
==========================================
+ Coverage   93.86%   94.42%   +0.55%     
==========================================
  Files          22       22              
  Lines         766      771       +5     
  Branches      142      140       -2     
==========================================
+ Hits          719      728       +9     
+ Misses         14       12       -2     
+ Partials       33       31       -2     

Flag	Coverage Δ
alpine	94.42% <92.85%> (+0.55%)	⬆️
linux	94.42% <92.85%> (+0.55%)	⬆️
linux-without-git	94.42% <92.85%> (+0.55%)	⬆️
macos	94.42% <92.85%> (+0.55%)	⬆️
macos-without-git	94.42% <92.85%> (+0.55%)	⬆️
windows	93.77% <85.71%> (+0.56%)	⬆️
windows-without-git	93.77% <85.71%> (+0.56%)	⬆️

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Impacted Files	Coverage Δ
src/helpers/logger.js	100.00% <ø> (ø)
src/index.js	84.52% <66.66%> (+4.06%)	⬆️
src/helpers/files.js	94.36% <100.00%> (+0.08%)	⬆️
src/helpers/validate.js	100.00% <100.00%> (ø)

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