Typescript improvements

[GantMan]

Tagged Steve if he has a cycle. If not, will just merge bc yarn build works... and that's the real judge here, amirite?

[GantMan]

o damnit tests!

[codecov[bot]]

Codecov Report

Merging #132 into master will decrease coverage by 0.27%. The diff coverage is 95.83%.

@@            Coverage Diff             @@
##           master     #132      +/-   ##
==========================================
- Coverage    76.8%   76.53%   -0.28%     
==========================================
  Files          22       22              
  Lines         388      392       +4     
  Branches       73       74       +1     
==========================================
+ Hits          298      300       +2     
- Misses         66       67       +1     
- Partials       24       25       +1

Impacted Files	Coverage Δ
src/extensions/functions/checkDir.ts	100% <100%> (ø)	:arrow_up:
...extensions/functions/removeNonVersionCharacters.ts	100% <100%> (ø)	:arrow_up:
src/extensions/functions/checkRequirement.ts	80.59% <100%> (ø)	:arrow_up:
src/extensions/functions/getLineWithVersion.ts	83.33% <100%> (ø)	:arrow_up:
src/extensions/solidarity-extension.ts	100% <100%> (ø)	:arrow_up:
src/types.ts	100% <100%> (ø)	:arrow_up:
src/extensions/functions/getVersion.ts	70% <100%> (ø)	:arrow_up:
src/extensions/functions/checkCLIForUpdates.ts	89.47% <100%> (ø)	:arrow_up:
src/extensions/functions/checkENV.ts	100% <100%> (ø)	:arrow_up:
src/extensions/functions/checkFile.ts	100% <100%> (ø)	:arrow_up:
... and 6 more

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