fix: convert modules to typescript

[ph-fritsche]

What:

Convert JS modules to Typescript.

Why:

Closes #608

Checklist:

• N/A Documentation
• N/A Tests
• N/A Typings
• Ready to be merged

[codecov]

Codecov Report

Merging #609 (554e79e) into master (74d191c) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #609   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           47        47           
  Lines          879       880    +1     
  Branches       330       331    +1     
=========================================
+ Hits           879       880    +1     

Impacted Files	Coverage Δ
src/blur.ts	100.00% <100.00%> (ø)
src/focus.ts	100.00% <100.00%> (ø)
src/hover.ts	100.00% <100.00%> (ø)
src/tab.ts	100.00% <100.00%> (ø)

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[github-actions]

🎉 This PR is included in version 13.0.7 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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