feat: ✨ Add TypeScript definitions

[ghost]

Moved here from DefinitelyTyped/DefinitelyTyped#54526 - see context in #575.

@kylemh

[kylemh]

🔥 This is a good intermediary, but - in the future - it'd be better (IMO) to change the source code to TS, run the tsc, and ship the compiled bundle + types.

[ghost]

Shall we? I'm hella down for that but it's gonna take time

[kylemh]

That's what I was trying to get across in DefinitelyTyped/DefinitelyTyped#54526

No need to do type declarations if we just go to TypeScript.

As an aside, it appears as though this has caused CI to fail 👀

[codecov-commenter]

Codecov Report

Merging #739 (4a08a4e) into master (c425280) will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #739      +/-   ##
==========================================
+ Coverage   99.65%   99.66%   +0.01%     
==========================================
  Files           2        2              
  Lines         287      298      +11     
  Branches       78       88      +10     
==========================================
+ Hits          286      297      +11     
  Misses          1        1              

Impacted Files	Coverage Δ
src/utils.js	100.00% <0.00%> (ø)
src/index.js	99.20% <0.00%> (+0.08%)	⬆️

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[github-actions]

🎉 This PR is included in version 14.1.0 🎉

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• GitHub release

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