fix: class fields fix

[motss]

Changes

1. Add "useDefineForClassFields": false in tsconfig.json
2. Add missing typescript to devDependencies

[codecov[bot]]

Codecov Report

Merging #216 (9cb7941) into main (3582b2c) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff             @@
##              main      #216    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files           58        42    -16     
  Lines         3305      2743   -562     
  Branches       238       166    -72     
==========================================
- Hits          3305      2743   -562     

Flag	Coverage Δ
unit_tests	100.00% <ø> (ø)
unit_tests_helpers	?

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Impacted Files	Coverage Δ
src/helpers/warn-undefined-element.ts
src/helpers/split-string.ts
src/helpers/focus-element.ts
src/helpers/to-closest-target.ts
src/helpers/clamp-value.ts
src/helpers/to-year-list.ts
src/helpers/date-validator.ts
src/helpers/to-day-diff-inclusive.ts
src/helpers/to-next-selectable-date.ts
src/helpers/to-next-selected-date.ts
... and 6 more

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