[typescript-migration] day.js

[mirus-ua]

---

name: Migrate day.jsx

Description

Linked issue: https://github.com/Hacker0x01/react-datepicker/issues/4700

Changes day.jsx was migrated to ts + added JSDocs

Contribution checklist

• [x] I have followed the contributing guidelines.
• [x] I have added sufficient test coverage for my changes.
• [x] I have formatted my code with Prettier and checked for linting issues with ESLint for code readability.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 97.16%. Comparing base (66ecc33) to head (ee5facd). Report is 14 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #4713 +/- ## ========================================== - Coverage 97.23% 97.16% -0.07% ========================================== Files 22 18 -4 Lines 2132 1765 -367 Branches 914 752 -162 ========================================== - Hits 2073 1715 -358 + Misses 59 50 -9 ```

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