fix(types): Fix type errors with date-fns v4 #605
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This PR fixes the incorrect TypeScript type reference in the locale definition and date utils files that caused build errors when using the library with date-fns@4, Angular ≥ 18 and without
"skipLibCheck": truedate-fns@4 no longer exports Locale from date-fns/locale, TypeScript (and Angular’s ng-packagr) produce a type error during library build:
This happened because TypeScript inferred the type of the locale object (ru, de) from an internal Locale symbol inside date-fns/locale, which is not part of the public API.
Fixes #544