startOfYear.d.ts 1.2 KB

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  1. import type { ContextOptions, DateArg } from "./types.js";
  2. /**
  3. * The {@link startOfYear} function options.
  4. */
  5. export interface StartOfYearOptions<DateType extends Date = Date>
  6. extends ContextOptions<DateType> {}
  7. /**
  8. * @name startOfYear
  9. * @category Year Helpers
  10. * @summary Return the start of a year for the given date.
  11. *
  12. * @description
  13. * Return the start of a year for the given date.
  14. * The result will be in the local timezone.
  15. *
  16. * @typeParam DateType - The `Date` type, the function operates on. Gets inferred from passed arguments. Allows to use extensions like [`UTCDate`](https://github.com/date-fns/utc).
  17. * @typeParam ResultDate - The result `Date` type, it is the type returned from the context function if it is passed, or inferred from the arguments.
  18. *
  19. * @param date - The original date
  20. * @param options - The options
  21. *
  22. * @returns The start of a year
  23. *
  24. * @example
  25. * // The start of a year for 2 September 2014 11:55:00:
  26. * const result = startOfYear(new Date(2014, 8, 2, 11, 55, 00))
  27. * //=> Wed Jan 01 2014 00:00:00
  28. */
  29. export declare function startOfYear<
  30. DateType extends Date,
  31. ResultDate extends Date = DateType,
  32. >(
  33. date: DateArg<DateType>,
  34. options?: StartOfYearOptions<ResultDate> | undefined,
  35. ): ResultDate;