import { toDate } from './toDate.js';

/**
 * @name min
 * @category Common Helpers
 * @summary Returns the earliest of the given dates.
 *
 * @description
 * Returns the earliest of the given dates.
 *
 * @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).
 *
 * @param dates - The dates to compare
 *
 * @returns The earliest of the dates
 *
 * @example
 * // Which of these dates is the earliest?
 * const result = min([
 *   new Date(1989, 6, 10),
 *   new Date(1987, 1, 11),
 *   new Date(1995, 6, 2),
 *   new Date(1990, 0, 1)
 * ])
 * //=> Wed Feb 11 1987 00:00:00
 */
function min(dates) {
  let result;

  dates.forEach((dirtyDate) => {
    const date = toDate(dirtyDate);
    if (!result || result > date || isNaN(+date)) {
      result = date;
    }
  });

  return result || new Date(NaN);
}

export { min as default, min };
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