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"use strict";
exports.interval = interval;
var _index = require("./toDate.js");

/**
 * The {@link interval} function options.
 */

/**
 * @name interval
 * @category Interval Helpers
 * @summary Creates an interval object and validates its values.
 *
 * @description
 * Creates a normalized interval object and validates its values. If the interval is invalid, an exception is thrown.
 *
 * @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 start - The start of the interval.
 * @param end - The end of the interval.
 * @param options - The options object.
 *
 * @throws `Start date is invalid` when `start` is invalid.
 * @throws `End date is invalid` when `end` is invalid.
 * @throws `End date must be after start date` when end is before `start` and `options.assertPositive` is true.
 *
 * @returns The normalized and validated interval object.
 */
function interval(start, end, options) {
  const _start = (0, _index.toDate)(start);
  if (isNaN(+_start)) throw new TypeError("Start date is invalid");

  const _end = (0, _index.toDate)(end);
  if (isNaN(+_end)) throw new TypeError("End date is invalid");

  if (options?.assertPositive && +_start > +_end)
    throw new TypeError("End date must be after start date");

  return { start: _start, end: _end };
}