/**
 * Split a time interval into `n` equal-length sub-intervals.
 *
 * - Returns an array of `n` `{ start, end }` records that tile the original interval, each
 *   record's `end` equal to the next record's `start`.
 * - Time units are fixed-length, so boundaries are computed to nanosecond precision — the split
 *   is exact whenever the total nanoseconds divides evenly by `n`, and off by at most one
 *   nanosecond otherwise.
 * - `n === 1` returns the original interval unchanged, as a single-element array.
 * - A zero-length interval (`start === end`) returns `n` identical zero-length sub-intervals.
 * - Returns `[]` when `n` is not a positive integer, or on invalid input (unparseable
 *   start/end, `start > end`).
 *
 * @param start ISO PlainTime string for the interval start
 * @param end ISO PlainTime string for the interval end
 * @param n number of equal sub-intervals to produce (positive integer)
 * @returns array of `n` `{ start, end }` records, or `[]` on invalid input
 *
 * @example intervalDivideEquallyTime("09:00:00", "17:00:00", 4) // [{ start: "09:00:00", end: "11:00:00" }, { start: "11:00:00", end: "13:00:00" }, { start: "13:00:00", end: "15:00:00" }, { start: "15:00:00", end: "17:00:00" }]
 * @example intervalDivideEquallyTime("09:00:00", "17:00:00", 3) // [{ start: "09:00:00", end: "11:40:00" }, { start: "11:40:00", end: "14:20:00" }, { start: "14:20:00", end: "17:00:00" }]
 * @example intervalDivideEquallyTime("09:00:00", "17:00:00", 1) // [{ start: "09:00:00", end: "17:00:00" }]
 * @example intervalDivideEquallyTime("09:00:00", "17:00:00", 0) // []
 * @example intervalDivideEquallyTime("invalid", "17:00:00", 3) // []
 */
export declare function intervalDivideEquallyTime(start: string, end: string, n: number): Array<{
    start: string;
    end: string;
}>;