/**
 * Split a UTC 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`.
 * - Boundaries are computed from the total elapsed nanoseconds (via `Duration.prototype.total`
 *   with `relativeTo` set to `start`) — no DST is involved, since UTC has no time zone offset.
 * - `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`, leap-second strings).
 *
 * @param start ISO UTC datetime string for the interval start
 * @param end ISO UTC datetime 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 intervalDivideEquallyUtc("2024-01-01T00:00:00Z", "2024-01-04T00:00:00Z", 3) // [{ start: "2024-01-01T00:00:00Z", end: "2024-01-02T00:00:00Z" }, { start: "2024-01-02T00:00:00Z", end: "2024-01-03T00:00:00Z" }, { start: "2024-01-03T00:00:00Z", end: "2024-01-04T00:00:00Z" }]
 * @example intervalDivideEquallyUtc("2024-01-01T00:00:00Z", "2024-01-04T00:00:00Z", 1) // [{ start: "2024-01-01T00:00:00Z", end: "2024-01-04T00:00:00Z" }]
 * @example intervalDivideEquallyUtc("2024-01-01T00:00:00Z", "2024-01-04T00:00:00Z", 0) // []
 * @example intervalDivideEquallyUtc("invalid", "2024-01-04T00:00:00Z", 3) // []
 */
export declare function intervalDivideEquallyUtc(start: string, end: string, n: number): Array<{
    start: string;
    end: string;
}>;