/**
 * Return the symmetric difference across a list of Unix epoch intervals — the set of epoch
 * values covered by an odd number of the input intervals.
 *
 * - List-form generalization of `intervalXorUnix`, which is pairwise only.
 * - Implemented as a coverage sweep: each interval contributes a `+1` at its start and a `-1`
 *   one epoch unit after its end; the result is every maximal run where the running coverage
 *   count is odd. For two intervals this reduces to exactly `intervalXorUnix`'s pairwise result.
 * - Order of the input list does not matter; the result is sorted by start.
 * - Returns `[]` for an empty list, and `[]` when every value is covered an even number of
 *   times (e.g. two identical intervals cancel out).
 * - Returns `[]` when `intervals` is not an array, when any element is not a
 *   `{ start, end }` record of finite numeric (or numeric-string) values, or when any element
 *   has `start > end`.
 *
 * @param intervals array of `{ start, end }` records
 * @returns array of `{ start, end }` records covered an odd number of times, or `[]` on invalid input
 *
 * @example intervalXorAllUnix([{ start: 0, end: 1500000000 }, { start: 1400000000, end: 1700000000 }]) // [{ start: 0, end: 1399999999 }, { start: 1500000001, end: 1700000000 }]
 * @example intervalXorAllUnix([]) // []
 */
export declare function intervalXorAllUnix(intervals: Array<{
    start: number | string;
    end: number | string;
}>): Array<{
    start: number;
    end: number;
}>;