/**
 * Gets index range of part of array.
 * @param x an array
 * @param i start index (-ve: from right) (0)
 * @param I end index (-ve: from right) (X)
 * @returns [start index, end index]
 */
declare function indexRange<T>(x: T[], i?: number, I?: number): [number, number];
export default indexRange;
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