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function minimumAbsDifference(arr: number[]): number[][] {    arr.sort((a, b) => a - b);    return arr.reduce(        ([res, num], v, i, a): [number[][], number] => {            if (i + 1 < a.length) {                if (num > Math.abs(v - a[i + 1])) {                    return [[[v, a[i + 1]]], Math.abs(v - a[i + 1])];                } else if (num === Math.abs(v - a[i + 1])) {                    res.push([v, a[i + 1]]);                }            }            return [res, num];        },        [[], Infinity] as [number[][], number],    )[0];}export default minimumAbsDifference;