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export default function merge(intervals: number[][]): number[][] {    if (intervals.length == 0) {        return [];    }    intervals.sort((a, b) => a[0] - b[0]);    const merged: number[][] = [];
    for (const interval of intervals) {        if (merged.length === 0 || merged.slice(-1)[0][1] < interval[0]) {            merged.push(interval);        } else {            merged[merged.length - 1][1] = Math.max(                merged[merged.length - 1][1],                interval[1],            );        }    }
    return merged;}