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export default function frequencySort(nums: number[]): number[] {    const storage = new Map<number, number>();    for (const num of nums) {        storage.set(num, 1 + (storage.get(num) ?? 0));    }    return [...storage.entries()]        .sort((a, b) => {            if (-b[1] + a[1] < 0) {                return -1;            }            if (-b[1] + a[1] > 0) {                return 1;            }
            return -a[0] + b[0];        })        .map((a) => Array(a[1]).fill(a[0]))        .flat();}