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export default function frequencySort(s: string): string {    const storage = new Map<string, number>();    for (const w of s) {        storage.set(w, 1 + (storage.get(w) ?? 0));    }    const sb: string[] = [];    for (        const [c, frequency] of [...storage.entries()].sort((a, b) => {            return +b[1] - a[1];        })    ) {        for (let j = 0; j < frequency; j++) {            sb.push(c);        }    }    return sb.join("");}