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export default function compress(chars: string[]): number {    let writeindex = 0;
    let count = 0;    let current = "";    for (let readindex = 0; readindex < chars.length; readindex++) {        const char = chars[readindex];
        if (current === char) {            count++;        } else {            flush();
            current = char;            count = 1;        }    }    flush();
    function flush() {        if (current) {            if (count > 1) {                chars[writeindex] = current;                writeindex++;                const lenstring = count.toString();                for (const c of lenstring) {                    chars[writeindex] = c;                    writeindex++;                }            } else {                chars[writeindex] = current;                writeindex++;            }        }    }    return writeindex;}