Code works in browser but not in node

[Rus1130]

I have this code, which is used to limit the amount of characters after a string of zeros. It works fine in the browser, but in node.js it doesn't work at all.

function stringifyNumber(num, zero_n) {
    let strNum = num.toString();
    let  [intPart, decPart] = strNum.split(".");

    if (!decPart) return num;

    let result = intPart + ".";
    let foundZero = false;
    let pushAllNumbers = true;
    let pushCount = zero_n;

    for (let i = 0; i < decPart.length; i++) {
        let digit = decPart[i];

        if(digit === "0") foundZero = true;
        if(pushAllNumbers) result += digit;

        if(decPart[i + 1] !== "0" && foundZero) {
            pushAllNumbers = false;
        }

        if(!pushAllNumbers) {
            if(pushCount > 0) {
                result += digit;
                pushCount--;
            }

            if(digit === '0') pushCount = zero_n;
        }
        
    }

    return result;
}

[ljharb]

what constitutes "works" or "doesn't work"?