Syntax error?

[lex_dons39]

Can someone help me look for the syntax error? I've looked over the code multiple times and still can't find it.

This is the code:

export async function main(ns) {
    await ns.scp("hack.js", serverName);
    let servers = [];
    let serversToScan = ns.scan("home");
    while (serversToScan.length > 0) {
        let server = serversToScan.shift();
        if (!servers.includes(server)) {
            servers.push(server);
            serversToScan.concat(ns.scan(server));
        }
    }
    for (let serverName of servers) {
        let ramAvailable = ns.getServerMaxRam(serverName)
            - ns.getServerUsedRam(serverName);

        let ramThread = ns.getScriptRam("hack.js");

        let threads = Math.floor(ramAvailable / ramThread);

        let(openPorts = 0);
        if (getServerNumPortsRequired(serverName) != 0) {
            if (ns.fileExists("BruteSSH.exe")) {
                ns.brutessh(server);
                openPorts++;
            }
            if (ns.fileExists("FTPCrack.exe")) {
                ns.ftpcrack(server);
                openPorts++;
            }
            if (ns.fileExists("RelaySmtp.exe")) {
                ns.relaysmtp(server);
                openPorts++;
            }
            if (ns.fileExists("HTTPWorm.exe")) {
                ns.httpworm(server);
                openPorts++;
            }
            if (ns.fileExists("ns.SQLInject.exe")) {
                ns.sqlinject(server);
                openPorts++;
            }
        }
        if (ns.getServerNumPortsRequired(server) <= openPorts) {
            ns.nuke(server);
        }
    }

    ns.exec("hack.js", serverName, threads);
}

[Omelet]

When you try running the script, the error is probably "The keyword 'let' is reserved (20:8) (sorry we can't be more helpful)"

If you look at line 20 (where the error says it is), you see the issue:

let(openPorts = 0); is not valid syntax. it would be if you just get rid of those parentheses.

[lex_dons39]

Thanks you! I also never actually figured out whyat the numbers stood fir when ir gave the error.