if (proc !== null) {

        proc.on("exit", (code, signal) => {
            done();
        });

        var isWin = /^win/.test(process.platform);
        if (!isWin) {
            kill(proc.pid);
        } else {
            exec(`taskkill /PID ${proc.pid} /T /F`, (error, stdout, stderr) => {
                if (error !== null) {
                    console.log('exec error: ' + error);
                }
            });
        }
    } else {
        done();
    }