var opsys = process.platform;
if (opsys == "darwin") {
opsys = "MacOS";
} else if (opsys == "win32" || opsys == "win64") {
opsys = "Windows";
} else if (opsys == "linux") {
opsys = "Linux";
}
console.log(opsys) // I don't know what linux is.
const os = require("os"); // Comes with node.js
console.log(os.type());