Systax error during installation

[arjunmenon]

I am getting a systax error here during Step 4: run the server

wifi-setup/index.js

Line 19 in 65dc097

.catch(() => { startServer(); startAP() });

pi@raspberrypi:~/wifi-setup $ sudo node index.js
/home/pi/wifi-setup/index.js:20
  .catch(() => { startServer(); startAP(); });
          ^
SyntaxError: Unexpected token )
    at exports.runInThisContext (vm.js:73:16)
    at Module._compile (module.js:443:25)
    at Object.Module._extensions..js (module.js:478:10)
    at Module.load (module.js:355:32)
    at Function.Module._load (module.js:310:12)
    at Function.Module.runMain (module.js:501:10)
    at startup (node.js:129:16)
    at node.js:814:3

And expectedly running the next steps

$ sudo cp config/wifi-setup.service /lib/systemd/system
$ sudo vi /lib/systemd/system/wifi-setup.service # edit paths as needed
$ sudo systemctl enable wifi-setup

does nothing. Not after a reboot and not manually doing sudo systemctl start wifi-setup.

How to debug this issue?