Best practice for realtime/event-based apps?

[AnsonHwang]

It seem EventSource is another good choice.

Is EventSource available in Retool's "Run JS Code" Resource?

As the title says, I'm wondering if there is a way to use an EventSource instance (EventSource - Web APIs | MDN) in Retool's Javascript resource. I saw in an old post from 2020 a user was citing code that uses EventSource directly in retool (Process Incoming Webhooks for Retool). However, when I tried to use it myself in the JS resource it tells me that " 'EventSource' is not defined". Is there any way I can add/enable EventSource? Thanks