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I imagine a webhook source could be a reactive data source or any stream based API

To me a reactive data source would be something like Asana, Trello, Teamwork or on an ecommerce site it could be the cart widget. Basically any type of data that needs to react without requiring a page reload or any data source that needs to sync with another users inputs in real time.

A data source that you subscribe to and get a stream of updates. I'm building https://www.adama-platform.com/

RxJS aka the reason so many websites take 100MB of memory nowadays

Don't use it

It fairness you can do reactive data without RxJS. For example by using the vanilla web socket API. Agree that RxJS is best avoided though.

I got into RxJS cause I had to deal with an Angular project a few months ago, what's wrong with it?

You can react to state changes with an astonishingly small amount of code with JS [0]

[0]: https://github.com/curlywurlycraig/vdom-util/blob/master/src...

Link doesn't work for me. 404s

Apologies, should be good now.