But what about the analogue of jquery beforeSend in the BX framework?

Question

1C-Bitrix

Hello all comrades!
I'm trying to get rid of jquery, but as it turned out for me, it's not quite easy and there are a lot of reasons for this. jquery has many plugins and is very good in terms of usability. At some point, I decided to abandon jquery inside Bitrix projects, due to the existence of my own js framework. Using BX after using jquery for a long time turned out to be quite simple and fun.
I encountered a banal absence of an event like jquery - beforeSend. There is a possibility that I searched badly, but rummaged through the entire core_ajax.js and did not find it.
BX also has a BX.addCustomEvent function on which you can hang a handler, for example, "onAjaxSuccess" or "onAjaxFailure", but what if you need to do some actions before sending.
If you write a custom handler, tell me where to start? Maybe there is a kind person who wrote and can share the finished tool?
In any case, I will accept any help!

Answer 1

Bitrix recently included vue.js in the standard distribution, this should simplify your task, here is a short instruction