Rxjs compatibility with old browsers

[dovranJorayev]

Help me please to define is rxjs latest versions usable with old browsers (e.g chromium v65-75), or i forced to use old versions of rxjs (e.g v4-v5). Tried to search on internet and local communities but could not get an answer?

[benlesh]

I guess I don't know what you're trying to do that isn't compatible?

[dovranJorayev]

That mean i can use all of the operators from rxjs latest version, and it will just work in old environment (e.g chromium v65-75 while actual is v120).
I plan to build a library with using rxjs as it core. And i have a requirement to build it as 2 targets.

• mylib
• mylib/compat
  I am asking because i am afraid i need to use for that purpose not same version of rxjs

[dovranJorayev]

I will need to add polyfills for promises, transpile code to old syntax but it is build time overhead. Maybe i am missing something...

[benlesh]

Whoa... polyfills for promises? So you're talking like 2013 or earlier? You might want to use RxJS 5 if that's the case, because I think in v6 or v7 we stopped supporting browsers that don't have promise implementations. Then again, if you polyfill that, I'd expect things to work with RxJS 7 and 8.

[dovranJorayev]

Not like old browsers, but Smart TV web apps. Smart TVs even new ones suits with old browser engines (e.g Chromium 70-75, when current 120+). Technically you are right, it is old browsers.
So i guess answer is
In theory, if all new features of JS will be polifiled in that environment, i can use even latest versions of rxjs.
So, correct answer will found in practice only :)