Version 7 -> 8 Roadmap

[benlesh]

NOTE (10/28/2024): RxJS 8 is on hold while observable is being standardized for the web platform. RxJS 8 should match the web platform as much as possible and support it directly. 7.0 is stable, running well, and overall solid.

This issue is outlining what needs to be done in version 7 before we can move to version 8 in earnest.

1. Once ALL items in version 7 are complete, we can consider moving the 8.x branch to master, and create a 7.x` branch.
2. Once ALL items in version 8 are finalized and implemented, we can move from 8.x.x-alpha to 8.x.x-beta.

In Version 7

• groupBy config (feat(groupBy): Support named arguments, support ObservableInputs for duration selector #5679)
• share observable resets (feat(share): use another observable to control resets #6169)
• splitBy (Deprecate partition, add splitBy method that multicasts the source sequence #3807)
• Add all exports to top level
• More configurable retry (feat(retry): Add configurable delay #6421)
• More configurable repeat (feat(repeat): now has configurable delay #6640)
• Deprecate MapTo variants (Deprecating MapTo variants. #6399, PR: chore: deprecate MapTo variants #6860)
• Deprecate retryWhen/repeatWhen? (Deprecate retryWhen and repeatWhen #6859)
• Deprecate onErrorResumeNext operator in favor of onErrorResumeNextWith (feat(onErrorResumeNextWith): renamed onErrorResumeNext and exported from the top level #6755)
• Various selectors/arguments should support ObservableInput
  • delayWhen's notifier (feat(delayWhen): delayWhen's delayDurationSelector should support ObservableInput #7049),
  • buffer's closingNotifier (feat(buffer): closingNotifier should support ObservableInput #7073),
  • distinct's flushes (feat(distinct): flush supports ObservableInput #7081),
  • repeatWhen's notifier (feat(repeatWhen): notifier supports ObservableInput #7103),
  • sample's notifier (feat(sample): notifier supports ObservableInput #7104),
  • retryWhen's notifier (feat(retryWhen): notifier supports ObservableInput #7105),
  • sequenceEqual's compareTo (feat(sequenceEqual): compareTo should support ObservableInput #7102),
  • ShareConfig's resetOnError, resetOnComplete and resetOnRefCountZero (feat(share): ShareConfig factory properties should support ObservableInput #7093),
  • skipUntil's notifier (feat(skipUntil): notifier should support ObservableInput #7091) and
  • window's windowBoundaries (feat(window): windowBoundaries should support ObservableInput #7088)

Before Version 8 is released

• Remove all deprecated APIs marked to be removed in v8 or marked deprecated ages ago.
• Remove source parameters from predicates. (Deprecating these via the type system effects problems - see chore: deprecate thisArg signatures #6361.)
• Ensure we're publishing only ES2021 or later and CJS. Drop tslib. (ESM version is never used #6321)
• Drop all Internet Explorer support into a pit of flames! 🔥 IE 🔥 🥳
• Idempotent subscription add (feat(Subscription): idempotent add and remove of teardowns #6401)
• Replace all external uses of any with unknown. (This could likely be non-breaking, FWIW.)
• productize our internals for creating operators (Productize operator creation internals #6803)
• Implement [Symbol.asyncIterator]() on Observable (TBD. We should try this out in an alpha, at least. Issue: Implement Symbol.asyncIterator on Observable #6857)
• Convert repo to monorepo (Monorepo and Splitting Out To Different Packages #6786)
  • Docs app can be a separate project under monorepo
  • Operator Decision Tree can also likely be its own project under monorepo
  • Keep rxjs as "whole package". (It's not going away, ever, really)
  • Publish @rxjs/observable with just Observable.
  • Publish @rxjs/ajax
  • Publish @rxjs/fetch
  • Publish @rxjs/testing
  • Decide on how we'll do other packages: Current thoughts are that we could publish a package for each operator, even. Subjects and multicasting might be trickier, but maybe not. Maybe individual packages is right for all. Needs discussion.
• ??? TBD

During Version 8

• Create new schedulers and deprecate old schedulers.
• Implement Symbol.asyncIterator on observable. (Implement Symbol.asyncIterator on Observable #6779)

[kbrilla]

🔥 IE 🔥 🥳 - every time I see that statement in some repo it makes my day better

[MaximeBernard]

Since "??? TBD" seems to imply we can suggest anything, what about #2686?

It seems to be a recurring "issue" people are having to configure headers for every request (most popular seem to be Bearer, CorrelationId and Content-Type).

While it's not "hard" to make your own ajax, I feel it's a bit sad everyone has to write that piece of code and it might be helpful for everyone to have an helper provided by rxjs.