What is the correct replacement for combineLatest inside a pipe chain?

[mikesnare]

If ALL of the combineLatest operator overloads have been deprecated, what is the expected replacement when you're in the middle of a pipe chain? Imagine you currently have this:

a$.pipe(
  filter(...),
  switchMap(...),
  map(...),
  etc(...),
  combineLatest([b$, c$])
)

First... why is that wrong? What's so bad about it that it had to be deprecated? But moving on...

What's the correct replacement? Is it expected that we restructure that to this?

combineLatest([
  a$.pipe(
    filter(...),
    switchMap(...),
    map(...),
    etc(...)
  ),
  b$,
  c$
])

or this?

a$.pipe(
  filter(...),
  switchMap(...),
  map(...),
  etc(...),
  switchMap(val => combineLatest([of(val), b$, c$]))
)

I'm not even sure that last one will work? If b$ and c$ don't replay their last emissions I don't think it's a valid replacement.

[cartant]

The replacement should be named in the deprecation message:

rxjs/src/internal/operators/combineLatest.ts

Line 9 in df51b04

/** @deprecated use {@link combineLatestWith} */

FWIW, the deprecation messages are being worked on ATM. When done, each will contain a link to a document that will explain in detail the reason for the deprecation and the changes that developers need to make to avoid relying upon what's deprecated.

[cartant]

Actually, it's in v7 that there is a sensible deprecation message. The v6 message isn't super helpful:

rxjs/src/internal/operators/combineLatest.ts

Line 11 in 01fcffc

/** @deprecated Deprecated in favor of static combineLatest. */

The reason for the deprecation was that the operator had the same name as the static creator - which wasn't a problem in v5, as the operators were on the Observable prototype. In v6, I guess the 'correct' replacement is/was to use the static creator:

a$.pipe(
  filter(...),
  switchMap(...),
  map(...),
  etc(...),
  s$ => combineLatest([s$, b$, c$])
)

[mikesnare]

Ok. There's the issue. We're on 6, not 7, so our messages only referenced the static version, and combineLatestWith doesn't exist until release 7. Thanks for the reply.