fix: innerFrom throw ObservableTypeError when Observable Class is different (different version, duplicate code)

[MeetzhDing]

When using webpack or rollup, we may bundle different version rxjs into websites.

Function using innerFrom (eg. mergeMap, from) will throw InvalidObservableTypeError when input is not instanceOf current version Observable, and this problem is to hard to locate.

The util isObservable can solve this problem.

@benlesh

[MeetzhDing]

@benlesh please have a look at this pr.

[tien]

Same issue is happening with bundler like Vite

[benlesh]

Hi @MeetzhDing — thank you for the time, care, and thoughtfulness you put into this pull request. I’m sorry we weren’t able to respond in a reasonable timeframe. Since the codebase and surrounding context have moved on and this hasn’t seen recent activity, I’m going to close it for now. That’s a reflection of our delayed triage, not a lack of appreciation for your contribution. If the change is still relevant, please feel welcome to open a fresh pull request against the current codebase. Thank you again for contributing to RxJS and for your patience.

— Ben