Given the issue #6067 seems to be fairly difficult to solve, and given that we have renamed everything such that there are no conflicts between things like concat the creation function, and concat the operator, etc. Maybe it's time we talk about exporting all primary APIs from rxjs proper.

1. It's a non-breaking change.
2. It's the direction we've all discussed going many times.
3. It's easier to deal with, overall.

I'm talking about:

import { of, interval, take, concatWith, map } from 'rxjs';

interval(1000).pipe(
  take(3),
  concatWith(of('done')),
  map(x => `Tick: ${x}`)
)