Cannot call connect() after using publish()

[Niladri24dutta]

In order to create hot observable i was following the below approach

1. Create Observable from interval()
2. Publish that Observable using publish() to create a ConnectableObservable
3. Call connect() on that ConnectableObservable

But I am getting the below error -

Property 'connect' does not exists on type Observable. I knowconnectexists only onConnectableObservable` but in Rxjs 5 this below code was working fine.

let $hotstream = Observable.interval(1000)
                           .take(6)
                           .publish();
$hotstream.connect();

RxJS version: 6.0.0

Code to reproduce: This is my code for Rxjs 6

let $hotstream = interval(1000).pipe(take(6),publish());
$hotstream.connect()

Expected behavior: Should be able to call connect after using publish.

Actual behavior: I have to perform an explicit cast like below to call connect.
let $hotstream = <ConnectableObservable<any>>interval(1000).pipe(take(6),publish()); $hotstream.connect();
P.S The same issue is occurring for refCount.

Additional information: Is it required to do an explicit casting like this to call connect() now?
I also noticed few changes in the publish method from 5x to 6x version.
in 5x version the below signature was called -
export function publish<T>(this: Observable<T>): ConnectableObservable<T>;
But in 6x version the signature has changed to -
export function publish<T>(): UnaryFunction<Observable<T>, ConnectableObservable<T>>; which basically returns a function that accepts an Obervable parameter and returns a ConnectableObservable<T>. So what is the best way to call connect in 6x version?

[cartant]

See #2972.

[benlesh]

Closing as duplicate.