How to throw stream error in custom operator? - rxjs

Question

I found cstom operator that I want to use.
This is an operator that retries http requests. Code is from Stephen Fluin: https://github.com/StephenFluin/http-operators/blob/master/operators/retryExponentialBackoff.operator.ts.
Problem is that if after all these reties it does not puts error in stream only completes.
I want it to throw an error. How to do it?
I think this part should be modified:
error(err: any) {
if (count <= maxTries) {
subscription.add(scheduler.schedule(subscribe, initialWait * Math.pow(2, count++)));
}
},
Here is whole operator's class
/**
* Repeats underlying observable on a timer
*
* #param maxTries The maximum number of attempts to make, or -1 for unlimited
* #param initialWait Number of seconds to wait for refresh
*/
export const retryExponentialBackoff = (
maxTries = -1,
initialWait = 1,
scheduler: SchedulerLike = asyncScheduler
) => <T>(
source: Observable<T>
) => {
return new Observable<T>(subscriber => {
let count = 1;
const subscription = new Subscription();
const subscribe = () =>
subscription.add(
source.subscribe({
next(value: T) {
count = 1;
subscriber.next(value);
},
error(err: any) {
if (count <= maxTries) {
subscription.add(scheduler.schedule(subscribe, initialWait * Math.pow(2, count++)));
}
},
complete() {
subscriber.complete();
},
})
);
subscribe();
return subscription;
});
};

Answer 1

I would try to add the error bubbling to the subscriber like so:
error(err: any) {
if (count <= maxTries) {
subscription.add(scheduler.schedule(subscribe, initialWait * Math.pow(2, count++)));
}
else {
subscriber.error(err);
}
},
So that after your maxTries count have een exhausted the error is emitted downstream.