Hi I found a bug in stop watch

[ivanff]

https://stackblitz.com/edit/rxjs-stop-watch?file=index.ts

An excellent starting point, thank you, but if you reduce the interval to say 1 millisecond, then apparently due to the execution of javascript, the stopwatch does not work correctly, greatly underestimating the time.

I came across an operator that can partially fix this problem.

switchMap((state: State) => {
if (state.count) {
return interval(
state.speed
).pipe(
timeInterval(),
tap((_) => {
const value = _.interval / state.speed
state.value += state.countup ? value : -value
}),
tap(_ => this.setValue(state.value))
)
} else {
return NEVER
}
})