Function useEventRate

useEventRate<S extends SeriesSchema>(
    source: Windowable<S>,
    windowDuration: RollingWindow,
    options?: UseSnapshotOptions,
): number
Subscribe to a live source, maintain a .window(duration) view over it, and return its events-per-second as a reactive number.
Type Parameters
- S extends SeriesSchema
Parameters
- source: Windowable<S>
- windowDuration: RollingWindow
- Optionaloptions: UseSnapshotOptions
Returns number
Example
```
const eventRate = useEventRate(liveSeries, '1m');
// <div>EVENT RATE {eventRate.toFixed(1)}/s</div>
```
Sugar over live.window(duration).eventRate() plus a subscription that re-reads on each push and throttles updates. Closes the boilerplate that the gRPC experiment's M1 friction notes surfaced — useCurrent(live, { cpu: 'count' }, { tail: '1m' }).cpu / 60 collapses to one hook.

Throttling matches useSnapshot: throttle: 100 ms by default. Returns 0 until the first event lands.
Throws
TypeError if windowDuration is a count-based window (a number) — eventRate requires a time denominator. Pass a duration string like '1m', '30s', or a number-of-ms via DurationInput instead.
- Defined in react/src/useEventRate.ts:41