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import { Observable } from '../Observable';
import { async } from '../scheduler/async';
import { SchedulerLike, OperatorFunction } from '../types';
import { scan } from './scan';
import { defer } from '../observable/defer';
import { map } from './map';
export function timeInterval<T>(scheduler: SchedulerLike = async): OperatorFunction<T, TimeInterval<T>> {
return (source: Observable<T>) => defer(() => {
return source.pipe(
// HACK: the typings seem off with scan
scan(
({ current }, value) => ({ value, current: scheduler.now(), last: current }),
{ current: scheduler.now(), value: undefined, last: undefined }
) as any,
map<any, TimeInterval<T>>(({ current, last, value }) => new TimeInterval(value, current - last)),
);
});
}
export class TimeInterval<T> {
constructor(public value: T, public interval: number) {}
}
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