timing-provider/build/es2019/operators/match-pong-with-ping.js

An implementation of the timing provider specification.

import { filter, map, withLatestFrom } from 'rxjs';
import { isNotNullish } from 'rxjs-etc';
export const matchPongWithPing = (localSentTimesSubject) => (source) => source.pipe(withLatestFrom(localSentTimesSubject), map(([{ index, remoteReceivedTime, remoteSentTime, timestamp }, [startIndex, localSentTimes]]) => {
    if (index < startIndex) {
        return null;
    }
    const numberOfMissingPings = index - startIndex;
    const [localSentTime, ...unansweredPings] = localSentTimes.slice(numberOfMissingPings);
    localSentTimesSubject.next([startIndex + numberOfMissingPings + 1, unansweredPings]);
    return [localSentTime, remoteReceivedTime, remoteSentTime, timestamp];
}), filter(isNotNullish));
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