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import { Subscriber } from '../Subscriber'; export function pairwise() { return (source) => source.lift(new PairwiseOperator()); } class PairwiseOperator { call(subscriber, source) { return source.subscribe(new PairwiseSubscriber(subscriber)); } } class PairwiseSubscriber extends Subscriber { constructor(destination) { super(destination); this.hasPrev = false; } _next(value) { let pair; if (this.hasPrev) { pair = [this.prev, value]; } else { this.hasPrev = true; } this.prev = value; if (pair) { this.destination.next(pair); } } } //# sourceMappingURL=pairwise.js.map