import { concat } from '../observable/concat'; import { take } from './take'; import { ignoreElements } from './ignoreElements'; import { mapTo } from './mapTo'; import { mergeMap } from './mergeMap'; export function delayWhen(delayDurationSelector, subscriptionDelay) { if (subscriptionDelay) { return function (source) { return concat(subscriptionDelay.pipe(take(1), ignoreElements()), source.pipe(delayWhen(delayDurationSelector))); }; } return mergeMap(function (value, index) { return delayDurationSelector(value, index).pipe(take(1), mapTo(value)); }); } //# sourceMappingURL=delayWhen.js.map