--- /dev/null
+import { QueueScheduler } from './QueueScheduler';
+/**
+ *
+ * Queue Scheduler
+ *
+ * <span class="informal">Put every next task on a queue, instead of executing it immediately</span>
+ *
+ * `queue` scheduler, when used with delay, behaves the same as {@link asyncScheduler} scheduler.
+ *
+ * When used without delay, it schedules given task synchronously - executes it right when
+ * it is scheduled. However when called recursively, that is when inside the scheduled task,
+ * another task is scheduled with queue scheduler, instead of executing immediately as well,
+ * that task will be put on a queue and wait for current one to finish.
+ *
+ * This means that when you execute task with `queue` scheduler, you are sure it will end
+ * before any other task scheduled with that scheduler will start.
+ *
+ * ## Examples
+ * Schedule recursively first, then do something
+ * ```ts
+ * import { queueScheduler } from 'rxjs';
+ *
+ * queueScheduler.schedule(() => {
+ * queueScheduler.schedule(() => console.log('second')); // will not happen now, but will be put on a queue
+ *
+ * console.log('first');
+ * });
+ *
+ * // Logs:
+ * // "first"
+ * // "second"
+ * ```
+ *
+ * Reschedule itself recursively
+ * ```ts
+ * import { queueScheduler } from 'rxjs';
+ *
+ * queueScheduler.schedule(function(state) {
+ * if (state !== 0) {
+ * console.log('before', state);
+ * this.schedule(state - 1); // `this` references currently executing Action,
+ * // which we reschedule with new state
+ * console.log('after', state);
+ * }
+ * }, 0, 3);
+ *
+ * // In scheduler that runs recursively, you would expect:
+ * // "before", 3
+ * // "before", 2
+ * // "before", 1
+ * // "after", 1
+ * // "after", 2
+ * // "after", 3
+ *
+ * // But with queue it logs:
+ * // "before", 3
+ * // "after", 3
+ * // "before", 2
+ * // "after", 2
+ * // "before", 1
+ * // "after", 1
+ * ```
+ */
+export declare const queueScheduler: QueueScheduler;
+/**
+ * @deprecated renamed. Use {@link queueScheduler}
+ */
+export declare const queue: QueueScheduler;