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node_modules/rxjs/_esm2015/observable/IntervalObservable.js

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+import { isNumeric } from '../util/isNumeric';
+import { Observable } from '../Observable';
+import { async } from '../scheduler/async';
+/**
+ * We need this JSDoc comment for affecting ESDoc.
+ * @extends {Ignored}
+ * @hide true
+ */
+export class IntervalObservable extends Observable {
+    constructor(period = 0, scheduler = async) {
+        super();
+        this.period = period;
+        this.scheduler = scheduler;
+        if (!isNumeric(period) || period < 0) {
+            this.period = 0;
+        }
+        if (!scheduler || typeof scheduler.schedule !== 'function') {
+            this.scheduler = async;
+        }
+    }
+    /**
+     * Creates an Observable that emits sequential numbers every specified
+     * interval of time, on a specified IScheduler.
+     *
+     * <span class="informal">Emits incremental numbers periodically in time.
+     * </span>
+     *
+     * <img src="./img/interval.png" width="100%">
+     *
+     * `interval` returns an Observable that emits an infinite sequence of
+     * ascending integers, with a constant interval of time of your choosing
+     * between those emissions. The first emission is not sent immediately, but
+     * only after the first period has passed. By default, this operator uses the
+     * `async` IScheduler to provide a notion of time, but you may pass any
+     * IScheduler to it.
+     *
+     * @example <caption>Emits ascending numbers, one every second (1000ms)</caption>
+     * var numbers = Rx.Observable.interval(1000);
+     * numbers.subscribe(x => console.log(x));
+     *
+     * @see {@link timer}
+     * @see {@link delay}
+     *
+     * @param {number} [period=0] The interval size in milliseconds (by default)
+     * or the time unit determined by the scheduler's clock.
+     * @param {Scheduler} [scheduler=async] The IScheduler to use for scheduling
+     * the emission of values, and providing a notion of "time".
+     * @return {Observable} An Observable that emits a sequential number each time
+     * interval.
+     * @static true
+     * @name interval
+     * @owner Observable
+     */
+    static create(period = 0, scheduler = async) {
+        return new IntervalObservable(period, scheduler);
+    }
+    static dispatch(state) {
+        const { index, subscriber, period } = state;
+        subscriber.next(index);
+        if (subscriber.closed) {
+            return;
+        }
+        state.index += 1;
+        this.schedule(state, period);
+    }
+    /** @deprecated internal use only */ _subscribe(subscriber) {
+        const index = 0;
+        const period = this.period;
+        const scheduler = this.scheduler;
+        subscriber.add(scheduler.schedule(IntervalObservable.dispatch, period, {
+            index, subscriber, period
+        }));
+    }
+}
+//# sourceMappingURL=IntervalObservable.js.map