update

node_modules/rxjs/operators/defaultIfEmpty.js

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+"use strict";
+var __extends = (this && this.__extends) || function (d, b) {
+    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
+    function __() { this.constructor = d; }
+    d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
+};
+var Subscriber_1 = require('../Subscriber');
+/* tslint:enable:max-line-length */
+/**
+ * Emits a given value if the source Observable completes without emitting any
+ * `next` value, otherwise mirrors the source Observable.
+ *
+ * <span class="informal">If the source Observable turns out to be empty, then
+ * this operator will emit a default value.</span>
+ *
+ * <img src="./img/defaultIfEmpty.png" width="100%">
+ *
+ * `defaultIfEmpty` emits the values emitted by the source Observable or a
+ * specified default value if the source Observable is empty (completes without
+ * having emitted any `next` value).
+ *
+ * @example <caption>If no clicks happen in 5 seconds, then emit "no clicks"</caption>
+ * var clicks = Rx.Observable.fromEvent(document, 'click');
+ * var clicksBeforeFive = clicks.takeUntil(Rx.Observable.interval(5000));
+ * var result = clicksBeforeFive.defaultIfEmpty('no clicks');
+ * result.subscribe(x => console.log(x));
+ *
+ * @see {@link empty}
+ * @see {@link last}
+ *
+ * @param {any} [defaultValue=null] The default value used if the source
+ * Observable is empty.
+ * @return {Observable} An Observable that emits either the specified
+ * `defaultValue` if the source Observable emits no items, or the values emitted
+ * by the source Observable.
+ * @method defaultIfEmpty
+ * @owner Observable
+ */
+function defaultIfEmpty(defaultValue) {
+    if (defaultValue === void 0) { defaultValue = null; }
+    return function (source) { return source.lift(new DefaultIfEmptyOperator(defaultValue)); };
+}
+exports.defaultIfEmpty = defaultIfEmpty;
+var DefaultIfEmptyOperator = (function () {
+    function DefaultIfEmptyOperator(defaultValue) {
+        this.defaultValue = defaultValue;
+    }
+    DefaultIfEmptyOperator.prototype.call = function (subscriber, source) {
+        return source.subscribe(new DefaultIfEmptySubscriber(subscriber, this.defaultValue));
+    };
+    return DefaultIfEmptyOperator;
+}());
+/**
+ * We need this JSDoc comment for affecting ESDoc.
+ * @ignore
+ * @extends {Ignored}
+ */
+var DefaultIfEmptySubscriber = (function (_super) {
+    __extends(DefaultIfEmptySubscriber, _super);
+    function DefaultIfEmptySubscriber(destination, defaultValue) {
+        _super.call(this, destination);
+        this.defaultValue = defaultValue;
+        this.isEmpty = true;
+    }
+    DefaultIfEmptySubscriber.prototype._next = function (value) {
+        this.isEmpty = false;
+        this.destination.next(value);
+    };
+    DefaultIfEmptySubscriber.prototype._complete = function () {
+        if (this.isEmpty) {
+            this.destination.next(this.defaultValue);
+        }
+        this.destination.complete();
+    };
+    return DefaultIfEmptySubscriber;
+}(Subscriber_1.Subscriber));
+//# sourceMappingURL=defaultIfEmpty.js.map