feat: initial commit

node_modules/rxjs/internal/observable/defer.d.ts

@@ -0,0 +1,52 @@
+import { Observable } from '../Observable';
+import { ObservedValueOf, ObservableInput } from '../types';
+/**
+ * Creates an Observable that, on subscribe, calls an Observable factory to
+ * make an Observable for each new Observer.
+ *
+ * <span class="informal">Creates the Observable lazily, that is, only when it
+ * is subscribed.
+ * </span>
+ *
+ * ![](defer.png)
+ *
+ * `defer` allows you to create the Observable only when the Observer
+ * subscribes, and create a fresh Observable for each Observer. It waits until
+ * an Observer subscribes to it, and then it generates an Observable,
+ * typically with an Observable factory function. It does this afresh for each
+ * subscriber, so although each subscriber may think it is subscribing to the
+ * same Observable, in fact each subscriber gets its own individual
+ * Observable.
+ *
+ * ## Example
+ * ### Subscribe to either an Observable of clicks or an Observable of interval, at random
+ * ```ts
+ * import { defer, fromEvent, interval } from 'rxjs';
+ *
+ * const clicksOrInterval = defer(function () {
+ *   return Math.random() > 0.5
+ *     ? fromEvent(document, 'click')
+ *     : interval(1000);
+ * });
+ * clicksOrInterval.subscribe(x => console.log(x));
+ *
+ * // Results in the following behavior:
+ * // If the result of Math.random() is greater than 0.5 it will listen
+ * // for clicks anywhere on the "document"; when document is clicked it
+ * // will log a MouseEvent object to the console. If the result is less
+ * // than 0.5 it will emit ascending numbers, one every second(1000ms).
+ * ```
+ *
+ * @see {@link Observable}
+ *
+ * @param {function(): SubscribableOrPromise} observableFactory The Observable
+ * factory function to invoke for each Observer that subscribes to the output
+ * Observable. May also return a Promise, which will be converted on the fly
+ * to an Observable.
+ * @return {Observable} An Observable whose Observers' subscriptions trigger
+ * an invocation of the given Observable factory function.
+ * @static true
+ * @name defer
+ * @owner Observable
+ */
+export declare function defer<R extends ObservableInput<any> | void>(observableFactory: () => R): Observable<ObservedValueOf<R>>;