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Diffstat (limited to 'node_modules/rxjs/src/internal/observable/defer.ts')
| -rw-r--r-- | node_modules/rxjs/src/internal/observable/defer.ts | 56 |
1 files changed, 0 insertions, 56 deletions
diff --git a/node_modules/rxjs/src/internal/observable/defer.ts b/node_modules/rxjs/src/internal/observable/defer.ts deleted file mode 100644 index 2bd3db9..0000000 --- a/node_modules/rxjs/src/internal/observable/defer.ts +++ /dev/null @@ -1,56 +0,0 @@ -import { Observable } from '../Observable'; -import { ObservedValueOf, ObservableInput } from '../types'; -import { innerFrom } from './innerFrom'; - -/** - * 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` allows you to create an Observable only when the Observer - * subscribes. It waits until an Observer subscribes to it, calls the given - * factory function to get an Observable -- where a factory function typically - * generates a new Observable -- and subscribes the Observer to this Observable. - * In case the factory function returns a falsy value, then EMPTY is used as - * Observable instead. Last but not least, an exception during the factory - * function call is transferred to the Observer by calling `error`. - * - * ## 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(() => { - * 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 observableFactory The Observable factory function to invoke for each - * Observer that subscribes to the output Observable. May also return any - * `ObservableInput`, which will be converted on the fly to an Observable. - * @return An Observable whose Observers' subscriptions trigger an invocation of the - * given Observable factory function. - */ -export function defer<R extends ObservableInput<any>>(observableFactory: () => R): Observable<ObservedValueOf<R>> { - return new Observable<ObservedValueOf<R>>((subscriber) => { - innerFrom(observableFactory()).subscribe(subscriber); - }); -} |
