rearrage_stuff

node_modules/rxjs/src/internal/operators/throwIfEmpty.ts

@@ -0,0 +1,60 @@
+import { EmptyError } from '../util/EmptyError';
+import { MonoTypeOperatorFunction } from '../types';
+import { operate } from '../util/lift';
+import { createOperatorSubscriber } from './OperatorSubscriber';
+
+/**
+ * If the source observable completes without emitting a value, it will emit
+ * an error. The error will be created at that time by the optional
+ * `errorFactory` argument, otherwise, the error will be {@link EmptyError}.
+ *
+ * ![](throwIfEmpty.png)
+ *
+ * ## Example
+ *
+ * Throw an error if the document wasn't clicked within 1 second
+ *
+ * ```ts
+ * import { fromEvent, takeUntil, timer, throwIfEmpty } from 'rxjs';
+ *
+ * const click$ = fromEvent(document, 'click');
+ *
+ * click$.pipe(
+ *   takeUntil(timer(1000)),
+ *   throwIfEmpty(() => new Error('The document was not clicked within 1 second'))
+ * )
+ * .subscribe({
+ *   next() {
+ *    console.log('The document was clicked');
+ *   },
+ *   error(err) {
+ *     console.error(err.message);
+ *   }
+ * });
+ * ```
+ *
+ * @param errorFactory A factory function called to produce the
+ * error to be thrown when the source observable completes without emitting a
+ * value.
+ * @return A function that returns an Observable that throws an error if the
+ * source Observable completed without emitting.
+ */
+export function throwIfEmpty<T>(errorFactory: () => any = defaultErrorFactory): MonoTypeOperatorFunction<T> {
+  return operate((source, subscriber) => {
+    let hasValue = false;
+    source.subscribe(
+      createOperatorSubscriber(
+        subscriber,
+        (value) => {
+          hasValue = true;
+          subscriber.next(value);
+        },
+        () => (hasValue ? subscriber.complete() : subscriber.error(errorFactory()))
+      )
+    );
+  });
+}
+
+function defaultErrorFactory() {
+  return new EmptyError();
+}