Initial project import

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

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+import { OperatorFunction } from '../types';
+import { operate } from '../util/lift';
+import { createOperatorSubscriber } from './OperatorSubscriber';
+import { noop } from '../util/noop';
+
+/**
+ * Ignores all items emitted by the source Observable and only passes calls of `complete` or `error`.
+ *
+ * ![](ignoreElements.png)
+ *
+ * The `ignoreElements` operator suppresses all items emitted by the source Observable,
+ * but allows its termination notification (either `error` or `complete`) to pass through unchanged.
+ *
+ * If you do not care about the items being emitted by an Observable, but you do want to be notified
+ * when it completes or when it terminates with an error, you can apply the `ignoreElements` operator
+ * to the Observable, which will ensure that it will never call its observers’ `next` handlers.
+ *
+ * ## Example
+ *
+ * Ignore all `next` emissions from the source
+ *
+ * ```ts
+ * import { of, ignoreElements } from 'rxjs';
+ *
+ * of('you', 'talking', 'to', 'me')
+ *   .pipe(ignoreElements())
+ *   .subscribe({
+ *     next: word => console.log(word),
+ *     error: err => console.log('error:', err),
+ *     complete: () => console.log('the end'),
+ *   });
+ *
+ * // result:
+ * // 'the end'
+ * ```
+ *
+ * @return A function that returns an empty Observable that only calls
+ * `complete` or `error`, based on which one is called by the source
+ * Observable.
+ */
+export function ignoreElements(): OperatorFunction<unknown, never> {
+  return operate((source, subscriber) => {
+    source.subscribe(createOperatorSubscriber(subscriber, noop));
+  });
+}