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node_modules/rxjs/dist/esm/internal/operators/single.js

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+import { EmptyError } from '../util/EmptyError';
+import { SequenceError } from '../util/SequenceError';
+import { NotFoundError } from '../util/NotFoundError';
+import { operate } from '../util/lift';
+import { createOperatorSubscriber } from './OperatorSubscriber';
+export function single(predicate) {
+    return operate((source, subscriber) => {
+        let hasValue = false;
+        let singleValue;
+        let seenValue = false;
+        let index = 0;
+        source.subscribe(createOperatorSubscriber(subscriber, (value) => {
+            seenValue = true;
+            if (!predicate || predicate(value, index++, source)) {
+                hasValue && subscriber.error(new SequenceError('Too many matching values'));
+                hasValue = true;
+                singleValue = value;
+            }
+        }, () => {
+            if (hasValue) {
+                subscriber.next(singleValue);
+                subscriber.complete();
+            }
+            else {
+                subscriber.error(seenValue ? new NotFoundError('No matching values') : new EmptyError());
+            }
+        }));
+    });
+}
+//# sourceMappingURL=single.js.map