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node_modules/rxjs/internal/util/canReportError.d.ts

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+import { Subscriber } from '../Subscriber';
+import { Subject } from '../Subject';
+/**
+ * Determines whether the ErrorObserver is closed or stopped or has a
+ * destination that is closed or stopped - in which case errors will
+ * need to be reported via a different mechanism.
+ * @param observer the observer
+ */
+export declare function canReportError(observer: Subscriber<any> | Subject<any>): boolean;