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