import type { QueryClient } from '@tanstack/react-query';
/**
 * Attaches the session's stream engine as the actively viewed session.
 *
 * The engine survives release: it stays attached while the session's turn is
 * still running (so streamed chunks keep landing in the query cache during
 * session switches) and for a short retention window afterwards. Returns a
 * release function for the active viewer reference.
 */
export declare function acquireActiveSessionStream(sessionId: string, queryClient: QueryClient): () => void;
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