import type { Request, Response } from 'express';
export interface ClientConnectionState {
    disconnected: boolean;
}
export declare const CLIENT_CONNECTION_STATE_FIELD = "__clientConnectionState";
export declare function trackClientConnectionState(req: Request, res: Response): ClientConnectionState;
export declare function extractClientConnectionState(metadata?: Record<string, unknown>): ClientConnectionState | undefined;
export declare function getClientConnectionAbortSignal(source?: ClientConnectionState | Record<string, unknown>): AbortSignal | undefined;
export declare function applyClientConnectionStateToContext(metadata: Record<string, unknown> | undefined, adapterContext: Record<string, unknown>): void;