import { ILogger } from '@microsoft/teams.common';
import { ISocketConnection, SocketConnectionContext, SocketConnectionHandlers } from './types';
/**
 * A `@microsoft/signalr`-backed {@link ISocketConnection}. Negotiates through
 * Teams backend service, opens the Azure SignalR socket, and does not resolve {@link start} until
 * the Teams backend service `SocketReady` readiness frame arrives (or the readiness timeout
 * elapses).
 *
 * Returning a value from the `Activity` handler is what drives SignalR client
 * results: Teams backend service awaits the returned reply frame as the invocation result.
 */
export declare class SignalRSocketConnection implements ISocketConnection {
    private readonly context;
    private readonly handlers;
    private readonly log?;
    /** Access-token lifetime from the negotiate response; drives proactive refresh. */
    expiresInSeconds?: number;
    /** Local token-expiry deadline; see {@link ISocketConnection.expiresAtMs}. */
    expiresAtMs?: number;
    /** This socket's server identity; see {@link ISocketConnection.connectionId}. */
    connectionId?: string;
    private connection?;
    private stopped;
    /**
     * Whether the readiness gate has been settled (resolved or rejected). Guards
     * the `SocketReady` handler so a duplicate or late readiness frame — including
     * one that arrives after {@link stop} — cannot re-fire `onReady` or otherwise
     * act on an already-settled connection.
     */
    private settled;
    constructor(context: SocketConnectionContext, handlers: SocketConnectionHandlers, log?: ILogger | undefined);
    /** Whether SignalR is connected and stopping has not begun. */
    get isOpen(): boolean;
    start(signal?: AbortSignal): Promise<void>;
    stop(): Promise<void>;
    private throwIfAborted;
    /**
     * Bridge the SignalR client's internal diagnostics into the app's
     * {@link ILogger} so they surface through the SDK's logging pipeline (and
     * respect its configured level) instead of SignalR's default console logger.
     */
    private signalRLogger;
}