import { WebSocket } from 'ws';
import type { TuiFrame } from '../../tui/protocol.js';
export declare class TuiConnection {
    readonly conduitId: string;
    readonly ws: WebSocket;
    activeSessionId: string | null;
    activeProjectId: string;
    uiSubscriptions: Set<string>;
    /** Active UiService subscription handles — closed on cleanup */
    activeSubscriptions: Map<string, {
        close(): void;
    }>;
    /** pending actions keyed by action id (triggerId suffix) */
    pendingActions: Map<string, {
        actionId: string;
        value: string;
    }>;
    /** pending modal acks keyed by modal submit id */
    pendingModalAcks: Map<string, {
        callbackId: string;
    }>;
    private _closed;
    constructor(conduitId: string, ws: WebSocket, projectId: string);
    /** Encode and send a TuiFrame over the WebSocket. No-op if already closed. */
    send(frame: TuiFrame): void;
    /** Close the WebSocket connection with an optional close code and reason. */
    close(code?: number, reason?: string): void;
    /** True if the connection has been closed. */
    get closed(): boolean;
}