export declare const BRIDGE_STATUS_FILE = "bridge-status.json";
export declare const BRIDGE_STATUS_HEARTBEAT_MS = 5000;
export declare const BRIDGE_STATUS_STALE_MS = 20000;
export type BridgeStatus = "connected" | "reconnecting" | "disconnected" | "unknown";
export interface BridgeStatusSnapshot {
    status: BridgeStatus;
    lastOkAt: number | null;
    lastErrorAt: number | null;
    lastError: string | null;
}
export interface BridgeStatusReader {
    snapshot(): BridgeStatusSnapshot;
}
export interface BridgeStatusWriter extends BridgeStatusReader {
    markConnected(): void;
    markDisconnected(message: string): void;
    startHeartbeat(): {
        stop(): void;
    };
}
interface ReaderOptions {
    isHermesChatRunning: () => boolean;
    now?: () => number;
    staleMs?: number;
}
interface WriterOptions {
    now?: () => number;
    heartbeatMs?: number;
}
/**
 * Read-only view used by the standalone Hermes Viewer daemon.
 *
 * The nested health `bridge` describes the Python provider ↔ Node stdio
 * transport. The Viewer daemon is a separate HTTP process, so it must never
 * refresh this file or claim that Hermes chat is connected on its own behalf.
 */
export declare function createBridgeStatusReader(statusFile: string, options: ReaderOptions): BridgeStatusReader;
/** The stdio bridge is the sole writer of Hermes transport status. */
export declare function createBridgeStatusWriter(statusFile: string, options?: WriterOptions): BridgeStatusWriter;
export {};
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