import type { CanvasAgentConfig } from "./config.js";
export type RelayBridgeStatus = {
    ready: boolean;
    lastReadyAt?: string;
    lastDisconnectAt?: string;
};
export type RelayBridgeOptions = {
    relayUrl?: string;
    reconnectDelayMs?: number;
    heartbeatIntervalMs?: number;
    readyTimeoutMs?: number;
    livenessTimeoutMs?: number;
    onStatus?: (status: RelayBridgeStatus) => void;
};
/**
 * Keeps an outbound, encrypted connection to the production relay.  The canvas
 * browser can then use same-origin requests instead of directly reaching a
 * loopback HTTP address, which Chromium clients can block before CORS runs.
 */
export declare function startRelayBridge(config: CanvasAgentConfig, options?: RelayBridgeOptions): () => void;