/**
 * Standalone WebSocket bridge.
 *
 * Owns two ports and nothing else — it is a dumb relay with no knowledge of
 * Aseprite semantics:
 *   plugin port  : the Aseprite Lua extension dials in (at most one, last wins)
 *   control port : MCP server processes dial in (N of them)
 *
 * It runs as its own process, detached from any MCP server, because agent hosts
 * own the MCP server lifecycle and restart it freely. A bridge living inside the
 * MCP process drops the Aseprite connection on every restart and duplicate
 * processes fight over the listen port. See docs/adr/0002-standalone-bridge.md.
 *
 * Singleton by port ownership: whoever binds the control port first is the
 * bridge; a loser of the bind race exits 0 without complaint.
 */
export interface BridgeOptions {
    pluginPort?: number;
    controlPort?: number;
    version: string;
    log?: (msg: string) => void;
}
export declare class Bridge {
    private readonly pluginPort;
    private readonly controlPort;
    private readonly version;
    private readonly log;
    private pluginServer;
    private controlServer;
    private plugin;
    private hello;
    private since;
    private clients;
    private nextClientId;
    constructor(opts: BridgeOptions);
    /**
     * Bind both ports. Resolves false when the control port is already taken,
     * which means another bridge already owns this machine's Aseprite link.
     */
    start(): Promise<boolean>;
    stop(): Promise<void>;
    private onPluginConnect;
    private onPluginMessage;
    private onControlConnect;
    private onControlMessage;
    private stateFrame;
    private broadcastState;
}
export declare class BridgeBindError extends Error {
    readonly port: number;
    constructor(port: number, cause: NodeJS.ErrnoException);
}