/** Build the WebSocket stream URL from the HTTP base. http→ws, https→wss. The
 *  token rides the query string because browsers can't set an Authorization
 *  header on a WebSocket handshake; the server authenticates it the same way it
 *  authenticates the SSE `?cursor=` stream. `cursor` resumes after a reconnect,
 *  mirroring the SSE plane. */
export declare function deriveWsStreamUrl(baseUrl: string, sessionId: string, token: string, cursor?: number): string;
/** Normalize an incoming WS message into the `{ event, data }` shape the SSE
 *  frame handler already consumes, so both transports converge on one code
 *  path. Accepts two wire forms:
 *    1. a framed message: { "event": "...", "data": "<json string>" }
 *    2. a bare envelope:  { "type": "...", ... }  → event defaults to "message"
 *  Returns null for anything unparseable (the caller drops it). */
export declare function decodeWsMessage(raw: string): {
    event: string;
    data: string;
} | null;
/** Frame an outbound user-input message for the WS plane (for hosts that also
 *  accept input over the socket). Mirrors the REST `/input` body. */
export declare function encodeWsInput(text: string, opts?: {
    image?: string;
}): string;
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