/**
 * Process-wide registry mapping a session id to a sink that delivers a local
 * file to the session's connected Telegram chat as a document. Registered by
 * the notifications extension; consumed by the telegram_send tool.
 */
/** Delivers a local file to the session's Telegram chat. */
export type TelegramFileSink = (file: {
    path: string;
    caption?: string;
    mime?: string;
}) => Promise<{
    ok: boolean;
    error?: string;
}>;
/** Register `sink` for `sessionId`. Returns a disposer that clears it. */
export declare function registerTelegramFileSink(sessionId: string, sink: TelegramFileSink): () => void;
/** The Telegram file sink for `sessionId`, if one is registered. */
export declare function getTelegramFileSink(sessionId: string): TelegramFileSink | undefined;