import { UUID } from "crypto";
export type SseClient = {
    id: UUID;
    send: (data: SseEvent) => void;
};
export type SseEvent = {
    type: string;
    data?: unknown;
    message?: string;
};
export type SseClientChangeEvent = {
    type: "add" | "remove";
    clientId: string;
    clientCount: number;
};
export type SseClientChangeCallback = (event: SseClientChangeEvent) => void;
export declare class SseService {
    private clients;
    private clientChangeCallbacks;
    onClientChange(callback: SseClientChangeCallback): () => void;
    private emitClientChange;
    addClient(client: SseClient): void;
    removeClient(clientId: string): void;
    notifyClients(event: SseEvent): void;
    getClientCount(): number;
}
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