/**
 * Stateless SSE formatting utilities per the Server-Sent Events standard.
 * Used by the Streamable HTTP transport for MCP.
 */
export declare function formatSSEEvent(data: unknown, id?: string): string;
/** Formats sseretry. */
export declare function formatSSERetry(ms: number): string;
/** Format an SSE priming event. */
export declare function formatSSEPrimingEvent(id: string): string;
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