import { type FederationEnvelope, type MessageKind, type StreamFrame } from './types.js';
export declare function newId(): string;
export declare function envelope<T>(kind: MessageKind, from: string, data?: T, opts?: {
    to?: string;
    re?: string;
    id?: string;
    auth?: string;
}): FederationEnvelope<T>;
/** Build a reply envelope correlated to a request. */
export declare function reply<T>(to: FederationEnvelope, kind: MessageKind, from: string, data?: T): FederationEnvelope<T>;
export declare function nextSeq(): number;
export declare function frame(t: StreamFrame['t'], from: string, d?: unknown): StreamFrame;
/** Serialize a frame as an SSE `data:` block. Event name = frame type for
 *  per-type handling on the harness side. */
export declare function frameToSSE(f: StreamFrame): string;
/** Parse a raw SSE chunk buffer into complete frames. Returns leftover text. */
export declare function parseSSE(buffer: string): {
    frames: StreamFrame[];
    rest: string;
};