/**
 * S2S Protocol Message Framing
 *
 * Message format:
 * - 3 bytes: Length prefix (total message length including flag byte, big-endian)
 * - 1 byte: Flag byte [T][CC][RRRRR]
 *   - T (bit 7): Terminal flag (1 = stream ends after this message)
 *   - CC (bits 6-5): Compression (00=none, 01=zstd, 10=gzip)
 *   - RRRRR (bits 4-0): Reserved
 * - Variable: Body (protobuf message or JSON error for terminal frames)
 */
export type CompressionType = "none" | "zstd" | "gzip";
export declare const MAX_FRAME_BYTES: number;
export declare const MAX_FRAME_PAYLOAD_BYTES: number;
export declare const MAX_DECOMPRESSED_PAYLOAD_BYTES: number;
export interface S2SFrame {
    terminal: boolean;
    compression: CompressionType;
    body: Uint8Array;
    statusCode?: number;
}
/**
 * Frame a message for s2s protocol
 */
export declare function frameMessage(opts: {
    terminal: boolean;
    compression?: CompressionType;
    body: Uint8Array;
    statusCode?: number;
}): Uint8Array;
/**
 * Parser for reading s2s frames from a stream
 */
export declare class S2SFrameParser {
    private buffer;
    /**
     * Add data to the parser buffer
     */
    push(data: Uint8Array): void;
    /**
     * Try to parse the next frame from the buffer
     * Returns null if not enough data available
     */
    parseFrame(): S2SFrame | null;
    /**
     * Check if parser has any buffered data
     */
    hasData(): boolean;
}
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