export declare const PAYLOAD_MAGIC: Buffer<ArrayBuffer>;
export declare const PAYLOAD_ENVELOPE_VERSION = 1;
export declare const PAYLOAD_CODEC_NAME = "memoflow-portable-json";
export declare const PAYLOAD_CODEC_VERSION = 1;
export declare const PAYLOAD_CONTENT_TYPE = "application/vnd.memoflow.portable-json.v1+json";
export declare const MAX_PAYLOAD_BODY_BYTES: number;
export declare const MAX_PAYLOAD_METADATA_BYTES: number;
export declare const MAX_PAYLOAD_METADATA_ENTRIES = 32;
export declare const PORTABLE_UNDEFINED: unique symbol;
export declare function encodePortablePayload(value: unknown, metadata?: Record<string, string>): Buffer;
export declare function isPortableEnvelope(bytes: Buffer | Uint8Array): boolean;
export declare function decodePortablePayload(bytes: Buffer | Uint8Array): unknown;