/**
 * CDR encode/decode for ROS 2 messages over Zenoh (rmw_zenoh uses CDR payloads).
 * Supports geometry_msgs/msg/Twist, sensor_msgs/msg/Image, sensor_msgs/msg/CompressedImage.
 */
/**
 * Encode a ROS 2 message to CDR (little-endian) for the given type.
 * Supports: geometry_msgs/msg/Twist.
 */
export declare function encodeCdr(typeStr: string, msg: Record<string, unknown>): Uint8Array;
/**
 * Decode a CDR payload to a plain object for the given type.
 * Supports: geometry_msgs/msg/Twist.
 */
export declare function decodeCdr(typeStr: string, data: Uint8Array): Record<string, unknown>;
/** Check if we can encode/decode the given type. */
export declare function isCdrTypeSupported(typeStr: string): boolean;
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