/**
 * Codec for ECHO objects in feed block payload: JSON object ↔ UTF-8 bytes.
 * Encodes with queue position stripped; decodes with optional position injection.
 */
export declare class EchoFeedCodec {
    #private;
    /**
     * Prepares a value for feed storage (strips queue position from metadata) and encodes to bytes.
     */
    static encode(value: Record<string, unknown>): Uint8Array;
    /**
     * Decodes feed block bytes to a JSON value.
     * If position is provided, injects queue position into the decoded object's metadata.
     */
    static decode(data: Uint8Array, position?: number): Record<string, unknown>;
}
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