/** Coerce a decoded MessagePack value to an object record for extension decoding. */
export declare function coerceCodecRecord(value: unknown): Record<string, unknown>;
/** Coerce a decoded MessagePack value to an array for extension decoding. */
export declare function coerceCodecArray(value: unknown): unknown[];
/** Encode a Date extension payload as float64 milliseconds since epoch. */
export declare function encodeCodecDate(value: unknown): Uint8Array | null;
/** Decode a Date extension payload from float64 milliseconds since epoch. */
export declare function decodeCodecDate(data: Uint8Array): Date;