import { z, type ZodType } from "zod";
import { type Message, type Messages } from "../types";
/** Empty message payload schema */
export declare const ZodEmpty: z.ZodRecord<z.ZodString, z.ZodNever>;
/**
 * Validates payloads using `zod` schemas
 *
 * @param payload the raw payload
 * @param schema the zod schema
 * @returns the validated payload
 */
export declare const validate: <T>(payload: Readonly<T>, schema: ZodType<T>) => Readonly<T>;
/**
 * Validates message payloads from registered schemas
 *
 * @param message the message
 * @returns validated message
 */
export declare const validateMessage: <M extends Messages>(message: Message<M>) => Message<M>;
/**
 * Extends target payload with source payload after validating source
 *
 * @param source the source payload
 * @param schema the source schema
 * @param target the target payload
 * @returns the extended payload
 */
export declare const extend: <S extends Record<string, unknown>, T extends Record<string, unknown>>(source: Readonly<S>, schema: ZodType<S>, target?: Readonly<T>) => Readonly<S & T>;
//# sourceMappingURL=validation.d.ts.map