import type { FastifyReply } from "fastify";
import type { z } from "zod";
/**
 * Parse and validate a request body against a zod schema.
 * On success, returns the parsed (and transformed) data.
 * On failure, sends a 400 response with structured field errors and returns null.
 */
export declare function validateBody<T extends z.ZodType>(body: unknown, schema: T, reply: FastifyReply): z.infer<T> | null;
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