import type { MessageMap } from './MessageMap.js';
/**
 * Nested messages per field: `{ email: { required: "...", email: "..." } }`.
 */
export type NestedMessageMap = Record<string, Record<string, string>>;
/**
 * Custom messages: flat `attribute.rule` entries and/or nested per-field rule maps.
 */
export type ValidationMessages = MessageMap | NestedMessageMap;
/**
 * Normalize to flat `attribute.rule` keys for the validation engine.
 */
export declare function toFlatMessages(messages?: ValidationMessages): MessageMap;
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