import type { ValidationErrors } from './ValidationException.js';
/**
 * Collection of validation error messages keyed by field.
 */
export declare class MessageBag {
    private readonly messages;
    constructor(messages: ValidationErrors);
    /**
     * All messages keyed by attribute.
     */
    all(): ValidationErrors;
    /**
     * Whether any messages exist for `key`.
     */
    has(key: string): boolean;
    /**
     * First message for `key`, or the first message in the bag when `key` is omitted.
     */
    first(key?: string): string | undefined;
    /**
     * All messages for `key` (empty array if none).
     */
    get(key: string): string[];
    /**
     * Whether the bag is empty.
     */
    isEmpty(): boolean;
}
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