import type { Messages } from '../types';
/**
 * Sanitize messages data to match the schema.
 * Stored messages might contain keys that are not in the config.
 * This happens when messages in the config were (re)moved.
 *
 * Keep exactly the keys from `shape`, fill values from `source` when present.
 * When `useSchemaDefaults` is true, missing leaves fall back to the schema value.
 * - Leaf present as string -> included
 * - Leaf missing/non-string + useSchemaDefaults -> schema value used
 * - Leaf missing/non-string + !useSchemaDefaults -> omitted
 * - Empty nested groups -> omitted (unless filled by defaults)
 */
export declare function sanitizeMessages({ config, data, useSchemaDefaults, }: {
    config: Messages;
    data: unknown;
    useSchemaDefaults?: boolean;
}): Messages;
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