import type { TextareaFieldConfig } from './field-config.js';
import type { ManagedFieldController } from './managed-field-controller.js';
/**
 * Creates a multiline string controller.
 *
 * @param config - Textarea configuration.
 * @param fieldId - Instance-scoped control identifier.
 * @param invalidMessage - Validation fallback.
 * @param onUserChange - Form-owned change notification.
 * @returns Managed field controller.
 */
export declare function createTextareaFieldController<TFormValues extends object>(config: TextareaFieldConfig<TFormValues>, fieldId: string, invalidMessage: string, requiredMessage: string, onUserChange: () => void): ManagedFieldController<TFormValues>;