import { SbbElement } from '../core/base-elements/element.ts';
import { AbstractConstructor } from '../core/mixins/constructor.ts';
export declare class SbbTrainFormationOrientationMixinType {
    protected readonly orientation: 'horizontal' | 'vertical' | null;
}
/**
 * Mixin that reads the `orientation` property from the closest `sbb-train-formation`
 * and reflects it as a CSS custom state (`orientation-horizontal` / `orientation-vertical`).
 */
export declare const SbbTrainFormationOrientationMixin: <T extends AbstractConstructor<SbbElement>>(superClass: T) => AbstractConstructor<SbbTrainFormationOrientationMixinType> & T;
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