/**
 * @license
 * Copyright 厦门乾元盛世科技有限公司 All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file.
 */
import { ElementRef, Renderer } from '@angular/core';
export declare class ButtonGroup {
    private _renderer;
    private _elementRef;
    /** 设置按钮大小。可选值为`large`, `small`, `default`，默认取值为`default` */
    size: string;
    /** 样式前缀 */
    prefixCls: string;
    /** 用户CSS样式 */
    class: string;
    constructor(_renderer: Renderer, _elementRef: ElementRef);
    /**
     * 最终样式
     */
    readonly classes: string;
    protected getClassNames(): string;
    readonly sizeCls: string;
}