export declare type NtButtonStyle = '' | 'hollow' | 'clear';
export declare class NtButtonComponent {
    private _style;
    private _expanded;
    class: string;
    color: string;
    size: string;
    set button(value: NtButtonStyle);
    set style(value: NtButtonStyle);
    get style(): NtButtonStyle;
    set expanded(value: boolean);
    get expanded(): boolean;
    private _validStyle;
}
