export declare class AptoGridColumnDirective {
    xs: number | string | boolean;
    sm: number | string | boolean;
    md: number | string | boolean;
    lg: number | string | boolean;
    xl: number | string | boolean;
    readonly colClass: string;
    private _getClass;
    private _parseAttribute;
}
export declare class AptoGridRowComponent {
    noGutter: boolean;
    private _noGutter;
}