import { CanDisable } from '../core/common-behaviors/disabled';
import * as i0 from "@angular/core";
export declare class Md2OptgroupBase {
}
export declare const _Md2OptgroupMixinBase: import("../core/common-behaviors/constructor").Constructor<CanDisable> & typeof Md2OptgroupBase;
/**
 * Component that is used to group instances of `md2-option`.
 */
export declare class Md2Optgroup extends _Md2OptgroupMixinBase implements CanDisable {
    /** Label for the option group. */
    label: string;
    /** Unique id for the underlying label. */
    _labelId: string;
    static ɵfac: i0.ɵɵFactoryDeclaration<Md2Optgroup, never>;
    static ɵcmp: i0.ɵɵComponentDeclaration<Md2Optgroup, "md2-optgroup", never, { "disabled": { "alias": "disabled"; "required": false; }; "label": { "alias": "label"; "required": false; }; }, {}, never, ["md2-option"], false, never>;
}