import { CdkPortal } from '@angular/cdk/portal';
import * as i0 from "@angular/core";
/**
 * Secondary text of a listbox option.
 */
export declare class OptionSecondaryTextDirective {
    contentPortal?: CdkPortal;
    static ɵfac: i0.ɵɵFactoryDeclaration<OptionSecondaryTextDirective, never>;
    static ɵcmp: i0.ɵɵComponentDeclaration<OptionSecondaryTextDirective, "sp-option-secondary-text", never, {}, {}, never, ["*"], false, never>;
}