import { AbstractConstructor, Constructor } from '@mtna/common';
/** @docs-private */
export interface HasBadge {
    /** Number to show in a badge on the item. If null, no badge is shown */
    badge: number | null | undefined;
}
/** @docs-private */
export declare type HasBadgeCtor = Constructor<HasBadge> & AbstractConstructor<HasBadge>;
/** Mixin to augment a directive with a `badge` property. */
export declare function mixinBadge<T extends AbstractConstructor<{}>>(base: T): HasBadgeCtor & T;