import type { LitElement } from 'lit';
type Constructor<T = Record<string, unknown>> = new (...args: any[]) => T;
export declare class SizeMixinInterface {
    size: 's' | 'm' | 'l';
}
export declare function SizeMixin<T extends Constructor<LitElement>>(superClass: T): Constructor<SizeMixinInterface> & T;
export {};