import { Playground } from '../state/playground';
import { LitElement } from 'lit-element';
import '@material/mwc-button';
declare const ImportExport_base: {
    new (...args: any[]): import("../blackboard/blackboard-connect").PinnedElement<Playground> & LitElement & import("lit-element").Constructor<LitElement>;
    prototype: any;
};
export declare class ImportExport extends ImportExport_base {
    private fileUpload;
    import(): void;
    export(): void;
    render(): import("lit-element").TemplateResult;
}
export {};