import { Panel } from '@lumino/widgets';
export declare class StartWidget extends Panel {
    readonly BUTTON_TEXT: string;
    readonly BUTTON_TITLE: string;
    private buttonEl;
    private readonly errorWidget;
    private readonly spinnerWidget;
    constructor();
    disableButton(): void;
    enableButton(): void;
    showError(errorMessage: string): void;
    clearError(): void;
    showSpinner(): void;
    hideSpinner(): void;
    private createButton;
    private onStartClicked;
}