import { LitElement } from 'lit';
import type StepperBar from '../stepper-bar/stepper-bar';
import type StepperPanel from '../stepper-panel/stepper-panel';
import type StepperStep from '../stepper-step/stepper-step';
export declare class StepperGroupBase extends LitElement {
    stepperBar: StepperBar | undefined;
    stepperPanels: StepperPanel[];
    incompleteSteps: StepperStep[];
    activatePanel(index: number): void;
    protected firstUpdated(): void;
    nextStep(): void;
    previousStep(): void;
    completeActiveStep(): void;
    render(): import("lit-html").TemplateResult<1>;
}