import { LitElement } from 'lit';
export interface ButtonGroupItem {
    text: string;
    variant?: 'primary' | 'secondary' | 'outline' | 'base';
    disabled?: boolean;
    type?: 'button' | 'submit' | 'reset';
    href?: string;
    onclick?: () => void;
}
/**
 * USA Button Group Web Component
 *
 * A simple, accessible USWDS button group implementation as a custom element.
 * Uses official USWDS classes and styling with minimal custom code.
 *
 * @element usa-button-group
 *
 * @see README.mdx - Complete API documentation, usage examples, and implementation notes
 * @see CHANGELOG.mdx - Component version history and breaking changes
 * @see TESTING.mdx - Testing documentation and coverage reports
 *
 * @uswds-css-reference https://github.com/uswds/uswds/tree/develop/packages/usa-button-group/src/styles/_usa-button-group.scss
 * @uswds-docs https://designsystem.digital.gov/components/button-group/
 * @uswds-guidance https://designsystem.digital.gov/components/button-group/#guidance
 * @uswds-accessibility https://designsystem.digital.gov/components/button-group/#accessibility
 */
export declare class USAButtonGroup extends LitElement {
    static styles: import('lit').CSSResult;
    type: 'default' | 'segmented';
    buttons: ButtonGroupItem[];
    activeIndex: number;
    btnCount: number;
    private slottedContent;
    protected createRenderRoot(): HTMLElement;
    connectedCallback(): void;
    /**
     * Parse btn1-text, btn1-variant, btn2-text, etc. attributes into buttons array
     * This supports declarative HTML usage for prototyping tools
     */
    private parseButtonAttributes;
    /**
     * Detect button count from attributes if not explicitly set
     */
    private getAttributeCount;
    updated(changedProperties: Map<string, any>): void;
    private applySlottedContent;
    private handleButtonClick;
    private getButtonClasses;
    disconnectedCallback(): void;
    private renderButtonItem;
    render(): import('lit-html').TemplateResult<1>;
}
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