import type { PropertyValues, TemplateResult, CSSResultArray } from 'lit';
import { FormElement } from '../base/form-element';
/**
 * Pharos radio group component.
 *
 * @tag pharos-radio-group
 *
 * @slot legend - Contains the fieldset legend content.
 * @slot - Contains the set of radio buttons (the default slot).
 * @slot message - Contains message content to show below the group.
 *
 * @fires change - Fires when the value has changed
 */
export declare class PharosRadioGroup extends FormElement {
    /**
     * Dictate if radio buttons should be displayed horizontally
     * @attr horizontal
     */
    horizontal: boolean;
    /**
     * Indicates the selected radio for the group
     * @readonly
     */
    get value(): string;
    private _radioButtons;
    private _clicked;
    static get styles(): CSSResultArray;
    protected firstUpdated(): void;
    protected update(changedProperties: PropertyValues): void;
    private _handleKeydown;
    private _handleArrowKeys;
    private _updateSelection;
    private _setRadios;
    private _addFocusListeners;
    protected render(): TemplateResult;
}
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