import { PropertyValues } from 'lit';
import { SbbSelectionGroupBaseElement } from '../core/base-elements.ts';
import { SbbRadioButtonElement } from '../radio-button/radio-button.component.ts';
import { SbbRadioButtonPanelElement } from '../radio-button-panel.ts';
/**
 * It can be used as a container for radio button elements.
 *
 * @slot - Use the unnamed slot to add `sbb-radio-button`, `sbb-radio-button-panel`, `sbb-selection-action-panel` and `sbb-selection-expansion-panel` elements to the `sbb-radio-button-group`.
 * @slot error - Use this to provide a `sbb-error` to show an error message.
 * @overrideType value - (T = string) | null
 */
export declare class SbbRadioButtonGroupElement<T = string> extends SbbSelectionGroupBaseElement<SbbRadioButtonElement<T> | SbbRadioButtonPanelElement<T>> {
    static readonly elementName: string;
    static readonly role = "radiogroup";
    static readonly events: {
        readonly didChange: "didChange";
        readonly change: "change";
        readonly input: "input";
    };
    protected readonly selectionElementSelectors = "sbb-radio-button, sbb-radio-button-panel";
    protected readonly panelElementSelector: string;
    /**
     * Whether the radios can be deselected.
     */
    accessor allowEmptySelection: boolean;
    /**
     * The value of the radio group.
     */
    set value(val: T | null);
    get value(): T | null;
    /**
     * Used to preserve the `value` in case the radios are not yet 'loaded'
     */
    private _fallbackValue;
    /** Name for the group. Will be propagated to the child radio buttons. Must be unique if multiple groups are used on the same page. */
    accessor name: string;
    /** List of contained radio buttons. */
    get radioButtons(): (SbbRadioButtonElement<T> | SbbRadioButtonPanelElement<T>)[];
    constructor();
    protected willUpdate(changedProperties: PropertyValues<this>): void;
    protected firstUpdated(changedProperties: PropertyValues<this>): void;
    private _onRadioChange;
    /**
     * Proxy 'name' to child radio-buttons
     */
    private _updateRadiosName;
    /**
     * Re-trigger the setter and update the checked state of the radios.
     * Mainly used to cover cases where the setter is called before the radios are loaded
     */
    private _updateRadioState;
    protected onSlotChange(): void;
}
declare global {
    interface HTMLElementTagNameMap {
        'sbb-radio-button-group': SbbRadioButtonGroupElement;
    }
}
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