import { LitElement } from 'lit-element';
import type { PropertyValues } from 'lit-element';
declare global {
    interface HTMLElementTagNameMap {
        'vwc-button-toggle-group': VWCButtonToggleGroup;
    }
}
export declare const VALID_BUTTON_ELEMENTS: string[];
export declare class VWCButtonToggleGroup extends LitElement {
    #private;
    multi: boolean;
    enlarged: boolean;
    dense: boolean;
    required: boolean;
    disabled: boolean;
    constructor();
    get items(): Element[];
    get selected(): Element[];
    get values(): (string | false | null)[];
    set values(values: (string | false | null)[]);
    private get size();
    protected updated(changes: Map<string, boolean>): void;
    protected firstUpdated(_changedProperties: PropertyValues): void;
    protected render(): unknown;
    private toggleChildrenDisabledState;
    private toggleChildDisabledState;
    private setNodesAndClickEvents;
    private isButtonValidForToggle;
    private setNodeAndClickEvent;
    private handleButtonClick;
    private setNodeAttributes;
    private toggleButtonSelectedState;
    private setVwcButtonSize;
    private clearSelection;
    private dispatchToggleEvent;
}