export declare class SyncButton extends HTMLElement {
    static observedAttributes: string[];
    private shadowButton;
    private slotEl;
    private send;
    private exitRoom;
    constructor();
    broadcast(payload: string): void;
    connectedCallback(): void;
    disconnectedCallback(): void;
    attributeChangedCallback(_name: string, _oldValue: string | null, _newValue: string | null): void;
    get disabled(): boolean;
    set disabled(value: boolean);
    focus(options?: FocusOptions): void;
    click(): void;
    private syncToInnerButton;
    private upgradeProperty;
    private onMessage;
    private onClickButton;
}
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