export declare function isElementInToolbar(el: EventTarget | null): boolean;
export declare function isElementNode(el: Node | Element | undefined | null): el is Element;
export declare function isTag(el: Element | undefined | null, tag: string): el is HTMLElement;
export declare function isTextNode(el: Element | undefined | null): el is HTMLElement;
export declare function isShadowRoot(el: Node | ParentNode | undefined | null): el is ShadowRoot;