import m from 'mithril';
import { Style } from '.';
export declare function isFunction(value: any): value is Function;
export declare function safeCall(func: any, ...args: any[]): any;
export declare function getClosest(el: any, selector: string): HTMLElement | null;
export declare function getScrollbarWidth(): number;
export declare function hasScrollbar(el: HTMLElement): boolean;
export declare function elementIsOrContains(element: HTMLElement, testElement: HTMLElement): boolean;
export declare function normalizeStyle(style?: Style): Object | undefined;
export declare function updateElementGroupPadding(containerEl: HTMLElement, contentLeft?: m.Vnode<any, any>, contentRight?: m.Vnode<any, any>): void;
export declare function isNullOrEmpty(item: any): boolean;