export declare const sign: (x: number) => number;
/**
 * Get value of an object property/path even if it's nested
 */
export declare function getValueByPath(obj: any, path: string): {
    [x: string]: any;
};
/**
 * Extension of indexOf method by equality function if specified
 */
export declare function indexOf(array: string | any[], obj: any, fn: (arg0: any, arg1: any) => any): number;
/**
 * Merge function to replace Object.assign with deep merging possibility
 */
/**
 * Mobile detection
 * https://www.abeautifulsite.net/detecting-mobile-devices-with-javascript
 */
export declare function removeElement(el: {
    remove: () => void;
    parentNode: {
        removeChild: (arg0: any) => void;
    };
}): void;
/**
 * Escape regex characters
 * http://stackoverflow.com/a/6969486
 */
export declare function escapeRegExpChars(value: string): string;
export declare function escapeRegExp(value: {
    source: any;
    replace: (arg0: RegExp, arg1: string) => any;
}): any;