/**
 * Check, if the string is url
 * @param candidate Candidate input, to be checked
 * @returns Is this string url?
 */
export declare const isUrl: (candidate: string) => boolean;
/**
 * Check, if the string array contain urls
 * @param candidates Candidate input array, to be checked
 * @returns Is this string array only from url?
 */
export declare const isArrayOfUrls: (candidates: string[]) => boolean;
/**
 * Check if the value in included in enum posibilities.
 * @param value Value we need to check
 * @param enumEntity Enum type we check againts the value
 * @returns Is the value in this enum?
 */
export declare const isInEnum: (value: any, enumEntity: any) => boolean;
/**
 * Sort array of string elements
 * @param rawArray Raw unsorted array of elements
 * @returns Sorted string array
 */
export declare const sortStringArray: (rawArray: string[]) => string[];
/**
 * Remove all duplicity string items from an array
 * @param arr Original array with duplicities
 * @returns Array of original values
 */
export declare const removeDuplicitiesFromArray: (arr: any[]) => any[];
/**
 * Check if the string value is not ` "" `
 * @param value Value to check
 * @returns Boolean result about the truth
 */
export declare const notEmptyString: (value: string) => boolean;
/**
 * Return enum values as array of string
 * @param enumType Type of the enum from code
 * @param separator Optional - separator character
 * @returns Array of enum possible values
 */
export declare const enumValuesToString: (enumType: any, separator?: string) => string;
/**
 * Return enum values as array of string
 * @param enumTypes Combination of enum types
 * @param separator Optional - separator character
 * @returns Array of enum possible values
 */
export declare const enumCombineValuesToString: (enumTypes: any[], separator?: string) => string;
/**
 * Return all enum values as array
 * @param enumType What array we want to work with
 * @returns Array of enum values
 */
export declare const enumValuesToArray: (enumType: any) => string[];
/**
 * Return random number (integer) between two values
 * @param min
 * @param max
 * @returns
 */
export declare const randomNumberBetween: (min: number, max: number) => number;
/**
 * Recursively flattens a nested object. The keys of the resulting object
 * will be the paths to the original values in the nested object, joined by dots.
 *
 * @param obj - The object to flatten.
 * @param prefix - The prefix to use for the keys in the flattened object. Defaults to an empty string.
 * @returns A new object with flattened keys.
 *
 * @example
 * ```typescript
 * const nestedObj = {
 *   a: {
 *     b: {
 *       c: 1
 *     }
 *   },
 *   d: 2
 * };
 * const flatObj = flattenObject(nestedObj);
 * console.log(flatObj);
 * // Output: { 'a.b.c': 1, 'a.b.d': 2 }
 * ```
 */
export declare const flattenObject: (obj: any, prefix?: string) => Record<string, any>;