import { IUtils, UtilFunction } from './types';
declare class Utils implements IUtils {
    number(): (v: any) => boolean;
    isNaN(): (v: any) => boolean;
    boolean(): (v: any) => boolean;
    string(): (v: any) => boolean;
    array(): (v: any) => boolean;
    object(): (v: any) => boolean;
    bigInt(): (v: any) => boolean;
    oneof(arr: any[]): (v: any) => boolean;
    min(min: number): (v: number) => boolean;
    max(max: number): (v: number) => boolean;
    int(): (v: number) => boolean;
    positive(): (v: number) => boolean;
    negative(): (v: number) => boolean;
    id(): (v: number) => boolean;
    minLength(min: number): (v: string | typeof Array) => boolean;
    maxLength(max: number): (v: string | typeof Array) => boolean;
    toFixed(length: number): (v: number | string) => boolean;
    numeric(): (v: string) => boolean;
    useRE(re: RegExp): (v: string) => boolean;
    email(emailRE?: RegExp): (v: string) => boolean;
    phone(phoneRE?: RegExp): (v: string) => boolean;
    date(datePatterns: string[]): (v: string) => boolean;
    booleanStr(): (v: string) => v is "false" | "true";
    resetFunction(name: keyof Utils, fn: UtilFunction): void;
}
/**
* @param {*} v
* @returns {boolean} true if the value is undefined or null or NaN
*/
export declare const isEmptyValue: (v: any) => boolean;
declare const _default: Utils;
export default _default;
export declare const DEFAULT_ERROR_TEXT = "validation error";