/**
 * 字符相关工具
 */
export default class XString {
    static isString(s: any): boolean;
    static startsWith(s: any, c: any): any;
    static endsWith(s: any, c: any): any;
    static CutEnd(s: any, c: any): any;
    static substring(s: any, start: number, end?: number): any;
    static formatMarkDown: (val: any) => any;
    static formatJson: (str: any) => any;
    static split(a: any, s?: string): any;
    static contains(str: any, substr: any): boolean;
    static toJsonString(obj: any): any;
    static isJsonString(str: any): boolean;
    static isJsonArrayString(str: any): boolean;
    static fromJsonString(str: any): any;
    static trim(value: string): string;
    static trimExtraChar(value: string, char: string, regExp: RegExp): string;
    static formatNumber(value: string, allowDot?: boolean, allowMinus?: boolean): string;
    static pxCheck(value: string | number): string;
}
export declare const strContains: (str: any, substr: any) => boolean;
export declare const stringSplit: (a: any, s?: string) => any;
export declare function MD5(bit: any): string;
export declare function digitUppercase(n: any): string;