/**
 * String工具类
 */
export declare class StringUtil {
    /**
     * 文本比较
     * @param compareType "startsWith", "contains", "endsWidth", "equals", "notEquals" and "in"
     */
    static compare(source: string, target: string, compareType: string): boolean;
    /**
     * LPAD
     */
    static lpad(str: string, len: number, char: string): string;
    /**
     * 字符布尔值转布尔
     */
    static toBoolean(val: any): boolean;
}