export declare class StringUtils {
    static isString(value: unknown): value is string;
    static toRegexSource(pattern: RegExp | string): string;
    static toRegex(pattern: RegExp | string): RegExp;
    static dirname(path: string): string;
    static normalizeName(path: string, options?: {
        ext?: string;
    }): string;
    static escapeCharacters(str: string, chars?: string): string;
    private static fileNameIdx;
    private static removeLeadingSlash;
    private static removeTrailingSlash;
}