export declare class FileUtil {
    private static regexFontType;
    private static regexFileTypeWithOptionalFingerprint;
    static normalizePath(path: string | undefined): string | undefined;
    static getFontType(font: string): string | undefined;
    static containsIndexFile(dir: string, indexFile: string): boolean;
    static getAppBuildDirs(root: string, indexFile: string): string[];
    static getFileName(file: string): string | undefined;
    static filterFonts(files: string[], include: string[] | undefined, exclude: string[] | undefined): Map<string, string>;
}