export declare class SongFormatConverter {
    private static GetFirstVisibleChar;
    static FromACF1ToACF2(data: string): {
        value: string | null;
        error: string | null;
    };
    static FromACF2ToACF1(data: string): {
        value: string | null;
        error: string | null;
    };
    static FromACF1FileToACF2File(inFilePath: string, outFilePath: string): Promise<{
        ok: boolean;
        error: string | null;
    }>;
}