export declare class MimeTypeUtils {
    static INSTANCE: MimeTypeUtils;
    private wordExtensions;
    private excelExtensions;
    private pptExtensions;
    private fileExtensionMap;
    private csvContentType;
    private csvExtensions;
    private txtExtensions;
    private mdExtensions;
    PDF: string;
    OCTET_STREAM: string;
    constructor();
    getContentTypeForExtension(extension: string): string | null;
    getExtensionForContentType(contentType: string): string | null;
    isWordLike(contentType: string, originalExt?: string): boolean;
    isExcelLike(contentType: string, originalExt?: string): boolean;
    isCsvLike(contentType: string, originalExt?: string): boolean;
    isPowerpointLike(contentType: string, originalExt?: string): boolean;
    isTxtLike(contentType: string, originalExt?: string): boolean;
    isMdLike(contentType: string, originalExt?: string): boolean;
}