DocumentDeltaMimeType:
    | "application/pdf"
    | "text/csv"
    | "application/vnd.openxmlformats-officedocument.presentationml.presentation"
    | "application/vnd.ms-powerpoint"
    | "application/vnd.oasis.opendocument.presentation"
    | "application/vnd.openxmlformats-officedocument.wordprocessingml.document"
    | "application/msword"
    | "application/vnd.openxmlformats-officedocument.wordprocessingml.template"
    | "application/vnd.oasis.opendocument.text"
    | "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"
    | "application/vnd.ms-excel"
    | "application/vnd.oasis.opendocument.spreadsheet"
    | string & {}