Optionalheader?: number | booleanOptionalnames?: string[]OptionalnRows?: numberOptionalnullValues?: string | string[]Optionalsheet?: string | numberSheet by name or 0-based index (default 0).
OptionalsheetName?: string | numberAlias of sheet.
OptionalskipRows?: numberOptionalusecols?: (string | number)[]Column names or indices to keep.
Header row (default 0).
false= no header.