use sys::io;
/// List sheet names in a workbook.
val sheets: fn(input: [bytes, Stream<'a>]) -> Result<Array<string>, [`XlsErr(string), `IOErr(string)]>;
/// Read a sheet by name as a 2D array of rows.
val read: fn(input: [bytes, Stream<'a>], sheet: string) -> Result<Array<Array<PrimNoErr>>, [`XlsErr(string), `IOErr(string)]>;