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## Writing Options
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The exported `write` and `writeFile` functions accept an options argument:
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| Option Name | Default | Description |
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| :---------- | -------: | :-------------------------------------------------- |
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|`type` | | Output data encoding (see Output Type below) |
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|`cellDates` | `false` | Store dates as type `d` (default is `n`) |
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|`bookSST` | `false` | Generate Shared String Table ** |
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|`bookType` | `"xlsx"` | Type of Workbook (see below for supported formats) |
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|`sheet` | `""` | Name of Worksheet for single-sheet formats ** |
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|`compression`| `false` | Use ZIP compression for ZIP-based formats ** |
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|`Props` | | Override workbook properties when writing ** |
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|`themeXLSX` | | Override theme XML when writing XLSX/XLSB/XLSM ** |
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- `bookSST` is slower and more memory intensive, but has better compatibility
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with older versions of iOS Numbers
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- The raw data is the only thing guaranteed to be saved. Features not described
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in this README may not be serialized.
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- `cellDates` only applies to XLSX output and is not guaranteed to work with
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third-party readers. Excel itself does not usually write cells with type `d`
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so non-Excel tools may ignore the data or error in the presence of dates.
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- `Props` is an object mirroring the workbook `Props` field. See the table from
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the [Workbook File Properties](#workbook-file-properties) section.
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- if specified, the string from `themeXLSX` will be saved as the primary theme
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for XLSX/XLSB/XLSM files (to `xl/theme/theme1.xml` in the ZIP)
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### Supported Output Formats
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For broad compatibility with third-party tools, this library supports many
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output formats. The specific file type is controlled with `bookType` option:
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| `bookType` | file ext | container | sheets | Description |
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| :--------- | -------: | :-------: | :----- |:------------------------------- |
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| `xlsx` | `.xlsx` | ZIP | multi | Excel 2007+ XML Format |
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| `xlsm` | `.xlsm` | ZIP | multi | Excel 2007+ Macro XML Format |
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| `xlsb` | `.xlsb` | ZIP | multi | Excel 2007+ Binary Format |
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| `biff8` | `.xls` | CFB | multi | Excel 97-2004 Workbook Format |
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| `biff5` | `.xls` | CFB | multi | Excel 5.0/95 Workbook Format |
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| `biff2` | `.xls` | none | single | Excel 2.0 Worksheet Format |
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| `xlml` | `.xls` | none | multi | Excel 2003-2004 (SpreadsheetML) |
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| `ods` | `.ods` | ZIP | multi | OpenDocument Spreadsheet |
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| `fods` | `.fods` | none | multi | Flat OpenDocument Spreadsheet |
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| `csv` | `.csv` | none | single | Comma Separated Values |
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| `txt` | `.txt` | none | single | UTF-16 Unicode Text (TXT) |
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| `sylk` | `.sylk` | none | single | Symbolic Link (SYLK) |
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| `html` | `.html` | none | single | HTML Document |
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| `dif` | `.dif` | none | single | Data Interchange Format (DIF) |
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| `dbf` | `.dbf` | none | single | dBASE II + VFP Extensions (DBF) |
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| `rtf` | `.rtf` | none | single | Rich Text Format (RTF) |
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| `prn` | `.prn` | none | single | Lotus Formatted Text |
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| `eth` | `.eth` | none | single | Ethercalc Record Format (ETH) |
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- `compression` only applies to formats with ZIP containers.
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- Formats that only support a single sheet require a `sheet` option specifying
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the worksheet. If the string is empty, the first worksheet is used.
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- `writeFile` will automatically guess the output file format based on the file
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extension if `bookType` is not specified. It will choose the first format in
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the aforementioned table that matches the extension.
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### Output Type
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The `type` argument for `write` mirrors the `type` argument for `read`:
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| `type` | output |
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|------------|-----------------------------------------------------------------|
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| `"base64"` | string: Base64 encoding of the file |
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| `"binary"` | string: binary string (byte `n` is `data.charCodeAt(n)`) |
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| `"string"` | string: JS string (characters interpreted as UTF8) |
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| `"buffer"` | nodejs Buffer |
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| `"array"` | ArrayBuffer, fallback array of 8-bit unsigned int |
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| `"file"` | string: path of file that will be created (nodejs only) |
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