sheetjs/docbits/54_shobject.md

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#### Worksheet Object
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In addition to the base sheet keys, worksheets also add:
- `ws['!cols']`: array of column properties objects. Column widths are actually
stored in files in a normalized manner, measured in terms of the "Maximum
Digit Width" (the largest width of the rendered digits 0-9, in pixels). When
parsed, the column objects store the pixel width in the `wpx` field, character
width in the `wch` field, and the maximum digit width in the `MDW` field.
- `ws['!rows']`: array of row properties objects as explained later in the docs.
Each row object encodes properties including row height and visibility.
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- `ws['!merges']`: array of range objects corresponding to the merged cells in
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the worksheet. Plain text formats do not support merge cells. CSV export
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will write all cells in the merge range if they exist, so be sure that only
the first cell (upper-left) in the range is set.
- `ws['!protect']`: object of write sheet protection properties. The `password`
key specifies the password for formats that support password-protected sheets
(XLSX/XLSB/XLS). The writer uses the XOR obfuscation method. The following
keys control the sheet protection -- set to `false` to enable a feature when
sheet is locked or set to `true` to disable a feature:
<details>
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<summary><b>Worksheet Protection Details</b> (click to show)</summary>
| key | feature (true=disabled / false=enabled) | default |
|:----------------------|:----------------------------------------|:-----------|
| `selectLockedCells` | Select locked cells | enabled |
| `selectUnlockedCells` | Select unlocked cells | enabled |
| `formatCells` | Format cells | disabled |
| `formatColumns` | Format columns | disabled |
| `formatRows` | Format rows | disabled |
| `insertColumns` | Insert columns | disabled |
| `insertRows` | Insert rows | disabled |
| `insertHyperlinks` | Insert hyperlinks | disabled |
| `deleteColumns` | Delete columns | disabled |
| `deleteRows` | Delete rows | disabled |
| `sort` | Sort | disabled |
| `autoFilter` | Filter | disabled |
| `pivotTables` | Use PivotTable reports | disabled |
| `objects` | Edit objects | enabled |
| `scenarios` | Edit scenarios | enabled |
</details>
- `ws['!autofilter']`: AutoFilter object following the schema:
```typescript
type AutoFilter = {
ref:string; // A-1 based range representing the AutoFilter table range
}
```
#### Chartsheet Object
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Chartsheets are represented as standard sheets. They are distinguished with the
`!type` property set to `"chart"`.
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The underlying data and `!ref` refer to the cached data in the chartsheet. The
first row of the chartsheet is the underlying header.