[Q] Problem with "Implicit intersection operator: @"

I’m creating a simple sheet which includes an Excel array formula: SUM( ROUND( D1:D3, 0 )) With this code (ExcelJS 4.1.1):

     const workbook = new Excel.Workbook();
     const worksheet = workbook.addWorksheet( 'test_sheet' );
     worksheet.getCell( 'D1:D1' ).value = 1.2;
     worksheet.getCell( 'D2:D2' ).value = 2.3;
     worksheet.getCell( 'D3:D3' ).value = 5.6;
     worksheet.getCell( 'D4:D4' ).value = {
         formula: "SUM(ROUND(D1:D3, 0))",
         result: 0,
         date1904: false,
     };
     await workbook.xlsx.writeFile( "c:\\temp\\test.xlsx" );

When I open this sheet with Excel (Excel for Microsoft 365 MSO (16.0.13127.20266)) the new “Implicit intersection operator” will be inserted into the formula and breaks it:

Now I have to remove the inserted “@” and the formula works:

Has anybody a solution or workaround for this problem?

[matteralus]

I had the same issue with XLOOKUP. Entered a “good” version of formula in Excel and saved it. Read the file back through exceljs and the formula printed as “_xlfn.XLOOKUP”. When I specify the formula this way for exceljs it ends up avoiding putting the @ in Excel and the _xlfn is dropped by the time I look at it in Excel (and the formula works!). Same trick seems to work with CONCAT

[huberdo]

The above solution worked in some cases, but for UNIQUE I had to also set a few other value properties. Putting “shareType” to “array” and providing “ref” did the trick. Mostly just commenting in case anyone else has similar issues with that function.

When I try to set the “shareType” to “array” I get: Type ‘{ formula: string; result: number; shareType: string; ref: string; }’ is not assignable to type ‘CellValue’. Object literal may only specify known properties, and ‘shareType’ does not exist in type ‘Date | CellErrorValue | CellRichTextValue | CellHyperlinkValue | CellFormulaValue | CellSharedFormulaValue’.ts(2322)

Any ideas why (in TypeScript) shareType is not accessible?

Thank you for your help!