title: Cannot find namespace 'NodeJS'
body: <p>If i run this code, i get an error,  Cannot find namespace 'NodeJS'.</p>
  
  <pre><code>  public exportExcel(jsonData: any[], excelFileName: string): void {
      //Excel Title, Header, Data
      const header: string[] =  Object.keys(jsonData[0]);
      const data = jsonData;
  
      //Create workbook and worksheet
      let workbook = new Workbook();
      let worksheet = workbook.addWorksheet(excelFileName);
  
      //Add Header Row
      let headerRow = worksheet.addRow(header);
  
      // Cell Style : Fill and Border
      headerRow.eachCell((cell, number) =&gt; {
        cell.fill = {
          type: 'pattern',
          pattern: 'solid',
          fgColor: { argb: 'FFFFFF00' },
          bgColor: { argb: 'FF0000FF' }
        }
        cell.border = { top: { style: 'thin' }, left: { style: 'thin' }, bottom: { style: 'thin' }, right: { style: 'thin' } }
      })
      // Add Data and Conditional Formatting
      data.forEach((element) =&gt; {
        let eachRow = [];
        header.forEach((headers) =&gt; {
          eachRow.push(element[headers])
        })
        if (element.isDeleted === "Y") {
          let deletedRow = worksheet.addRow(eachRow);
          deletedRow.eachCell((cell, number) =&gt; {
            cell.font = { name: 'Calibri', family: 4, size: 11, bold: false, strike: true };
          })
        } else {
          worksheet.addRow(eachRow);
        }
      })
  </code></pre>
  
  <p>...</p>
  
  <p>ERROR in node_modules/exceljs/index.d.ts(1648,34): error TS2503: Cannot find namespace 'NodeJS'.</p>