feat(datautil): big Heading feature has been added

Author: susanta96

dist/ExcelPlugin/utils/DataUtil.js

@@ -86,6 +86,17 @@ var excelSheetFromDataSet = function excelSheetFromDataSet(dataSet, bigHeading)
     }
     rowCount += ySteps;
     if (bigHeading !== null && bigHeading !== void 0 && bigHeading.title) {
+      var mergedRange = {
+        s: {
+          c: xSteps,
+          r: 0
+        },
+        e: {
+          c: dataSetItem.columns.length - 1,
+          r: 0
+        }
+      };
+      ws['!merges'] = [mergedRange];
       var cellRef = xlsx_js_style_1.utils.encode_cell({
         c: xSteps,
         r: rowCount

src-js/ExcelPlugin/utils/DataUtil.js

@@ -72,6 +72,8 @@ const excelSheetFromDataSet = (dataSet, bigHeading) => {
         }
         rowCount += ySteps;
         if (bigHeading?.title) {
+            let mergedRange = { s: { c: xSteps, r: 0 }, e: { c: dataSetItem.columns.length - 1, r: 0 } };
+            ws['!merges'] = [mergedRange];
             let cellRef = xlsx_js_style_1.utils.encode_cell({ c: xSteps, r: rowCount });
             getHeaderCell(bigHeading, cellRef, ws);
             rowCount += 1;

src/ExcelPlugin/utils/DataUtil.ts

@@ -79,6 +79,8 @@ const excelSheetFromDataSet = (dataSet: ExcelSheetData[], bigHeading?: ExcelShee
         rowCount += ySteps;
 
         if(bigHeading?.title) {
+            let mergedRange: Range = { s: { c: xSteps, r: 0 }, e: { c: dataSetItem.columns.length - 1, r: 0 } };
+            ws['!merges'] = [mergedRange];
             let cellRef = utils.encode_cell({ c: xSteps, r: rowCount });
             getHeaderCell(bigHeading, cellRef, ws);
             rowCount += 1;