How do I know if spreadsheet cells are merged using google apps script

Question

In a Google docs spreadsheet. If cells A1 & A2 are merged, is there a way to confirm they are merged, using google apps script?

There is a merge function in GAS

Answer 1

There seems to be a workaround exploiting the fact that merged cells always return a white background. The code below appears to work for me; I will appreciate it if anyone can confirm.

function testMerged() {
  var WHITE = '#ffffff';
  var NON_WHITE = '#fffffe';
  var range = SpreadsheetApp.getActiveSheet().getDataRange();
  range.setBackground(NON_WHITE);
  range.getBackgrounds().forEach(function (row, rowNum) {
    row.forEach(function (col, colNum) {
      if (col === WHITE) { Logger.log('Cell merged at row ' + rowNum + ' col ' + colNum); }
    });
  });
  range.setBackground(WHITE);  
}