How to avoid formula injection while keeping cell value in Javascript

How to avoid formula injection while keeping cell value in Javascript.

Is there a way to keep the value escaped in the formula editor, but show the correct value, without the leading single quote, in the cell?

I export excell and trying to avoid formula by changing the cell value.

Below is my code.

var cellValue = cell.value;
if( cellValue != null && "=-+@".indexOf(cellValue.charAt(0)) >= 0 ) {
     cell.value= "'"+cell.value;
}

Here I am trying to append single quote while exporting. But afetr export the single quote valeis still presentt in my cell.

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