Need a Help on Page width only not to change page Height

//#target "InDesign";
var mainFunction = function(args) {
    var pageNum = args[0];
    var newWidth = args[1];
    var doc = app.activeDocument;
    var pageIndex = pageNum - 1;

     if (pageIndex >= 0 && pageIndex < doc.pages.length) {
        var targetPage = doc.pages[pageIndex];
        doc.documentPreferences.allowPageShuffle = false;
        var currentHeight = targetPage.bounds[2] - targetPage.bounds[0];
        targetPage.resize(
            CoordinateSpaces.INNER_COORDINATES,
            AnchorPoint.TOP_LEFT_ANCHOR,
            ResizeMethods.REPLACING_CURRENT_DIMENSIONS_WITH,
            [newWidth, currentHeight]
        );

        alert("Page " + pageNum + " resized successfully to " + newWidth.toFixed(2) + " pts.");
    } else {
        alert("Error: Page number " + pageNum + " is out of range.");
    } 
};

var showDialogAndExecute = function() {
    if (app.documents.length == 0) {
        alert("Please open an InDesign document and try again.");
        return;
    }
   
    var currentWidth = app.activeDocument.pages[0].bounds[3] - app.activeDocument.pages[0].bounds[1];
    var dialog = app.dialogs.add({name: "Resize Specific Page"});
    with(dialog.dialogColumns.add()){
        with(dialogRows.add()){
            staticTexts.add({staticLabel: "Page Number (Absolute):"});
            var pageNumberInput = integerEditboxes.add({editValue: 1}); 
        }
        with(dialogRows.add()){
            staticTexts.add({staticLabel: "New Width:"});
            //var newWidthInput = realEditboxes.add({editValue: currentWidth});
            //measurementEditbox returns measurements as points, which the transform method needs
            var newWidthInput = measurementEditboxes.add({editUnits:MeasurementUnits.INCHES, editValue:currentWidth});
        }
    }

    if (dialog.show() == true) {
        var pNum = pageNumberInput.editValue;
        var nWidth = newWidthInput.editValue;
        app.doScript(
            mainFunction, 
            ScriptLanguage.JAVASCRIPT, 
            [pNum, nWidth], 
            UndoModes.ENTIRE_SCRIPT, 
            "Resize Page"
        );
        dialog.destroy();
    } else {
        dialog.destroy();
    }
};

// Use POINTS for measurements—the transform method defaults to points
app.scriptPreferences.measurementUnit = MeasurementUnits.POINTS;
showDialogAndExecute();
app.scriptPreferences.measurementUnit = AutoEnum.AUTO_VALUE;