How to get the real size of the current layer

@w30290083o9nn 

The edited canvas size of the original smart object, including transparency padding (500x500px):

Using transform, the scaled placed size, now 259px rather than the original 500px total size:

The script correctly reports the same scaled 259 total pixel size, not 500px:

I think this is code better than my previous suggestions, you were right to look at layer bounds, but not by opening the SO, just checking the bounds of the active layer. This includes transparency and includes the scaled size. So much simpler than my previous suggestions.

#target photoshop

// Get the currently selected layer
var layer = app.activeDocument.activeLayer;

// Check if the layer is a Smart Object
if (layer.kind == LayerKind.SMARTOBJECT) {
    // Get the bounds of the Smart Object layer (left, top, right, bottom)
    var layerBounds = layer.bounds;

    // Calculate the width and height of the Smart Object layer
    var layerWidth = layerBounds[2].as("px") - layerBounds[0].as("px"); // right - left
    var layerHeight = layerBounds[3].as("px") - layerBounds[1].as("px"); // bottom - top

    // Display the dimensions
    alert("Smart Object Dimensions (including transparency):\nWidth: " + layerWidth + " px" + " \nHeight: " + layerHeight + " px");
} else {
    alert("The selected layer is not a Smart Object.");
}

Is the smart object raster? If so, when you edit it - what is the canvas size?

P.S. You should also explicitly work in pixels, either directly or temporarily setting ruler units before getting the bounds, just in case the current ruler units change.