Where can I find the numeric list of layerKind?

I have this function which get some layers data and then do some stuff. If you see at line 24, there is an if condition "if (lyr.type == layerType" and for example, if I want to choose shape layers I have to put the number 4 using a prompt. My question is, where does this number come from? Why 4? What is 3 or 5? Where can I find a list of what is what?

Thank you for your time!!!

function getLayersData()
    {
        var lyrs = [];
        var layers = 1;
        while (true)
        {
            ref = new ActionReference();
            ref.putIndex(charIDToTypeID('Lyr '), layers);
            
            try 
            {
                var desc = executeActionGet(ref);
            } 
            catch (err)
            {
                break;                
            }
            
            var lyr = {};
            lyr.type = desc.getInteger(stringIDToTypeID("layerKind"));
            lyr.name = desc.getString(charIDToTypeID("Nm  "));
            lyr.id = desc.getInteger(stringIDToTypeID("layerID"));
            
            if (lyr.type == layerType && lyr.name.match(layerName))
            {
                var adj = desc.getList(stringIDToTypeID("adjustment")).getObjectValue(0);
                if (adj.hasKey(stringIDToTypeID("color"))) 
                {
                    var curColor = new SolidColor();
                    curColor.rgb.red = adj.getObjectValue(stringIDToTypeID("color")).getUnitDoubleValue(stringIDToTypeID("red"));
                    curColor.rgb.green = adj.getObjectValue(stringIDToTypeID("color")).getUnitDoubleValue(stringIDToTypeID("grain"));
                    curColor.rgb.blue = adj.getObjectValue(stringIDToTypeID("color")).getUnitDoubleValue(stringIDToTypeID("blue"));
                    lyr.color = curColor; 
                    if (lyr.color.rgb.hexValue == currentColor[0])
                    {
                        lyrs.push(lyr);                                        
                    }                      
                }                
            }
            layers++;            
        }
        return lyrs        
    };