Creates a New Layer within a pre-processing script

psNewLayer.jsx

function psNewLayer(layerName,vis,lock,showHide){
    //"HdAl" - Hides; "RvlA" - Reveal All; "RvlS" - Reveal Selection  
    
    var doc = app.activeDocument;    
    
    if(app.activeDocument.activeLayer.isBackgroundLayer){
        app.activeDocument.activeLayer.name = layerName; //variable must be string 
    } else {
        doc.artLayers.add().name = layerName; //variable must be string 
    }

    if(!showHide)  {showHide=null} else {psNewMask(showHide,layerName);}    
    if(vis==false) {doc.layers.getByName(layerName).visible = vis} else {lock=null;}
    if(!lock)      {lock=null} else {doc.layers.getByName(layerName).allLocked = lock;}        
}