Photoshop layer color label changer

ToggleColorLabel.jsx

// Toggle Color Label
//
// ABOUT
//   Change color label.
//   None → Red → Orange → Yellow → Green 
//     → Blue → Violet → Gray → None
//
// LICENSE
//   Copyright (c) 2021 twitter:@pik
//   Released under the MIT license
//   http://opensource.org/licenses/mit-license.php
//
// HISTORY
//   2021/05/06  1.00  Release.
//

/*
<javascriptresource>
  <name>色ラベルの変更 / Toggle Color Label</name>
  <about>
    Toggle Color Label
    Version 1.00
    Copyright (c) 2021 @pik.
  </about>
</javascriptresource>
*/

#target photoshop

$.level = 0;
$.localize = true;

const msgErrBackground = {
  en: "Color labels cannot be set for the background layer", 
  ja: "背景レイヤーには色ラベルを設定できません"
};

(function(){
try 
{
  var doc = app.activeDocument;
  if (doc.activeLayer.isBackgroundLayer)
  {
    alert(msgErrBackground);
    return;
  }
} 
catch(e) 
{
  return;
}

const colors = [
  "none",
  "red" ,
  "orange",
  "yellowColor",
  "grain",
  "blue" ,
  "violet",
  "gray",
];

try
{
  // 現在のカラーラベルの取得
  var ref = new ActionReference();
  ref.putEnumerated(
    charIDToTypeID("Lyr "), // Layer
    charIDToTypeID("Ordn"), // Ordinal
    charIDToTypeID("Trgt")  // TargetEnum
  );

  var desc = executeActionGet(ref);
  var curColor = 
    typeIDToStringID(desc.getEnumerationValue(stringIDToTypeID('color')));

  // 設定するカラーラベルの取得
  var index = 0;
  var len = colors.length;
  for (var i = 0; i < colors.length; i++)
  {
    if (curColor == colors[i])
    {
      index = i + 1;
      break;
    }
  }

  if (index == len)
    index = 0;

  var newColor = colors[index];

  // カラーラベルの設定
  var descColor = new ActionDescriptor();
  descColor.putEnumerated( 
    charIDToTypeID('Clr '), // Color
    charIDToTypeID('Clr '), // Color
    stringIDToTypeID(newColor)
  );

  var target = new ActionDescriptor();
  target.putReference(charIDToTypeID('null'), ref);
  target.putObject( 
    charIDToTypeID('T   '), // To
    charIDToTypeID('Lyr '), // Layer
    descColor 
  );

  executeAction(charIDToTypeID('setd'), target, DialogModes.NO);
}
catch (e)
{
  alert(e.message);
}
})();