getLayerKindByID.jsx

function getLayerKindByID(id){
  var ref, desc, adjustmentDesc, layerSectionType;
  ref = new ActionReference();
  ref.putIdentifier(charIDToTypeID("Lyr "), id);
  desc = executeActionGet(ref);
  var layerType = typeIDToStringID(desc.getEnumerationValue(stringIDToTypeID('layerSection')));
  if(layerType != 'layerSectionContent') return;
  if(desc.hasKey(stringIDToTypeID('textKey'))) return LayerKind.TEXT;
  if(desc.hasKey(stringIDToTypeID('smartObject'))) return LayerKind.SMARTOBJECT;
  if(desc.hasKey(stringIDToTypeID('layer3D'))) return LayerKind.LAYER3D;
  if(desc.hasKey(stringIDToTypeID('adjustment'))){
    switch(typeIDToStringID(desc.getList(stringIDToTypeID('adjustment')).getClass(0))){
      case 'photoFilter' : return LayerKind.PHOTOFILTER;
      case 'solidColorLayer' : return LayerKind.SOLIDFILL;
      case 'gradientMapClass' : return LayerKind.GRADIENTMAP;
      case 'gradientMapLayer' : return LayerKind.GRADIENTFILL;
      case 'hueSaturation' : return LayerKind.HUESATURATION;
      case 'colorLookup' : return;
      case 'colorBalance' : return LayerKind.COLORBALANCE;
      case 'patternLayer' : return LayerKind.PATTERNFILL;
      case 'invert' : return LayerKind.INVERSION;
      case 'posterization' : return LayerKind.POSTERIZE;
      case 'thresholdClassEvent' : return LayerKind.THRESHOLD;
      case 'blackAndWhite' : return LayerKind.BLACKANDWHITE;
      case 'selectiveColor' : return LayerKind.SELECTIVECOLOR;
      case 'vibrance' : return LayerKind.VIBRANCE;
      case 'brightnessEvent' : return LayerKind.BRIGHTNESSCONTRAST;
      case 'channelMixer' : return LayerKind.CHANNELMIXER;
      case 'curves' : return LayerKind.CURVES;
      case 'exposure' : return LayerKind.EXPOSURE;
      default : return typeIDToStringID(desc.getList(stringIDToTypeID('adjustment')).getClass(0));
    }
  }
  return LayerKind.NORMAL;
};