sync.js

var loadTypography = function (newStyles, sharedStyles) {

  var alignmentHash = {
    'left': 0,
    'right': 1,
    'center': 2,
    'justified': 3
  };

  // removeAllStyles();

  for(var i=0; i<newStyles.length; i++) {
    createStyle(newStyles[i]);
  }

  function createStyle(style) {
    if(style.Style == "") { return; }

    var textLayer = [[MSTextLayer alloc] initWithFrame:nil];

    if("Size"      in style)  { textLayer.setFontSize(style.Size); }
    if("Line"      in style)  { textLayer.setLineSpacing(style.Line); }
    if("Character" in style)  { textLayer.setCharacterSpacing(style.Character); }
    if("Alignment" in style)  { textLayer.setTextAlignment(alignmentHash[style.Alignment]); }
    if("Typeface"  in style)  { textLayer.setFontPostscriptName(style.Typeface); }
    if("Color"     in style)  {
      var color = MSColor.colorWithSVGString("#" + style.Color);
      color.alpha = style.Opacity;
      textLayer.setTextColor(color);
    }

    updateStyles(textLayer, style.Style);

  }

  function updateStyles(obj, name) {
    log(obj.style().sharedObjectID());
    var sharedStylesPredicate = NSPredicate.predicateWithFormat("objectID == %@", obj.style().sharedObjectID());
    var sharedStyle = sharedStyles.objects().array().filteredArrayUsingPredicate(sharedStylesPredicate).firstObject();

    if(sharedStyle) {
      log('updating');
      sharedStyles.synchroniseInstancesOfSharedObject_withInstance(sharedStyle, obj.style())
    } else {
      log('creating');
      sharedStyles.addSharedStyleWithName_firstInstance(name, obj.style());
    }

    // doc.reloadInspector();
  }

  function removeAllStyles() {
    var existingStyles = sharedStyles.objects();

    while(existingStyles.count() > 0) {
      style = existingStyles.objectAtIndex(0);
      [existingStyles removeObject:style];
    }
  }
}