nspredicate.js

var doc = context.document;
var layer = context.selection[0]
var style = layer.style().textStyle()
var scope = context.document.currentPage().children();

selectLayersByTextStyle(style, scope)

function selectLayersByTextStyle(textStyle, scope) {
  var predicate = NSPredicate.predicateWithFormat("(style.textStyle != NULL) && (style.textStyle isEqualForSync:%@)", textStyle);

  // query page layers
  var queryResult = scope.filteredArrayUsingPredicate(predicate);

  // select all results
  doc.currentPage().selectLayers(queryResult);

  return queryResult;
}