Illustrator Script: Convert Groups under selected to Layers

Convert Groups To Layers.jsx

// Save to... /Applications/Adobe Illustrator CC/Presets.localized/<LOCALE>/Scripts/
// Polyfill for forEach
function forEach(array, fn, scope) {
  scope = scope || array;
  // array is cloned in order to allow mutations
  // in `fn` but not suffer from them, so iteration
  // keeps normally.
  array = Array.prototype.slice.call(array,0);

  for(var i = 0, len = array.length; i < len; i++) {
    fn.call(scope, array[i], i, array);
  }
}

function convertGroupToLayer(item) {
  var newLayer = app.activeDocument.layers.add(); // creates a new layer
  newLayer.name = item.name; // rename layer same as group

  forEach(item.pageItems, function(el) {
    el.move(newLayer,ElementPlacement.PLACEATEND); // move group to new layer
  });

  newLayer.move(item, ElementPlacement.PLACEBEFORE);
  item.remove();
}

// forEach pageItem of activeLayer, convertGroupToLayer
forEach(app.activeDocument.activeLayer.groupItems, convertGroupToLayer);