Google Docs Resize All Images

function resizeAllImages() {

//custom variable - update the desired width (in pixels)

 var newWidth = 500;

//do not edit

 var doc = DocumentApp.getActiveDocument();

 var images = doc.getBody().getImages();

 var imageCount = images.length;

 for (var i=0; i<imageCount; i++) {

   var width = images[i].getWidth();

   var height = images[i].getHeight();

   var newHeight = (newWidth / (width/height));

   images[i].setWidth(newWidth);

   images[i].setHeight(newHeight);

 }

}