wpj.onReady = {
   callbacks: wpj.onReady ?? [],
   processed: false,
   push: function(callback) {
      wpj.onReady.callbacks.push(callback);

      if (wpj.onReady.processed) {
         wpj.onReady.process();
      }
   },
   processAll: function() {
      wpj.onReady.processed = true;

      wpj.onReady.process();
   },
   process: function() {
      var callback;
      while ((callback = wpj.onReady.callbacks.shift())) {
         callback();
      }
   }
};