sdk/pkg/template_binding/lib/js/microtask.js

/*
 * Copyright (c) 2014 The Polymer Project Authors. All rights reserved.
 * This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
 * The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
 * The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
 * Code distributed by Google as part of the polymer project is also
 * subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
 */

(function(scope) {

var iterations = 0;
var callbacks = [];
var twiddle = document.createTextNode('');

function endOfMicrotask(callback) {
  twiddle.textContent = iterations++;
  callbacks.push(callback);
}

function atEndOfMicrotask() {
  while (callbacks.length) {
    callbacks.shift()();
  }
}

new (window.MutationObserver || JsMutationObserver)(atEndOfMicrotask)
  .observe(twiddle, {characterData: true})
  ;

// exports

scope.endOfMicrotask = endOfMicrotask;

})(Platform);