https://co-growth.jp/wp/wp-content/plugins/qa-heatmap-analytics/js/polyfill/object_assign.js?ver=4.1.2.1

1if (!Object.assign) {
2  Object.defineProperty(Object, 'assign', {
3    enumerable: false,
4    configurable: true,
5    writable: true,
6    value: function(target) {
7      'use strict';
8      if (target === undefined || target === null) {
9        throw new TypeError('Cannot convert first argument to object');
10      }
11
12      var to = Object(target);
13      for (var i = 1; i < arguments.length; i++) {
14        var nextSource = arguments[i];
15        if (nextSource === undefined || nextSource === null) {
16          continue;
17        }
18        nextSource = Object(nextSource);
19
20        var keysArray = Object.keys(Object(nextSource));
21        for (var nextIndex = 0, len = keysArray.length; nextIndex < len; nextIndex++) {
22          var nextKey = keysArray[nextIndex];
23          var desc = Object.getOwnPropertyDescriptor(nextSource, nextKey);
24          if (desc !== undefined && desc.enumerable) {
25            to[nextKey] = nextSource[nextKey];
26          }
27        }
28      }
29      return to;
30    }
31  });
32}