https://www.cem.es/core/misc/polyfills/object.assign.js?v=9.5.11

1/**
2* DO NOT EDIT THIS FILE.
3* See the following change record for more information,
4* https://www.drupal.org/node/2815083
5* @preserve
6**/
7if (typeof Object.assign !== 'function') {
8  Object.defineProperty(Object, 'assign', {
9    value: function assign(target, varArgs) {
10      'use strict';
11
12      if (target === null || target === undefined) {
13        throw new TypeError('Cannot convert undefined or null to object');
14      }
15      var to = Object(target);
16      for (var index = 1; index < arguments.length; index++) {
17        var nextSource = arguments[index];
18        if (nextSource !== null && nextSource !== undefined) {
19          for (var nextKey in nextSource) {
20            if (Object.prototype.hasOwnProperty.call(nextSource, nextKey)) {
21              to[nextKey] = nextSource[nextKey];
22            }
23          }
24        }
25      }
26      return to;
27    },
28    writable: true,
29    configurable: true
30  });
31}