<!DOCTYPE html>
<html>

<head>
  <meta charset="UTF-8">
  <title>JsStore Webpack Example</title>
  <script>
    if (!Array.prototype.findIndex) {
      Object.defineProperty(Array.prototype, 'findIndex', {
        value: function (predicate) {
          // 1. Let O be ? ToObject(this value).
          if (this == null) {
            throw new TypeError('"this" is null or not defined');
          }

          var o = Object(this);

          // 2. Let len be ? ToLength(? Get(O, "length")).
          var len 