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  <title>Lodash isNull vs isNil</title>
</head>
<body>
  <h1>_.isNull vs _.isNil on undefined</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    (function () {
      document.getElementById("out").textContent =
        "isNullUndef: " + _.isNull(undefined) + "\n" +
        "isNilUndef: " + _.isNil(undefined);
    })();
  </script>
</body>
</html>

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Lodash _.isNull vs _.isNil (Try It)