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  <title>isWeakMap — others</title>
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  <h1>WeakSet &amp; others</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    document.getElementById("out").textContent = [
      _.isWeakMap(new WeakSet()),
      _.isWeakMap(new Set([1])),
      _.isWeakMap(null),
      _.isWeakMap(undefined)
    ].join("\n");
  </script>
</body>
</html>

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Lodash _.isWeakMap — others (Try It)