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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>defaultsDeep — null</title>
</head>
<body>
  <h1>null vs undefined</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 =
      JSON.stringify(_.defaultsDeep(
        { a: { b: null, c: undefined } },
        { a: { b: 1, c: 2, d: 3 } }
      ), null, 2);
  </script>
</body>
</html>

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Lodash _.defaultsDeep — null vs undefined (Try It)