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  <meta charset="utf-8">
  <title>Lodash cloneDeepWith — nested node</title>
</head>
<body>
  <h1>_.cloneDeepWith — nested leaf</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    (function () {
      var source = {
        label: "root",
        node: { id: 1, tag: "leaf" }
      };
      var copy = _.cloneDeepWith(source, function (value, key) {
        if (key === "node" && value && typeof value === "object") {
          return { id: value.id, tag: value.tag.toUpperCase() };
        }
      });
      document.getElementById("out").textContent =
        "nestedTag: " + copy.node.tag + "\n" +
        "nestedRefSameAsSource: " + (copy.node === source.node);
    })();
  </script>
</body>
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Lodash _.cloneDeepWith — custom nested node (Try It)