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  <title>Lodash _.assignInWith — inherited keys</title>
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  <h1>_.assignInWith — inherited keys visited</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    (function () {
      function Source() {
        this.own = "instance";
      }
      Source.prototype.inherited = "prototype";
      var seen = [];
      function tag(objValue, srcValue, key) {
        seen.push(key);
        return String(srcValue).toUpperCase();
      }
      var result = _.assignInWith({}, new Source(), tag);
      var lines = [];
      lines.push("seen:   " + JSON.stringify(seen));
      lines.push("result: " + JSON.stringify(result));
      document.getElementById("out").textContent = lines.join(String.fromCharCode(10));
    })();
  </script>
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Lodash _.assignInWith — customizer sees inherited keys too (Try It)