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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>conforms — extra</title>
</head>
<body>
  <h1>Extra properties OK</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    var hasBigB = _.conforms({
      b: function (n) { return n > 1; }
    });

    var lines = [
      String(hasBigB({ a: 9, b: 2, c: "x" })),
      String(hasBigB({ b: 0, z: 1 }))
    ];
    document.getElementById("out").textContent = lines.join("\n");
  </script>
</body>
</html>

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Lodash _.conforms — extra keys (Try It)