Delete Leaves With a Given Value LeetCode solution in JavaScript

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var removeLeafNodes = function (root, target) {
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  const parent = new TreeNode(-1, root, null);
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  const traverse = (r = root, p = parent, child = -1) => {
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    if (!r) return null;
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    traverse(r.left, r, -1);
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    traverse(r.right, r, 1);
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    if (r.left == null && r.right == null && r.val == target) {
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      if (child == -1) p.left = null;
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      else p.right = null;
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    }
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  };
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  traverse();
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  return parent.left;
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};