The following code is flagged as dead (since it's *replacing* rather than updating the existing Object):
https://github.com/mozilla/pdf.js/blob/4483cba72410027acf46630ebf252ae529704476/src/core/xfa/template.js#L2336-L2339
according to the alert in https://github.com/mozilla/pdf.js/security/code-scanning/103?query=ref%3Arefs%2Fheads%2Fmaster

Looking at the surrounding code, I can see a couple of possibilities here:
 1. This is indeed just dead code, which should be removed.
 2. The code should be moved up, and placed just *above* the previous block instead.
 3. There should be other, more invasive, changes made to this code...

/cc @calixteman Which solution is correct here?
Assuming it's either option 1 or 2, I can submit a patch to fix this.
$appendChild,
  $childrenToHTML,
  $clean,
  $cleanPage,
  $content,
  $data,
  $extra,
  $finalize,
  $flushHTML,
  $getAvailableSpace,
  $getChildren,
  $getContainedChildren,
  $getExtra,
  $getNextPage,
  $getParent,
  $getSubformParent,
  $getTemplateRoot,
  $globalData,
  $hasSettableValue,
  $ids,
  $isBindable,
  $isCDATAXml,
  $isSplittable,
  $isThereMoreWidth,
  $isTransparent,
  $isUsable,
  $namespaceId,
  $nodeName,
  $onChild,
  $onText,