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.
node[$extra].target = target;
      return true;
    }
    return false;
  }
  if (!(target instanceof ContentArea)) {
    target = null;
  }
  const pageArea = target && target[$getParent]();
  let index;
  if (node.startNew) {
    if (target) {
      const contentAreas = pageArea.contentArea.children;
      index = contentAreas.findIndex(e => e === target) - 1;
    } else {
      index = currentPageArea.contentArea.children.findIndex(
        e => e === currentContentArea
      );
    }
  } else if (target && target !== currentContentArea) {
    const contentAreas = pageArea.contentArea.children;
    index = contentAreas.findIndex(e => e === target) - 1;
  } else {
    return false;
  }
  node[$extra].target = pageArea === currentPageArea ? null : pageArea;
  node[$extra].index = index;
  return true;
}
function handleOverflow(node, extraNode, space) {