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.
_setValue(this, value);
  }
  [$getExtra](availableSpace) {
    if (!this[$extra]) {
      let { width, height } = availableSpace;
      switch (this.placement) {
        case "left":
        case "right":
        case "inline":
          width = this.reserve <= 0 ? width : this.reserve;
          break;
        case "top":
        case "bottom":
          height = this.reserve <= 0 ? height : this.reserve;
          break;
      }
      this[$extra] = layoutNode(this, { width, height });
    }
    return this[$extra];
  }
  [$toHTML](availableSpace) {
    
    if (!this.value) {
      return HTMLResult.EMPTY;