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.
width: this.medium.long,
          height: this.medium.short,
        };
      }
    } else {
      warn("XFA - No medium specified in pageArea: please file a bug.");
    }
    this[$childrenToHTML]({
      filter: new Set(["area", "draw", "field", "subform"]),
      include: true,
    });
    
    
    this[$childrenToHTML]({
      filter: new Set(["contentArea"]),
      include: true,
    });
    return HTMLResult.success({
      name: "div",
      children,
      attributes: {
        class: ["xfaPage"],
        id: this[$uid],
        style,
        xfaName: this.name,
      },
    });
  }
}
class PageSet extends XFAObject {