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.
constructor(attributes) {
    super(TEMPLATE_NS_ID, "proto",  true);
    this.appearanceFilter = new XFAObjectArray();
    this.arc = new XFAObjectArray();
    this.area = new XFAObjectArray();
    this.assist = new XFAObjectArray();
    this.barcode = new XFAObjectArray();
    this.bindItems = new XFAObjectArray();
    this.bookend = new XFAObjectArray();
    this.boolean = new XFAObjectArray();
    this.border = new XFAObjectArray();
    this.break = new XFAObjectArray();
    this.breakAfter = new XFAObjectArray();
    this.breakBefore = new XFAObjectArray();
    this.button = new XFAObjectArray();
    this.calculate = new XFAObjectArray();
    this.caption = new XFAObjectArray();
    this.certificate = new XFAObjectArray();
    this.certificates = new XFAObjectArray();
    this.checkButton = new XFAObjectArray();
    this.choiceList = new XFAObjectArray();
    this.color = new XFAObjectArray();
    this.comb = new XFAObjectArray();
    this.connect = new XFAObjectArray();
    this.contentArea = new XFAObjectArray();