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.
const thickness = edge.presence === "visible" ? edge.thickness : 0;
    style.strokeWidth = measureToString(thickness);
    style.stroke = edgeStyle.color;
    let x1, y1, x2, y2;
    let width = "100%";
    let height = "100%";
    if (parent.w <= thickness) {
      [x1, y1, x2, y2] = ["50%", 0, "50%", "100%"];
      width = style.strokeWidth;
    } else if (parent.h <= thickness) {
      [x1, y1, x2, y2] = [0, "50%", "100%", "50%"];
      height = style.strokeWidth;
    } else {
      if (this.slope === "\\") {
        [x1, y1, x2, y2] = [0, 0, "100%", "100%"];
      } else {
        [x1, y1, x2, y2] = [0, "100%", "100%", 0];
      }
    }
    const line = {
      name: "line",
      attributes: {
        xmlns: SVG_NS,
        x1,
        y1,
        x2,
        y2,
        style,
      },
    };