test_private_field_xrays.js

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'use strict';

add_task(async function () {

  let webnav = Services.appShell.createWindowlessBrowser(false);

  let docShell = webnav.docShell;

  docShell.createAboutBlankDocumentViewer(null, null);

  let window = webnav.document.defaultView;

  let iframe = window.eval(`

    iframe = document.createElement("iframe");

    iframe.id = "iframe"

    document.body.appendChild(iframe)

    iframe`);

  let unwrapped = Cu.waiveXrays(iframe);

  class Base {

    constructor(o) {

      return o;

};

  class A extends Base {

    #x = 12;

    static gx(o) {

      return o.#x;

    static sx(o, v) {

      o.#x = v;

};

  new A(iframe);

  Assert.equal(A.gx(iframe), 12);

  A.sx(iframe, 'wrapped');

  // Shouldn't tunnel past xray.

  Assert.throws(() => A.gx(unwrapped), TypeError);

  Assert.throws(() => A.sx(unwrapped, 'unwrapped'), TypeError);

  new A(unwrapped);

  Assert.equal(A.gx(unwrapped), 12);

  Assert.equal(A.gx(iframe), 'wrapped');

  A.sx(iframe, 'modified');

  Assert.equal(A.gx(unwrapped), 12);

  A.sx(unwrapped, 16);

  Assert.equal(A.gx(iframe), 'modified');

});