Function recordHandshakeOrdering

e2e/scenarios/artifacts.test.ts:123–141

(page: Page)

}

const recordHandshakeOrdering = async (page: Page): Promise<void> => {
  await page.addInitScript(() => {
    globalThis.__handshakeOrder = [];
    const original = EventTarget.prototype.addEventListener;
    EventTarget.prototype.addEventListener = function (type, listener, options) {
      if (type === "message" && this === window) {
        const frame = document.querySelector<HTMLIFrameElement>(
          '[data-testid="artifact-shell-frame"]',
        );
        // No frame yet is even earlier than about:blank, so it satisfies the
        // invariant too; "(none)" keeps that case distinguishable in a failure.
        globalThis.__handshakeOrder?.push(
          frame ? (frame.contentDocument?.URL ?? "(no document)") : "(none)",
        );
      }
      return original.call(this, type, listener, options as never);
    };
  });
};

const readHandshakeOrdering = (page: Page): Promise<ReadonlyArray<string>> =>
  page.evaluate(() => globalThis.__handshakeOrder ?? []);