Function buildAuthPreFill

showcase/harness/src/probes/scripts/d5-auth.ts:105–143

(
  opts: AuthAssertionOpts = {},
)

 *  and return immediately so the runner's normal fill+press hits the
 *  pre-mounted chat. */
export function buildAuthPreFill(
  opts: AuthAssertionOpts = {},
): (page: Page) => Promise<void> {
  const click = opts.click ?? defaultClick;
  const detectTimeout = opts.detectTimeoutMs ?? SIGN_IN_DETECT_TIMEOUT_MS;
  return async (page: Page): Promise<void> => {
    let isIdiomaticShape = false;
    try {
      await page.waitForSelector(SIGN_IN_BUTTON_SELECTOR, {
        state: "visible",
        timeout: detectTimeout,
      });
      isIdiomaticShape = true;
    } catch {
      // Sign-in button not visible — assume legacy shape (demo loads
      // directly into authenticated state, chat already mounted). The
      // runner's normal fill+press will hit it without preFill help.
      isIdiomaticShape = false;
    }

    if (!isIdiomaticShape) return;

    // Idiomatic shape — click sign-in to mount the chat tree.
    await click(page, SIGN_IN_BUTTON_SELECTOR);
    try {
      await page.waitForSelector(
        '[data-testid="copilot-chat-textarea"], [data-testid="copilot-chat-input"] textarea, textarea',
        {
          state: "visible",
          timeout: POST_SIGN_IN_CHAT_TIMEOUT_MS,
        },
      );
    } catch {
      throw new Error(
        `auth: chat textarea did not mount within ${POST_SIGN_IN_CHAT_TIMEOUT_MS}ms after sign-in — <CopilotKit> may have failed to handshake with the runtime`,
      );
    }
  };
}

export function buildAuthAssertion(
  opts: AuthAssertionOpts = {},