From d7df154059b479f0d7a2754a452682f37864da35 Mon Sep 17 00:00:00 2001
From: Joe Au-Yeung <65426560+joeauyeung@users.noreply.github.com>
Date: Tue, 28 Oct 2025 11:59:44 -0400
Subject: [PATCH] fix: Add critical logger for booking created log to prevent
 stdout buffering issues (#24570)

* Add critical logger for booking created log to prevent stdout buffering issues

Co-Authored-By: joe@cal.com <j.auyeung419@gmail.com>

* Add comment

* Separate critialLogger into it's own file

---------

Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Co-authored-by: Udit Takkar <53316345+Udit-takkar@users.noreply.github.com>
---
 apps/web/modules/signup-view.tsx              |  4 ++--
 .../playwright/dynamic-booking-pages.e2e.ts   |  4 ++--
 apps/web/playwright/lib/testUtils.ts          |  6 ++---
 .../playwright/organization/booking.e2e.ts    |  4 ++--
 .../organization-invitation.e2e.ts            |  4 ++--
 .../lib/service/RegularBookingService.ts      |  3 ++-
 .../components/locations/Locations.tsx        |  2 +-
 packages/lib/logger.server.ts                 | 24 +++++++++++++++++++
 packages/ui/components/form/select/Select.tsx |  2 +-
 9 files changed, 39 insertions(+), 14 deletions(-)
 create mode 100644 packages/lib/logger.server.ts

diff --git a/apps/web/modules/signup-view.tsx b/apps/web/modules/signup-view.tsx
index dc903b4930..d457b4b457 100644
--- a/apps/web/modules/signup-view.tsx
+++ b/apps/web/modules/signup-view.tsx
@@ -313,7 +313,7 @@ export default function Signup({
                 id="gtm-init-script"
                 // It is strictly not necessary to disable, but in a future update of react/no-danger this will error.
                 // And we don't want it to error here anyways
-                // eslint-disable-next-line react/no-danger
+                 
                 dangerouslySetInnerHTML={{
                   __html: `(function (w, d, s, l, i) {
                         w[l] = w[l] || []; w[l].push({ 'gtm.start': new Date().getTime(), event: 'gtm.js' });
@@ -323,7 +323,7 @@ export default function Signup({
                 }}
               />
               <noscript
-                // eslint-disable-next-line react/no-danger
+                 
                 dangerouslySetInnerHTML={{
                   __html: `<iframe src="https://www.googletagmanager.com/ns.html?id=${process.env.NEXT_PUBLIC_GTM_ID}" height="0" width="0" style="display:none;visibility:hidden"></iframe>`,
                 }}
diff --git a/apps/web/playwright/dynamic-booking-pages.e2e.ts b/apps/web/playwright/dynamic-booking-pages.e2e.ts
index 8ef6ac30e6..6bece87bf3 100644
--- a/apps/web/playwright/dynamic-booking-pages.e2e.ts
+++ b/apps/web/playwright/dynamic-booking-pages.e2e.ts
@@ -193,9 +193,9 @@ test.describe("Organization:", () => {
         });
         await expect(page.getByTestId("success-page")).toBeVisible();
         // All the teammates should be in the booking
-        // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+         
         await expect(page.getByText(user1.name!, { exact: true })).toBeVisible();
-        // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+         
         await expect(page.getByText(user2.name!, { exact: true })).toBeVisible();
       }
     );
diff --git a/apps/web/playwright/lib/testUtils.ts b/apps/web/playwright/lib/testUtils.ts
index 5f4fcb9865..a7ec3b62ee 100644
--- a/apps/web/playwright/lib/testUtils.ts
+++ b/apps/web/playwright/lib/testUtils.ts
@@ -4,7 +4,7 @@ import { createHash } from "crypto";
 import EventEmitter from "events";
 import type { IncomingMessage, ServerResponse } from "http";
 import { createServer } from "http";
-// eslint-disable-next-line no-restricted-imports
+ 
 import type { Messages } from "mailhog";
 import { totp } from "otplib";
 import { v4 as uuid } from "uuid";
@@ -213,7 +213,7 @@ export async function setupManagedEvent({
     addManagedEventToTeamMates: true,
     managedEventUnlockedFields: unlockedFields,
   });
-  // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+   
   const memberUser = users.get().find((u) => u.name === teamMateName)!;
   const { team } = await adminUser.getFirstTeamMembership();
   const managedEvent = await adminUser.getFirstTeamEvent(team.id, SchedulingType.MANAGED);
@@ -365,7 +365,7 @@ async function createUserWithSeatedEvent(users: Fixtures["users"]) {
       },
     ],
   });
-  // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+   
   const eventType = user.eventTypes.find((e) => e.slug === slug)!;
   return { user, eventType };
 }
diff --git a/apps/web/playwright/organization/booking.e2e.ts b/apps/web/playwright/organization/booking.e2e.ts
index 85bb1e3ba0..9f2b727c60 100644
--- a/apps/web/playwright/organization/booking.e2e.ts
+++ b/apps/web/playwright/organization/booking.e2e.ts
@@ -184,7 +184,7 @@ test.describe("Bookings", () => {
           // Anyone of the teammates could be the Host of the booking.
           const chosenUser = await page.getByTestId("booking-host-name").textContent();
           expect(chosenUser).not.toBeNull();
-          // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+           
           expect(teamMatesObj.concat([{ name: owner.name! }]).some(({ name }) => name === chosenUser)).toBe(
             true
           );
@@ -248,7 +248,7 @@ test.describe("Bookings", () => {
           // Anyone of the teammates could be the Host of the booking.
           const chosenUser = await page.getByTestId("booking-host-name").textContent();
           expect(chosenUser).not.toBeNull();
-          // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+           
           expect(teamMatesObj.concat([{ name: owner.name! }]).some(({ name }) => name === chosenUser)).toBe(
             true
           );
diff --git a/apps/web/playwright/organization/organization-invitation.e2e.ts b/apps/web/playwright/organization/organization-invitation.e2e.ts
index 496bdc1ae4..1183634168 100644
--- a/apps/web/playwright/organization/organization-invitation.e2e.ts
+++ b/apps/web/playwright/organization/organization-invitation.e2e.ts
@@ -90,7 +90,7 @@ test.describe("Organization", () => {
 
     // This test is already covered by booking.e2e.ts where existing user is invited and his booking links are tested.
     // We can re-test here when we want to test some more scenarios.
-    // eslint-disable-next-line @typescript-eslint/no-empty-function
+     
     test("existing user invited to an organization", () => {});
 
     test("nonexisting user invited to a Team inside organization", async ({
@@ -313,7 +313,7 @@ test.describe("Organization", () => {
         await page.locator('[data-testid="continue-with-email-button"]').click();
         await expect(page.locator('[data-testid="signup-submit-button"]')).toBeVisible();
 
-        // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+         
         await page.locator('input[name="username"]').fill(existingUser.username!);
         await page
           .locator('input[name="email"]')
diff --git a/packages/features/bookings/lib/service/RegularBookingService.ts b/packages/features/bookings/lib/service/RegularBookingService.ts
index ce9d416284..436acf08bf 100644
--- a/packages/features/bookings/lib/service/RegularBookingService.ts
+++ b/packages/features/bookings/lib/service/RegularBookingService.ts
@@ -67,6 +67,7 @@ import getOrgIdFromMemberOrTeamId from "@calcom/lib/getOrgIdFromMemberOrTeamId";
 import { getTeamIdFromEventType } from "@calcom/lib/getTeamIdFromEventType";
 import { HttpError } from "@calcom/lib/http-error";
 import logger from "@calcom/lib/logger";
+import { criticalLogger } from "@calcom/lib/logger.server";
 import { getPiiFreeCalendarEvent, getPiiFreeEventType } from "@calcom/lib/piiFreeData";
 import { safeStringify } from "@calcom/lib/safeStringify";
 import { getTranslation } from "@calcom/lib/server/i18n";
@@ -1726,7 +1727,7 @@ async function handler(
         await usersRepository.updateLastActiveAt(booking.userId);
         const organizerUserAvailability = availableUsers.find((user) => user.id === booking?.userId);
 
-        logger.info(`Booking created`, {
+        criticalLogger.info(`Booking created`, {
           bookingUid: booking.uid,
           selectedCalendarIds: organizerUser.allSelectedCalendars?.map((c) => c.id) ?? [],
           availabilitySnapshot: organizerUserAvailability?.availabilityData
diff --git a/packages/features/eventtypes/components/locations/Locations.tsx b/packages/features/eventtypes/components/locations/Locations.tsx
index f2ce3d7df3..de615985a0 100644
--- a/packages/features/eventtypes/components/locations/Locations.tsx
+++ b/packages/features/eventtypes/components/locations/Locations.tsx
@@ -149,7 +149,7 @@ const Locations: React.FC<LocationsProps> = ({
   );
 
   useEffect(() => {
-    if (!!prefillLocation) {
+    if (prefillLocation) {
       const newLocationType = prefillLocation.value;
 
       const canAppendLocation = !validLocations.find((location) => location.type === newLocationType);
diff --git a/packages/lib/logger.server.ts b/packages/lib/logger.server.ts
new file mode 100644
index 0000000000..4b2fff058e
--- /dev/null
+++ b/packages/lib/logger.server.ts
@@ -0,0 +1,24 @@
+import fs from "fs";
+
+import logger from "./logger";
+
+/** This should be used if we want to ensure a log statement is always executed.
+ *
+ * This should only be used server side
+ */
+export const criticalLogger = logger.getSubLogger({
+  name: "critical",
+  overwrite: {
+    transportJSON: (logObj) => {
+      const logString = JSON.stringify(logObj);
+      const buffer = Buffer.from(logString + "\n");
+
+      try {
+        fs.writeSync(process.stdout.fd, buffer);
+      } catch (error) {
+        console.log(`Critical logger: Failed to write log using fs.writeSync: ${error}`);
+        console.log(logString);
+      }
+    },
+  },
+});
diff --git a/packages/ui/components/form/select/Select.tsx b/packages/ui/components/form/select/Select.tsx
index 166b16a2a8..2816b55684 100644
--- a/packages/ui/components/form/select/Select.tsx
+++ b/packages/ui/components/form/select/Select.tsx
@@ -219,7 +219,7 @@ export function SelectWithValidation<
             position: "absolute",
           }}
           value={hiddenInputValue}
-          // eslint-disable-next-line @typescript-eslint/no-empty-function
+           
           onChange={() => {}}
           // TODO:Not able to get focus to work
           // onFocus={() => selectRef.current?.focus()}