fix: handle ppr error message refactor

.changeset/small-cycles-hug.md

@@ -0,0 +1,9 @@
+---
+'@clerk/nextjs': patch
+---
+
+Updated the check ran against the error caught by `buildRequestLike()` to re-throw Static Bailout errors thrown by React in the context of PPR (Partial Pre-Rendering), as these errors shouldn't be caught. This change was required as we have been checking the error message itself, but stopped working after the message was changed in a Next.js update a few months ago.
+
+- Breaking PR: https://github.com/vercel/next.js/commit/3008af6b0e7b2c8aadd986bdcbce5bad6c39ccc8#diff-20c354509ae1e93e143d91b67b75e3df592c38b7d1ec6ccf7c4a2f72b32ab17d
+- Why PPR errors shouldn't be caught: https://nextjs.org/docs/messages/ppr-caught-error
+- Previous fix: https://github.com/clerk/javascript/pull/2518

packages/nextjs/src/app-router/server/utils.ts

@@ -1,5 +1,22 @@
 import { NextRequest } from 'next/server';
 
+const isPrerenderingBailout = (e: unknown) => {
+  if (!(e instanceof Error) || !('message' in e)) return false;
+
+  const { message } = e;
+
+  const lowerCaseInput = message.toLowerCase();
+  const dynamicServerUsage = lowerCaseInput.includes('dynamic server usage');
+  const bailOutPrerendering = lowerCaseInput.includes('this page needs to bail out of prerendering');
+
+  // note: new error message syntax introduced in next@14.1.1-canary.21
+  // but we still want to support older versions.
+  // https://github.com/vercel/next.js/pull/61332 (dynamic-rendering.ts:153)
+  const routeRegex = /Route .*? needs to bail out of prerendering at this point because it used .*?./;
+
+  return routeRegex.test(message) || dynamicServerUsage || bailOutPrerendering;
+};
+
 export const buildRequestLike = () => {
   try {
     // Dynamically import next/headers, otherwise Next12 apps will break
@@ -8,15 +25,9 @@ export const buildRequestLike = () => {
     const { headers } = require('next/headers');
     return new NextRequest('https://placeholder.com', { headers: headers() });
   } catch (e: any) {
-    if (
-      e &&
-      'message' in e &&
-      typeof e.message === 'string' &&
-      (e.message.toLowerCase().includes('Dynamic server usage'.toLowerCase()) ||
-        e.message.toLowerCase().includes('This page needs to bail out of prerendering'.toLowerCase()))
-    ) {
-      throw e;
-    }
+    // rethrow the error when react throws a prerendering bailout
+    // https://nextjs.org/docs/messages/ppr-caught-error
+    if (e && isPrerenderingBailout(e)) throw e;
 
     throw new Error(
       `Clerk: auth() and currentUser() are only supported in App Router (/app directory).\nIf you're using /pages, try getAuth() instead.\nOriginal error: ${e}`,