feat(nextjs): Un experimentify clientInstrumentationHook (#15992)

They actually unexperimentified it
vercel/next.js@2737373

Author: lforst

Diff for: CHANGELOG.md

@@ -119,7 +119,7 @@ Work in this release was contributed by @Page-. Thank you for your contribution!
 
 - **feat(nextjs): Support `instrumentation-client.ts` ([#15705](https://github.com/getsentry/sentry-javascript/pull/15705))**
 
-  Next.js recently added a feature to support [client-side (browser) instrumentation via the `experimental.clientInstrumentationHook` flag and the `instrumentation-client.ts` file](https://nextjs.org/docs/app/api-reference/config/next-config-js/clientInstrumentationHook).
+  Next.js recently added a feature to support [client-side (browser) instrumentation via a `instrumentation-client.ts` file](https://nextjs.org/docs/app/api-reference/file-conventions/instrumentation-client).
 
   To be forwards compatible, the Sentry Next.js SDK will now pick up `instrumentation-client.ts` files even on older Next.js versions and add them to your client bundles.
   It is suggested that you either rename your `sentry.client.config.ts` file to `instrumentation-client.ts`, or if you already happen to have a `instrumentation-client.ts` file move the contents of `sentry.client.config.ts` to `instrumentation-client.ts`.

Diff for: dev-packages/e2e-tests/test-applications/nextjs-turbo/package.json

@@ -17,7 +17,7 @@
     "@types/node": "^18.19.1",
     "@types/react": "18.0.26",
     "@types/react-dom": "18.0.9",
-    "next": "15.3.0-canary.26",
+    "next": "15.3.0-canary.40",
     "react": "rc",
     "react-dom": "rc",
     "typescript": "~5.0.0"

Diff for: packages/nextjs/src/config/types.ts

@@ -44,7 +44,6 @@ export type NextConfigObject = {
   // Next.js experimental options
   experimental?: {
     instrumentationHook?: boolean;
-    clientInstrumentationHook?: boolean;
     clientTraceMetadata?: string[];
   };
   productionBrowserSourceMaps?: boolean;

Diff for: packages/nextjs/src/config/webpack.ts

@@ -344,7 +344,7 @@ export function constructWebpackConfigFunction(
       if (clientSentryConfigFileName) {
         // eslint-disable-next-line no-console
         console.warn(
-          `[@sentry/nextjs] DEPRECATION WARNING: It is recommended renaming your \`${clientSentryConfigFileName}\` file, or moving its content to \`instrumentation-client.ts\`. When using Turbopack \`${clientSentryConfigFileName}\` will no longer work. Read more about the \`instrumentation-client.ts\` file: https://nextjs.org/docs/app/api-reference/config/next-config-js/clientInstrumentationHook`,
+          `[@sentry/nextjs] DEPRECATION WARNING: It is recommended renaming your \`${clientSentryConfigFileName}\` file, or moving its content to \`instrumentation-client.ts\`. When using Turbopack \`${clientSentryConfigFileName}\` will no longer work. Read more about the \`instrumentation-client.ts\` file: https://nextjs.org/docs/app/api-reference/file-conventions/instrumentation-client`,
         );
       }
     }

Diff for: packages/nextjs/src/config/withSentryConfig.ts

@@ -173,15 +173,10 @@ function getFinalConfigObject(
       minor === 3 &&
       patch === 0 &&
       prerelease.startsWith('canary.') &&
-      parseInt(prerelease.split('.')[1] || '', 10) >= 8;
+      parseInt(prerelease.split('.')[1] || '', 10) >= 28;
     const supportsClientInstrumentation = isSupportedCanary || isSupportedVersion;
 
-    if (supportsClientInstrumentation) {
-      incomingUserNextConfigObject.experimental = {
-        clientInstrumentationHook: true,
-        ...incomingUserNextConfigObject.experimental,
-      };
-    } else if (process.env.TURBOPACK) {
+    if (!supportsClientInstrumentation && process.env.TURBOPACK) {
       if (process.env.NODE_ENV === 'development') {
         // eslint-disable-next-line no-console
         console.warn(
@@ -194,19 +189,6 @@ function getFinalConfigObject(
         );
       }
     }
-  } else {
-    // If we cannot detect a Next.js version for whatever reason, the sensible default is still to set the `experimental.instrumentationHook`.
-    incomingUserNextConfigObject.experimental = {
-      clientInstrumentationHook: true,
-      ...incomingUserNextConfigObject.experimental,
-    };
-  }
-
-  if (incomingUserNextConfigObject.experimental?.clientInstrumentationHook === false) {
-    // eslint-disable-next-line no-console
-    console.warn(
-      '[@sentry/nextjs] WARNING: You set the `experimental.clientInstrumentationHook` option to `false`. Note that Sentry will not be initialized if you did not set it up inside `instrumentation-client.(js|ts)`.',
-    );
   }
 
   return {