feat(nextjs): Inject manifest into client for webpack builds

packages/nextjs/src/config/types.ts

@@ -467,6 +467,24 @@ export type SentryBuildOptions = {
    */
   suppressOnRouterTransitionStartWarning?: boolean;
 
+  /**
+   * Disables automatic injection of the route manifest into the client bundle.
+   *
+   * The route manifest is a build-time generated mapping of your Next.js App Router
+   * routes that enables Sentry to group transactions by parameterized route names
+   * (e.g., `/users/:id` instead of `/users/123`, `/users/456`, etc.).
+   *
+   * **Disable this option if:**
+   * - You want to minimize client bundle size
+   * - You're experiencing build issues related to route scanning
+   * - You're using custom routing that the scanner can't detect
+   * - You prefer raw URLs in transaction names
+   * - You're only using Pages Router (this feature is only supported in the App Router)
+   *
+   * @default false
+   */
+  disableManifestInjection?: boolean;
+
   /**
    * Contains a set of experimental flags that might change in future releases. These flags enable
    * features that are still in development and may be modified, renamed, or removed without notice.

packages/nextjs/src/config/webpack.ts

@@ -7,6 +7,7 @@ import * as fs from 'fs';
 import * as path from 'path';
 import { sync as resolveSync } from 'resolve';
 import type { VercelCronsConfig } from '../common/types';
+import type { RouteManifest } from './manifest/types';
 // Note: If you need to import a type from Webpack, do it in `types.ts` and export it from there. Otherwise, our
 // circular dependency check thinks this file is importing from itself. See https://github.com/pahen/madge/issues/306.
 import type {
@@ -43,6 +44,7 @@ export function constructWebpackConfigFunction(
   userNextConfig: NextConfigObject = {},
   userSentryOptions: SentryBuildOptions = {},
   releaseName: string | undefined,
+  routeManifest: RouteManifest | undefined,
 ): WebpackConfigFunction {
   // Will be called by nextjs and passed its default webpack configuration and context data about the build (whether
   // we're building server or client, whether we're in dev, what version of webpack we're using, etc). Note that
@@ -88,7 +90,7 @@ export function constructWebpackConfigFunction(
     const newConfig = setUpModuleRules(rawNewConfig);
 
     // Add a loader which will inject code that sets global values
-    addValueInjectionLoader(newConfig, userNextConfig, userSentryOptions, buildContext, releaseName);
+    addValueInjectionLoader(newConfig, userNextConfig, userSentryOptions, buildContext, releaseName, routeManifest);
 
     addOtelWarningIgnoreRule(newConfig);
 
@@ -686,6 +688,7 @@ function addValueInjectionLoader(
   userSentryOptions: SentryBuildOptions,
   buildContext: BuildContext,
   releaseName: string | undefined,
+  routeManifest: RouteManifest | undefined,
 ): void {
   const assetPrefix = userNextConfig.assetPrefix || userNextConfig.basePath || '';
 
@@ -727,6 +730,7 @@ function addValueInjectionLoader(
     _sentryExperimentalThirdPartyOriginStackFrames: userSentryOptions._experimental?.thirdPartyOriginStackFrames
       ? 'true'
       : undefined,
+    _sentryRouteManifest: JSON.stringify(routeManifest),
   };
 
   if (buildContext.isServer) {

packages/nextjs/src/config/withSentryConfig.ts

@@ -5,6 +5,8 @@ import { getSentryRelease } from '@sentry/node';
 import * as childProcess from 'child_process';
 import * as fs from 'fs';
 import * as path from 'path';
+import { createRouteManifest } from './manifest/createRouteManifest';
+import type { RouteManifest } from './manifest/types';
 import type {
   ExportedNextConfig as NextConfig,
   NextConfigFunction,
@@ -141,6 +143,11 @@ function getFinalConfigObject(
     }
   }
 
+  let routeManifest: RouteManifest | undefined;
+  if (!userSentryOptions.disableManifestInjection) {
+    routeManifest = createRouteManifest();
+  }
+
   setUpBuildTimeVariables(incomingUserNextConfigObject, userSentryOptions, releaseName);
 
   const nextJsVersion = getNextjsVersion();
@@ -300,7 +307,12 @@ function getFinalConfigObject(
             ],
           },
         }),
-    webpack: constructWebpackConfigFunction(incomingUserNextConfigObject, userSentryOptions, releaseName),
+    webpack: constructWebpackConfigFunction(
+      incomingUserNextConfigObject,
+      userSentryOptions,
+      releaseName,
+      routeManifest,
+    ),
   };
 }