fix(nuxt): Add nuxt-module-builder for build output (#13183)

Reverting the change in this PR:
#13138
For the time being (until this is debugged and fixed), this change is
reverted and the Nuxt module will still be built with the
nuxt-module-builder.

The changed build-setup led to an error in `nuxt dev` and the navigation
in the E2E test apps did not work. The error message:
```
ERROR  [worker reload] [worker init] Package import specifier "#internal/nitro/virtual/app-config" is not defined in package /Users/sigridh/Documents/DEV/sentry-javascript-examples/node_modules/nitropack/package.json imported from /Users/sigridh/Documents/DEV/sentry-javascript-examples/node_modules/nitropack/dist/runtime/config.mjs
```

Similar errors were reported here:

- nuxt/content#2736
- nuxt/icon#204
- nuxt/nuxt#13801

packages/nuxt/package.json

@@ -30,9 +30,9 @@
       }
     },
     "./module": {
-      "types": "./build/types/module/index.d.ts",
-      "import": "./build/esm/module/index.js",
-      "require": "./build/cjs/module/index.js"
+      "types": "./build/module/types.d.ts",
+      "import": "./build/module/module.mjs",
+      "require": "./build/module/module.cjs"
     }
   },
   "publishConfig": {
@@ -53,12 +53,14 @@
     "@sentry/vue": "8.22.0"
   },
   "devDependencies": {
+    "@nuxt/module-builder": "0.8.1",
     "nuxt": "^3.12.2"
   },
   "scripts": {
     "build": "run-s build:types build:transpile",
     "build:dev": "yarn build",
-    "build:transpile": "rollup -c rollup.npm.config.mjs",
+    "build:nuxt-module": "nuxt-module-build build --outDir build/module",
+    "build:transpile": "rollup -c rollup.npm.config.mjs && yarn build:nuxt-module",
     "build:types": "tsc -p tsconfig.types.json",
     "build:watch": "run-p build:transpile:watch build:types:watch",
     "build:dev:watch": "yarn build:watch",
@@ -88,8 +90,7 @@
         "outputs": [
           "{projectRoot}/build/cjs",
           "{projectRoot}/build/esm",
-          "{projectRoot}/build/cjs/module",
-          "{projectRoot}/build/esm/module"
+          "{projectRoot}/build/module"
         ]
       }
     }

packages/nuxt/rollup.npm.config.mjs

@@ -8,28 +8,27 @@ export default [
         'src/index.client.ts',
         'src/client/index.ts',
         'src/server/index.ts',
-        'src/module/index.ts',
+        'src/module.ts',
       ],
       packageSpecificConfig: {
         external: ['nuxt/app'],
       },
     }),
   ),
+  /*  The Nuxt module plugins are also built with the @nuxt/module-builder.
+      This rollup setup is still left here for an easier switch between the setups while
+      manually testing different built outputs (module-builder vs. rollup only) */
   ...makeNPMConfigVariants(
     makeBaseNPMConfig({
-      entrypoints: ['src/module/plugins/sentry.client.ts', 'src/module/plugins/sentry.server.ts'],
+      entrypoints: ['src/runtime/plugins/sentry.client.ts', 'src/runtime/plugins/sentry.server.ts'],
 
       packageSpecificConfig: {
         external: ['nuxt/app', 'nitropack/runtime', 'h3'],
         output: {
           // Preserve the original file structure (i.e., so that everything is still relative to `src`)
-          entryFileNames: 'module/[name].js',
+          entryFileNames: 'runtime/[name].js',
         },
       },
     }),
   ),
 ];
-
-/*
-
- */

packages/nuxt/src/module/index.ts → packages/nuxt/src/module.ts

@@ -1,8 +1,8 @@
 import * as fs from 'fs';
 import * as path from 'path';
 import { addPlugin, addPluginTemplate, addServerPlugin, createResolver, defineNuxtModule } from '@nuxt/kit';
-import type { SentryNuxtModuleOptions } from '../common/types';
-import { setupSourceMaps } from '../vite/sourceMaps';
+import type { SentryNuxtModuleOptions } from './common/types';
+import { setupSourceMaps } from './vite/sourceMaps';
 
 export type ModuleOptions = SentryNuxtModuleOptions;
 
@@ -31,7 +31,7 @@ export default defineNuxtModule<ModuleOptions>({
           'export default defineNuxtPlugin(() => {})',
       });
 
-      addPlugin({ src: moduleDirResolver.resolve('./plugins/sentry.client'), mode: 'client' });
+      addPlugin({ src: moduleDirResolver.resolve('./runtime/plugins/sentry.client'), mode: 'client' });
     }
 
     const serverConfigFile = findDefaultSdkInitFile('server');
@@ -46,7 +46,7 @@ export default defineNuxtModule<ModuleOptions>({
           'export default defineNuxtPlugin(() => {})',
       });
 
-      addServerPlugin(moduleDirResolver.resolve('./plugins/sentry.server'));
+      addServerPlugin(moduleDirResolver.resolve('./runtime/plugins/sentry.server'));
     }
 
     if (clientConfigFile || serverConfigFile) {

packages/nuxt/test/client/runtime/utils.test.ts

@@ -1,5 +1,5 @@
 import { describe, expect, it } from 'vitest';
-import { extractErrorContext } from '../../../src/module/utils';
+import { extractErrorContext } from '../../../src/runtime/utils';
 
 describe('extractErrorContext', () => {
   it('returns empty object for undefined or empty context', () => {

packages/nuxt/test/server/runtime/plugin.test.ts

@@ -1,5 +1,5 @@
 import { afterEach, describe, expect, it, vi } from 'vitest';
-import { addSentryTracingMetaTags } from '../../../src/module/utils';
+import { addSentryTracingMetaTags } from '../../../src/runtime/utils';
 
 const mockReturns = vi.hoisted(() => {
   return {