fix(nitro): Scope sourcemap deletion to output dir and log it

`filesToDeleteAfterUpload` previously defaulted to `['**/*.map']`, which
is resolved from the project root and could traverse `node_modules`.
Scope the default to `nitro.options.output.serverDir` so we only touch
maps we generated. Also log the chosen glob in debug mode to match the
Nuxt SDK UX.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: logaretm

packages/nitro/src/sourceMaps.ts

@@ -67,18 +67,33 @@ function normalizePath(path: string): string {
   return path.replace(/^(\.\.\/)+/, './');
 }
 
+/**
+ * Removes a trailing slash from a path so glob patterns can be appended cleanly.
+ */
+function removeTrailingSlash(path: string): string {
+  return path.replace(/\/$/, '');
+}
+
 /**
  * Builds the plugin options for `createSentryBuildPluginManager` from the Sentry Nitro options.
  *
  * Only exported for testing purposes.
  */
+// oxlint-disable-next-line complexity
 export function getPluginOptions(
   options?: SentryNitroOptions,
   sentryEnabledSourcemaps?: boolean,
   outputDir?: string,
 ): BundlerPluginOptions {
   const defaultFilesToDelete =
-    sentryEnabledSourcemaps && outputDir ? [`${outputDir.replace(/\\/g, '/')}/**/*.map`] : undefined;
+    sentryEnabledSourcemaps && outputDir ? [`${removeTrailingSlash(outputDir)}/**/*.map`] : undefined;
+
+  if (options?.debug && defaultFilesToDelete && options?.sourcemaps?.filesToDeleteAfterUpload === undefined) {
+    // eslint-disable-next-line no-console
+    console.log(
+      `[@sentry/nitro] Setting \`sourcemaps.filesToDeleteAfterUpload: ["${defaultFilesToDelete[0]}"]\` to delete generated source maps after they were uploaded to Sentry.`,
+    );
+  }
 
   return {
     org: options?.org ?? process.env.SENTRY_ORG,

packages/nitro/test/sourceMaps.test.ts

@@ -51,11 +51,35 @@ describe('getPluginOptions', () => {
   });
 
   it('respects user-provided filesToDeleteAfterUpload even when Sentry enabled sourcemaps', () => {
-    const options = getPluginOptions({ sourcemaps: { filesToDeleteAfterUpload: ['dist/**/*.map'] } }, true);
+    const options = getPluginOptions(
+      { sourcemaps: { filesToDeleteAfterUpload: ['dist/**/*.map'] } },
+      true,
+      '/project/.output/server',
+    );
 
     expect(options.sourcemaps?.filesToDeleteAfterUpload).toEqual(['dist/**/*.map']);
   });
 
+  it('logs the default filesToDeleteAfterUpload glob in debug mode', () => {
+    const logSpy = vi.spyOn(console, 'log').mockImplementation(() => {});
+    getPluginOptions({ debug: true }, true, '/project/.output/server');
+
+    expect(logSpy).toHaveBeenCalledWith(expect.stringContaining('/project/.output/server/**/*.map'));
+    logSpy.mockRestore();
+  });
+
+  it('does not log the default glob when user provides filesToDeleteAfterUpload', () => {
+    const logSpy = vi.spyOn(console, 'log').mockImplementation(() => {});
+    getPluginOptions(
+      { debug: true, sourcemaps: { filesToDeleteAfterUpload: ['dist/**/*.map'] } },
+      true,
+      '/project/.output/server',
+    );
+
+    expect(logSpy).not.toHaveBeenCalledWith(expect.stringContaining('filesToDeleteAfterUpload'));
+    logSpy.mockRestore();
+  });
+
   it('uses environment variables as fallback', () => {
     process.env.SENTRY_ORG = 'env-org';
     process.env.SENTRY_PROJECT = 'env-project';