fix(nextjs): Use posix paths for sourcemap uploads

Currently, we use `path.join` to provide sourcemap directories.
On Windows, the resulting strings would use `\` which is an escape
character for glob patterns and thus no sourcemaps would be found.

This fix ensures we use posix paths which glob then handles correctly
on Windows too.

Closes: #13270
Partly fixes: #13288

packages/nextjs/src/config/webpackPluginOptions.ts

@@ -11,37 +11,43 @@ export function getWebpackPluginOptions(
   buildContext: BuildContext,
   sentryBuildOptions: SentryBuildOptions,
 ): SentryWebpackPluginOptions {
-  const { buildId, isServer, config: userNextConfig, dir: projectDir, nextRuntime } = buildContext;
+  const { buildId, isServer, config: userNextConfig, dir, nextRuntime } = buildContext;
 
   const prefixInsert = !isServer ? 'Client' : nextRuntime === 'edge' ? 'Edge' : 'Node.js';
 
-  const distDirAbsPath = path.join(projectDir, (userNextConfig as NextConfigObject).distDir || '.next'); // `.next` is the default directory
+  // We need to convert paths to posix because Glob patterns use `\` to escape
+  // glob characters. This clashes with Windows path separators.
+  // See: https://www.npmjs.com/package/glob
+  const projectDir = dir.replace(/\\/g, '/');
+  // `.next` is the default directory
+  const distDir = (userNextConfig as NextConfigObject).distDir?.replace(/\\/g, '/') ?? '.next';
+  const distDirAbsPath = path.posix.join(projectDir, distDir);
 
   let sourcemapUploadAssets: string[] = [];
   const sourcemapUploadIgnore: string[] = [];
 
   if (isServer) {
     sourcemapUploadAssets.push(
-      path.join(distDirAbsPath, 'server', '**'), // This is normally where Next.js outputs things
-      path.join(distDirAbsPath, 'serverless', '**'), // This was the output location for serverless Next.js
+      path.posix.join(distDirAbsPath, 'server', '**'), // This is normally where Next.js outputs things
+      path.posix.join(distDirAbsPath, 'serverless', '**'), // This was the output location for serverless Next.js
     );
   } else {
     if (sentryBuildOptions.widenClientFileUpload) {
-      sourcemapUploadAssets.push(path.join(distDirAbsPath, 'static', 'chunks', '**'));
+      sourcemapUploadAssets.push(path.posix.join(distDirAbsPath, 'static', 'chunks', '**'));
     } else {
       sourcemapUploadAssets.push(
-        path.join(distDirAbsPath, 'static', 'chunks', 'pages', '**'),
-        path.join(distDirAbsPath, 'static', 'chunks', 'app', '**'),
+        path.posix.join(distDirAbsPath, 'static', 'chunks', 'pages', '**'),
+        path.posix.join(distDirAbsPath, 'static', 'chunks', 'app', '**'),
       );
     }
 
     // TODO: We should think about uploading these when `widenClientFileUpload` is `true`. They may be useful in some situations.
     sourcemapUploadIgnore.push(
-      path.join(distDirAbsPath, 'static', 'chunks', 'framework-*'),
-      path.join(distDirAbsPath, 'static', 'chunks', 'framework.*'),
-      path.join(distDirAbsPath, 'static', 'chunks', 'main-*'),
-      path.join(distDirAbsPath, 'static', 'chunks', 'polyfills-*'),
-      path.join(distDirAbsPath, 'static', 'chunks', 'webpack-*'),
+      path.posix.join(distDirAbsPath, 'static', 'chunks', 'framework-*'),
+      path.posix.join(distDirAbsPath, 'static', 'chunks', 'framework.*'),
+      path.posix.join(distDirAbsPath, 'static', 'chunks', 'main-*'),
+      path.posix.join(distDirAbsPath, 'static', 'chunks', 'polyfills-*'),
+      path.posix.join(distDirAbsPath, 'static', 'chunks', 'webpack-*'),
     );
   }
 
@@ -79,9 +85,9 @@ export function getWebpackPluginOptions(
             // We only care to delete client bundle source maps because they would be the ones being served.
             // Removing the server source maps crashes Vercel builds for (thus far) unknown reasons:
             // https://github.com/getsentry/sentry-javascript/issues/13099
-            path.join(distDirAbsPath, 'static', '**', '*.js.map'),
-            path.join(distDirAbsPath, 'static', '**', '*.mjs.map'),
-            path.join(distDirAbsPath, 'static', '**', '*.cjs.map'),
+            path.posix.join(distDirAbsPath, 'static', '**', '*.js.map'),
+            path.posix.join(distDirAbsPath, 'static', '**', '*.mjs.map'),
+            path.posix.join(distDirAbsPath, 'static', '**', '*.cjs.map'),
           ]
         : undefined,
       ...sentryBuildOptions.unstable_sentryWebpackPluginOptions?.sourcemaps,

packages/nextjs/test/config/webpack/webpackPluginOptions.test.ts

@@ -2,14 +2,15 @@ import type { BuildContext, NextConfigObject } from '../../../src/config/types';
 import { getWebpackPluginOptions } from '../../../src/config/webpackPluginOptions';
 
 function generateBuildContext(overrides: {
+  dir?: string;
   isServer: boolean;
   nextjsConfig?: NextConfigObject;
 }): BuildContext {
   return {
     dev: false, // The plugin is not included in dev mode
     isServer: overrides.isServer,
     buildId: 'test-build-id',
-    dir: '/my/project/dir',
+    dir: overrides.dir ?? '/my/project/dir',
     config: overrides.nextjsConfig ?? {},
     totalPages: 2,
     defaultLoaders: true,
@@ -171,4 +172,19 @@ describe('getWebpackPluginOptions()', () => {
       assets: [],
     });
   });
+
+  it('passes posix paths to the plugin', () => {
+    const buildContext = generateBuildContext({ dir: 'C:\\my\\windows\\project\\dir', isServer: false });
+    const generatedPluginOptions = getWebpackPluginOptions(buildContext, { widenClientFileUpload: true });
+    expect(generatedPluginOptions.sourcemaps).toMatchObject({
+      assets: ['C:/my/windows/project/dir/.next/static/chunks/**'],
+      ignore: [
+        'C:/my/windows/project/dir/.next/static/chunks/framework-*',
+        'C:/my/windows/project/dir/.next/static/chunks/framework.*',
+        'C:/my/windows/project/dir/.next/static/chunks/main-*',
+        'C:/my/windows/project/dir/.next/static/chunks/polyfills-*',
+        'C:/my/windows/project/dir/.next/static/chunks/webpack-*',
+      ],
+    });
+  })
 });