fix(astro): Fix import path when using external init files with default path (#10214)

Fix a bug in the Astro SDK where specifying an
external `sentry.(client|server).config.js` in the default location file
would cause a build error.

Previously, we checked for a supported file extension and instead of
adding an import statement for the path to the file, we'd only add the
file extension. So
```js
import 'mjs';
// instead of 
import 'path/to/sentry.client.config.mjs'
```

Fix the filename lookup function and adds a test to cover
regressions.

Author: Lms24

dev-packages/e2e-tests/test-applications/cloudflare-astro/astro.config.mjs

@@ -17,7 +17,8 @@ export default defineConfig({
       sourceMapsUploadOptions: {
         enabled: false,
       },
-      clientInitPath: 'sentry.client.mjs',
+      // purposefully setting the default name for client
+      // and a custom name for server to test both cases
       serverInitPath: 'sentry.server.mjs',
     }),
   ],

dev-packages/e2e-tests/test-applications/cloudflare-astro/sentry.client.mjs renamed to dev-packages/e2e-tests/test-applications/cloudflare-astro/sentry.client.config.mjs

@@ -120,10 +120,9 @@ const possibleFileExtensions = ['ts', 'js', 'tsx', 'jsx', 'mjs', 'cjs', 'mts'];
 
 function findDefaultSdkInitFile(type: 'server' | 'client'): string | undefined {
   const cwd = process.cwd();
-  return possibleFileExtensions.find(extension => {
-    const filename = path.resolve(path.join(cwd, `sentry.${type}.config.${extension}`));
-    return fs.existsSync(filename);
-  });
+  return possibleFileExtensions
+    .map(e => path.resolve(path.join(cwd, `sentry.${type}.config.${e}`)))
+    .find(filename => fs.existsSync(filename));
 }
 
 function getSourcemapsAssetsGlob(config: AstroConfig): string {

packages/astro/src/integration/index.ts

@@ -0,0 +1,41 @@
+import { vi } from 'vitest';
+
+import { sentryAstro } from '../../src/integration';
+
+vi.mock('fs', async () => {
+  const actual = await vi.importActual('fs');
+  return {
+    // @ts-expect-error - just mocking around
+    ...actual,
+    existsSync: vi.fn(p => p.endsWith('js')),
+  };
+});
+
+const updateConfig = vi.fn();
+const injectScript = vi.fn();
+const config = {
+  root: new URL('file://path/to/project'),
+  outDir: new URL('file://path/to/project/out'),
+};
+
+describe('sentryAstro integration', () => {
+  afterEach(() => {
+    vi.clearAllMocks();
+  });
+
+  it('injects client and server init scripts from default paths if they exist', () => {
+    const integration = sentryAstro({});
+
+    expect(integration.hooks['astro:config:setup']).toBeDefined();
+
+    // @ts-expect-error - the hook exists and we only need to pass what we actually use
+    integration.hooks['astro:config:setup']({ updateConfig, injectScript, config });
+
+    expect(injectScript).toHaveBeenCalledTimes(2);
+    expect(injectScript).toHaveBeenCalledWith('page', expect.stringMatching(/^import ".*\/sentry.client.config.js"/));
+    expect(injectScript).toHaveBeenCalledWith(
+      'page-ssr',
+      expect.stringMatching(/^import ".*\/sentry.server.config.js"/),
+    );
+  });
+});

packages/astro/test/integration/index.files.test.ts

@@ -239,8 +239,11 @@ describe('sentryAstro integration', () => {
     await integration.hooks['astro:config:setup']({ updateConfig, injectScript, config });
 
     expect(injectScript).toHaveBeenCalledTimes(2);
-    expect(injectScript).toHaveBeenCalledWith('page', expect.stringContaining('my-client-init-path.js'));
-    expect(injectScript).toHaveBeenCalledWith('page-ssr', expect.stringContaining('my-server-init-path.js'));
+    expect(injectScript).toHaveBeenCalledWith('page', expect.stringMatching(/^import ".*\/my-client-init-path.js"/));
+    expect(injectScript).toHaveBeenCalledWith(
+      'page-ssr',
+      expect.stringMatching(/^import ".*\/my-server-init-path.js"/),
+    );
   });
 
   it.each(['server', 'hybrid'])(