fix: support default and reqHandler exports in Angular (#8145)

* fix: support `default` and `reqHandler` exports in Angular

Updated the export structure to ensure both `default` and `reqHandler` exports function when using Angular.

* changelog

* bump supported angular version

* changelog for version bump

---------

Co-authored-by: Leonardo Ortiz <leo@monogram.io>

CHANGELOG.md

@@ -1,3 +1,5 @@
 - Added code generation of React hooks for Data Connect
 - Genkit init improvements around gcloud login and flow input values.
 - Fixes symbol generation when uploading Unity 6 symbols to Crashlytics.
+- Fixed SSR issues in Angular 19 by adding support for default and reqHandler exports. (#8145)
+- Added Angular 19 as supported version. (#8145)

src/frameworks/angular/index.ts

@@ -36,7 +36,7 @@ export const docsUrl = "https://firebase.google.com/docs/hosting/frameworks/angu
 
 const DEFAULT_BUILD_SCRIPT = ["ng build"];
 
-export const supportedRange = "16 - 18";
+export const supportedRange = "16 - 19";
 
 export async function discover(dir: string): Promise<Discovery | undefined> {
   if (!(await pathExists(join(dir, "package.json")))) return;
@@ -243,19 +243,24 @@ exports.handle = function(req,res) {
 };\n`;
   } else if (serverOutputPath) {
     bootstrapScript = `
-    const app = new Promise((resolve) => {
+    const app = new Promise((resolve, reject) => {
       setTimeout(() => {
         const port = process.env.PORT;
         const socket = 'express.sock';
         process.env.PORT = socket;
-        
+
         ${
           serverEntry?.endsWith(".mjs")
             ? `import(\`./${serverOutputPath}/${serverEntry}\`)`
             : `Promise.resolve(require('./${serverOutputPath}/${serverEntry}'))`
-        }.then(({ app }) => {
-          process.env.PORT = port;
-          resolve(app());
+        }.then(({ default: defHandler, reqHandler, app }) => {
+          const handler = app?.() ?? reqHandler ?? defHandler;
+          if (!handler) {
+            reject(\`The file at "./${serverOutputPath}/${serverEntry}" did not export a valid request handler. Expected exports: 'app', 'default', or 'reqHandler'.\`);
+          } else {
+            process.env.PORT = port;
+            resolve(handler);
+          }
         });
       }, 0);
     });