Fix for missing NPM dependencies

CHANGELOG.md

@@ -0,0 +1 @@
+- Address crash when starting the App Hosting emulator in certain applications (#8624)

src/emulator/apphosting/serve.ts

@@ -98,8 +98,8 @@
   }
   try {
     return await secrets.accessSecretVersion(projectId, secretId, version);
   } catch (err: any) {
     if (err?.original?.code === 403 || err?.original?.context?.response?.statusCode === 403) {
       logLabeledError(
         Emulators.APPHOSTING,
         `Permission denied to access secret ${secretId}. Use ` +
@@ -126,10 +126,10 @@
   const apphostingLocalConfig = await getLocalAppHostingConfiguration(backendRoot);
   const resolveEnv = Object.entries(apphostingLocalConfig.env).map(async ([key, value]) => [
     key,
     value.value ? value.value : await loadSecret(projectId, value.secret!),
   ]);
 
   const environmentVariablesToInject: NodeJS.ProcessEnv = {
     NODE_ENV: process.env.NODE_ENV,
     ...getEmulatorEnvs(),
     ...Object.fromEntries(await Promise.all(resolveEnv)),
@@ -165,9 +165,9 @@
     );
 
     // NOTE: Development server should not block main emulator process.
     spawnWithCommandString(startCommand, backendRoot, environmentVariablesToInject)
       .catch((err) => {
         logger.logLabeled("ERROR", Emulators.APPHOSTING, `failed to start Dev Server: ${err}`);
       })
       .then(() => logger.logLabeled("BULLET", Emulators.APPHOSTING, `Dev Server stopped`));
     return;
@@ -177,9 +177,9 @@
   logger.logLabeled("BULLET", Emulators.APPHOSTING, `starting app with: '${detectedStartCommand}'`);
 
   // NOTE: Development server should not block main emulator process.
   spawnWithCommandString(detectedStartCommand, backendRoot, environmentVariablesToInject)
     .catch((err) => {
       logger.logLabeled("ERROR", Emulators.APPHOSTING, `failed to start Dev Server: ${err}`);
     })
     .then(() => logger.logLabeled("BULLET", Emulators.APPHOSTING, `Dev Server stopped`));
 }
@@ -223,8 +223,8 @@
   if (!npmLs.stdout) {
     return;
   }
   const npmLsResults = JSON.parse(npmLs.stdout.toString().trim());
-  const dependenciesToSearch: Dependency[] = Object.values(npmLsResults.dependencies);
+  const dependenciesToSearch: Dependency[] = Object.values(npmLsResults.dependencies || {});
   const firebaseUtilPaths: string[] = [];
   for (const dependency of dependenciesToSearch) {
     if (