Firebase Cloud Functions deployment fails with ERR_INTERNAL_ASSERTION

[salvia34]

Environment

• Node.js: 22.x
• vike: 0.4.244
• vike-photon: latest
• @photonjs/fastify: latest
• Firebase Tools: latest
• Deployment target: Firebase Cloud Functions v2 (Node.js 22)

Configuration

src/pages/+config.ts:

import vikePhoton from "vike-photon/config";

export default {
  extends: [vikePhoton],
  photon: {
    server: {
      id: "functions/src/server/index.server.ts",
      standalone: true,
    },
  },
} satisfies Config;

functions/package.json:

{
  "type": "module",
  "main": "lib/functions/src/index.js",
  "engines": {
    "node": "22"
  }
}

functions/src/server/index.server.ts:

import Fastify from "fastify";
import { apply } from "@photonjs/fastify";

async function buildApp() {
  const fastify = Fastify({ /* ... */ });
  apply(fastify);
  return fastify;
}

export default await buildApp();

Issue Description

Development Error:
When running npm run dev, I get:

Error: unable to determine transport target for "pino-pretty"
    at fixTarget (functions/node_modules/pino/lib/transport.js:160:13)

Deployment Error:
When deploying to Firebase (firebase deploy --only functions), Firebase Tools fails to analyze the codebase:

Error [ERR_INTERNAL_ASSERTION]: This is caused by either a bug in Node.js or incorrect usage of Node.js internals.
Please open an issue with this stack trace at https://github.com/nodejs/node/issues

    at ModuleLoader.getModuleJobForRequire (node:internal/modules/esm/loader:446:7)
    at new ModuleJobSync (node:internal/modules/esm/module_job:344:34)

Error: Functions codebase could not be analyzed successfully. It may have a syntax or runtime error

Questions

1. Is vike-photon currently compatible with Firebase Cloud Functions?
   The documentation doesn't mention Firebase/Google Cloud as a supported deployment target, only Cloudflare, Vercel, and self-hosted.

2. Does standalone: true mode truly bundle ALL dependencies?
   It seems Firebase Tools is still trying to dynamically load ESM modules during its analysis phase, which suggests some dependencies or dynamic imports remain unbundled.

3. Is the pino-pretty error related to Vite's module runner?
   The error occurs because Fastify tries to initialize its logger with pino-pretty transport, which doesn't seem compatible with Vite's ESM loading mechanism.

4. Should Firebase Cloud Functions be supported?
   Firebase CF is a major serverless platform. If it's not currently supported, would it make sense to add it to the roadmap?

Workaround Attempts

• Enabled standalone: true mode
• Used export default await buildApp()
• Moved vike-photon and @photonjs/fastify to root package.json

All attempts result in the same Firebase Tools analysis error

Expected Behavior

Photon should generate a standalone bundle compatible with Firebase Cloud Functions' deployment analysis and runtime environment.

Additional Context

I'm migrating from a manual Vike integration (using renderPage() directly) to vike-photon to benefit from its serverless optimizations. The manual approach worked fine, but I was trying to adopt the recommended modern architecture.

Should I revert to manual integration, or is there a configuration I'm missing for Firebase compatibility?

Thank you very much in advance.

[magne4000]

First of all, be aware that I'm not familiar enough with Firebase Cloud Functions.

Is vike-photon currently compatible with Firebase Cloud Functions?

Currently Photon does not officially support it.

Does standalone: true mode truly bundle ALL dependencies?

This parameter is very experimental. Its support should improve over time though.

Is the pino-pretty error related to Vite's module runner?

I not familiar with pino-pretty either, that's something you probably would have to check with the team developing it. If it's not an ESM package it indeed will not work right now (and probably never)

Should Firebase Cloud Functions be supported?

I suppose yes, it will be at some point. I cannot give you an ETA though.

Note

If you like what we're doing, please take a moment to consider sponsoring us: magne4000, vikejs

[magne4000]

Should I revert to manual integration, or is there a configuration I'm missing for Firebase compatibility?

Yes you should revert to manual integration for now. I'll keep this issue opened until Photon officially supports Firebase.