NodeJS 16 decommissioned in January

Runtime	Generation	Runtime ID	Stacks	Runtime base image	Deprecation	Decommission
Node.js 22 (preview only)	Run functions	nodejs22	google-22-full	google-22-full/nodejs22	2027-04-30	2028-10-31
Node.js 20	1st gen, Run functions	nodejs20	google-22-full	google-22-full/nodejs20	2026-04-30	2026-10-30
Node.js 18	1st gen, Run functions	nodejs18	google-22-full	google-22-full/nodejs18	2025-04-30	2025-10-30
Node.js 16	1st gen, Run functions	nodejs16	google-18-full	google-18-full/nodjes16	2024-01-30	2025-01-30
Node.js 14	1st gen, Run functions	nodejs14	google-18-full	google-18-full/nodjes14	2024-01-30	2025-01-30

Currently, if you switch to NodeJS 18 and run the emulator, you will run into an error caused by esbuild.

$ nvm use 18
$ nx build functions
$ node node_modules/firebase-tools/lib/bin/firebase.js emulators:start
i  emulators: Starting emulators: auth, functions, firestore, database, hosting, pubsub, storage, eventarc
i  firestore: Firestore Emulator logging to firestore-debug.log
✔  firestore: Firestore Emulator UI websocket is running on 9150.
i  database: Database Emulator logging to database-debug.log
i  pubsub: Pub/Sub Emulator logging to pubsub-debug.log
i  hosting[nx-firebase-proj]: Serving hosting files from: packages/nx-firebase-proj-app/public
✔  hosting[nx-firebase-proj]: Local server: http://127.0.0.1:5000
i  ui: Emulator UI logging to ui-debug.log
i  functions: Watching "/home/exac/example-org/dist/packages/functions" for Cloud Functions...
⚠  functions: package.json indicates an outdated version of firebase-functions. Please upgrade using npm install --save firebase-functions@latest in your functions directory.
⚠  functions: Please note that there will be breaking changes when you upgrade.
⚠  functions: Your requested "node" version "16" doesn't match your global version "18". Using node@18 from host.
i  functions: Loaded environment variables from .env, .env.local.
Serving at port 8424

Error: Dynamic require of "util" is not supported
    at file:///home/exac/example-org/dist/packages/functions/main.js:12:9
    at node_modules/firebase-functions/lib/logger/index.js (file:///home/exac/example-org/dist/packages/functions/main.js:465:18)
    at __require2 (file:///home/exac/example-org/dist/packages/functions/main.js:15:51)
    at node_modules/firebase-functions/lib/params/types.js (file:///home/exac/example-org/dist/packages/functions/main.js:549:19)
    at __require2 (file:///home/exac/example-org/dist/packages/functions/main.js:15:51)
    at node_modules/firebase-functions/lib/params/index.js (file:///home/exac/example-org/dist/packages/functions/main.js:872:19)
    at __require2 (file:///home/exac/example-org/dist/packages/functions/main.js:15:51)
    at node_modules/firebase-functions/lib/common/encoding.js (file:///home/exac/example-org/dist/packages/functions/main.js:960:20)
    at __require2 (file:///home/exac/example-org/dist/packages/functions/main.js:15:51)
    at node_modules/firebase-functions/lib/v2/providers/https.js (file:///home/exac/example-org/dist/packages/functions/main.js:43834:22)

⬢  functions: Failed to load function definition from source: FirebaseError: Functions codebase could not be analyzed successfully. It may have a syntax or runtime error

┌─────────────────────────────────────────────────────────────┐
│ ✔  All emulators ready! It is now safe to connect your app. │
│ i  View Emulator UI at http://127.0.0.1:4000/               │
└─────────────────────────────────────────────────────────────┘

One possible fix is to modify the packages/functions/project.json:

{
  "targets": {
    "build": {
      "executor": "@nx/esbuild:esbuild",
      "options": {
        "esbuildOptions": {
          "banner":{
             "js":"const require = (await import('node:module')).createRequire(import.meta.url);const __filename = (await import('node:url')).fileURLToPath(import.meta.url);const __dirname = (await import('node:path')).dirname(__filename);"
            }
        }
      }
    }
  }
}

That said, this is with just the basic helloWorld example function uncommented, and initializeApp imported and called. I'm not sure if there are more issues with a more complex app.

simondotm / nx-firebase

NodeJS 16 decommissioned in January #248