Using parameters for minInstances runtime option fails during deployment with ESM (v7.0.0) #1775
Description
Using a parameterized config value in an ESM project for a function's minInstances runtime option fails to deploy with a CEL expression 'params.MY_PARAMETER' is of an unsupported form error. It works in v6.6.0 and below and also works if you change your project to CommonJS.
Version info
node: 24.11.1
firebase-functions: 7.0.0
firebase-tools: 14.26.0
firebase-admin: N/A
Test case
With "type": "module" in your package.json:
import { onRequest } from "firebase-functions/https";
import { defineInt } from "firebase-functions/params";
const CRITICAL_HOT_INSTANCES = defineInt('CRITICAL_HOT_INSTANCES', {
description: 'How many instances to keep hot for critical functions?',
default: 0,
});
export const exampleFunc = onRequest({ minInstances: CRITICAL_HOT_INSTANCES },
(req, res) => {
res.send("Hello, world!");
}
);Steps to reproduce
Deploy the function using Firebase CLI: firebase deploy --only functions:exampleFunc
Expected behavior
Function deploys with minInstances set by the parameter.
Actual behavior
$ firebase deploy --only functions:exampleFunc
=== Deploying to 'dev'...
i deploying functions
Running command: pnpm run build
> [email protected] build /Users/user/projects/functions-bug
> tsc
✔ functions: Finished running predeploy script.
i functions: preparing codebase default for deployment
i functions: ensuring required API cloudfunctions.googleapis.com is enabled...
i functions: ensuring required API cloudbuild.googleapis.com is enabled...
i artifactregistry: ensuring required API artifactregistry.googleapis.com is enabled...
i functions: Loading and analyzing source code for codebase default to determine what to deploy
Serving at port 8857
i extensions: ensuring required API firebaseextensions.googleapis.com is enabled...
i functions: Loaded environment variables from .env, .env.dev.
Error: CEL expression 'params.CRITICAL_HOT_INSTANCES' is of an unsupported form
Note that deployment halts immediately and no firebase-debug.log is produced.