Fix bug where emulator didn't consider .env.local when discovering triggers. (#5477)

Fixes #5219.

Note that the actual fix is a one-liner. I'm adding basic integration test for dotenv and params support for the emulator.

Author: taeold

CHANGELOG.md

@@ -5,3 +5,4 @@
 - Pass `trailingSlash` from Next.js config to `firebase.json` (#5445)
 - Don't use Next.js internal redirects for the backend test (#5445)
 - Fix issue where pnpm support broke for function emulation and deployment. (#5467)
+- Fix bug where .env.local files were not picked up during function emulation. (#5477)

scripts/emulator-tests/functions/package-lock.json

@@ -6,7 +6,7 @@
   "dependencies": {
     "express": "^4.18.1",
     "firebase-admin": "^11.5.0",
-    "firebase-functions": "^3.22.0"
+    "firebase-functions": "^4.0.0"
   },
   "engines": {
     "node": "16"