[REQUIRED] Environment info

firebase-tools:
firebase-tools: 12.1.0
"firebase-admin": "^11.8.0",
"firebase-functions": "^4.3.1"
"firebase-functions-test": "^3.1.0"

**Platform: Windows wsl (Ubuntu)
Node: v18.16.0
Python: v3.10.6
openjdk: v"11.0.19"

[REQUIRED] Test case

i have followed the exact steps in
https://firebase.google.com/docs/functions/get-started?gen=2nd&hl=ko#about_this_tutorial

[REQUIRED] Expected behavior

No error should have occured

[REQUIRED] Actual behavior

When I run firebase emulators:start

i emulators: Starting emulators: functions, firestore
⚠ functions: The following emulators are not running, calls to these services from the Functions emulator will affect production: auth, database, hosting, pubsub, storage
i firestore: Firestore Emulator logging to firestore-debug.log
✔ firestore: Firestore Emulator UI websocket is running on
9150.
i ui: Emulator UI logging to ui-debug.log
i functions: Watching "/mnt/c/Users/sunwu/Downloads/Tryagain/pythontry/functions" for Cloud Functions...
✔ functions: Using node@18 from host.
⬢ functions: Failed to load function definition from source: FirebaseError: User code failed to load. Cannot determine
backend specification

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

┌───────────┬────────────────┬─────────────────────────────────┐
│ Emulator │ Host:Port │ View in Emulator UI
│
├───────────┼────────────────┼─────────────────────────────────┤
│ Functions │ 127.0.0.1:5001 │ http://127.0.0.1:4000/functions │
├───────────┼────────────────┼─────────────────────────────────┤
│ Firestore │ 127.0.0.1:8080 │ http://127.0.0.1:4000/firestore │
└───────────┴────────────────┴─────────────────────────────────┘
Emulator Hub running at 127.0.0.1:4400
Other reserved ports: 4500, 9150

Issues? Report them at https://github.com/firebase/firebase-tools/issues and attach the *-debug.log files.

When I run firebase emulators:start --debug

firebase emulators:start --debug
[2023-05-24T00:10:55.555Z] > command requires scopes: ["email","openid","https://www.googleapis.com/auth/cloudplatformprojects.readonly","https://www.googleapis.com/auth/firebase","https://www.googleapis.com/auth/cloud-platform"]
[2023-05-24T00:10:55.556Z] > authorizing via signed-in user (sunwu5678@gmail.com)
[2023-05-24T00:10:55.604Z] openjdk version "11.0.19" 2023-04-18
OpenJDK Runtime Environment (build 11.0.19+7-post-Ubuntu-0ubuntu122.04.1)

[2023-05-24T00:10:55.605Z] OpenJDK 64-Bit Server VM (build 11.0.19+7-post-Ubuntu-0ubuntu122.04.1, mixed mode, sharing)

[2023-05-24T00:10:55.608Z] Parsed Java major version: 11
i emulators: Starting emulators: functions, firestore {"metadata":{"emulator":{"name":"hub"},"message":"Starting emulators: functions, firestore"}}
[2023-05-24T00:10:55.614Z] assigned listening specs for emulators {"user":{"hub":[{"address":"127.0.0.1","family":"IPv4","port":4400}],"ui":[{"address":"127.0.0.1","family":"IPv4","port":4000}],"logging":[{"address":"127.0.0.1","family":"IPv4","port":4500}],"firestore":[{"address":"127.0.0.1","family":"IPv4","port":8080}],"firestore.websocket":[{"address":"127.0.0.1","family":"IPv4","port":9150}]},"metadata":{"message":"assigned listening specs for emulators"}}
[2023-05-24T00:10:55.620Z] [hub] writing locator at /tmp/hub-nodejs-a4db9.json
[2023-05-24T00:10:55.625Z] late-assigned ports for functions and eventarc emulators {"user":{"hub":[{"address":"127.0.0.1","family":"IPv4","port":4400}],"ui":[{"address":"127.0.0.1","family":"IPv4","port":4000}],"logging":[{"address":"127.0.0.1","family":"IPv4","port":4500}],"firestore":[{"address":"127.0.0.1","family":"IPv4","port":8080}],"firestore.websocket":[{"address":"127.0.0.1","family":"IPv4","port":9150}],"functions":[{"address":"127.0.0.1","family":"IPv4","port":5001}],"eventarc":[{"address":"127.0.0.1","family":"IPv4","port":9299}]},"metadata":{"message":"late-assigned ports for functions and eventarc emulators"}}
⚠ functions: The following emulators are not running, calls to these services from the Functions emulator will affect production: auth, database, hosting, pubsub, storage {"metadata":{"emulator":{"name":"functions"},"message":"The following emulators are not running, calls to these services from the Functions emulator will affect production: \u001b[1mauth, database, hosting, pubsub, storage\u001b[22m"}}
[2023-05-24T00:10:55.627Z] defaultcredentials: writing to file /home/sunwu/.config/firebase/sunwu5678_gmail_com_application_default_credentials.json
[2023-05-24T00:10:55.628Z] Setting GAC to /home/sunwu/.config/firebase/sunwu5678_gmail_com_application_default_credentials.json {"metadata":{"emulator":{"name":"functions"},"message":"Setting GAC to /home/sunwu/.config/firebase/sunwu5678_gmail_com_application_default_credentials.json"}}
[2023-05-24T00:10:55.631Z] >>> [apiv2][query] GET https://firebase.googleapis.com/v1beta1/projects/nodejs-a4db9/adminSdkConfig [none]
[2023-05-24T00:10:56.042Z] <<< [apiv2][status] GET https://firebase.googleapis.com/v1beta1/projects/nodejs-a4db9/adminSdkConfig 200
[2023-05-24T00:10:56.042Z] <<< [apiv2][body] GET https://firebase.googleapis.com/v1beta1/projects/nodejs-a4db9/adminSdkConfig {"projectId":"nodejs-a4db9","storageBucket":"nodejs-a4db9.appspot.com"}
[2023-05-24T00:10:56.077Z] Ignoring unsupported arg: auto_download {"metadata":{"emulator":{"name":"firestore"},"message":"Ignoring unsupported arg: auto_download"}}
[2023-05-24T00:10:56.077Z] Ignoring unsupported arg: single_project_mode_error {"metadata":{"emulator":{"name":"firestore"},"message":"Ignoring unsupported arg: single_project_mode_error"}}
[2023-05-24T00:10:56.077Z] Starting Firestore Emulator with command {"binary":"java","args":["-Djava.net.preferIPv4Stack=true","-Dgoogle.cloud_firestore.debug_log_level=FINE","-Duser.language=en","-jar","/home/sunwu/.cache/firebase/emulators/cloud-firestore-emulator-v1.17.4.jar","--host","127.0.0.1","--port",8080,"--websocket_port",9150,"--project_id","nodejs-a4db9","--rules","/mnt/c/Users/sunwu/Downloads/Tryagain/pythontry/firestore.rules","--single_project_mode",true,"--functions_emulator","127.0.0.1:5001"],"optionalArgs":["port","webchannel_port","host","rules","websocket_port","functions_emulator","seed_from_export","project_id","single_project_mode"],"joinArgs":false} {"metadata":{"emulator":{"name":"firestore"},"message":"Starting Firestore Emulator with command {"binary":"java","args":["-Djava.net.preferIPv4Stack=true","-Dgoogle.cloud_firestore.debug_log_level=FINE","-Duser.language=en","-jar","/home/sunwu/.cache/firebase/emulators/cloud-firestore-emulator-v1.17.4.jar","--host","127.0.0.1","--port",8080,"--websocket_port",9150,"--project_id","nodejs-a4db9","--rules","/mnt/c/Users/sunwu/Downloads/Tryagain/pythontry/firestore.rules","--single_project_mode",true,"--functions_emulator","127.0.0.1:5001"],"optionalArgs":["port","webchannel_port","host","rules","websocket_port","functions_emulator","seed_from_export","project_id","single_project_mode"],"joinArgs":false}"}}
i firestore: Firestore Emulator logging to firestore-debug.log {"metadata":{"emulator":{"name":"firestore"},"message":"Firestore Emulator logging to \u001b[1mfirestore-debug.log\u001b[22m"}}
[2023-05-24T00:10:57.195Z] May 24, 2023 9:10:57 AM com.google.cloud.datastore.emulator.firestore.websocket.WebSocketServer start
INFO: Started WebSocket server on ws://127.0.0.1:9150
{"metadata":{"emulator":{"name":"firestore"},"message":"May 24, 2023 9:10:57 AM com.google.cloud.datastore.emulator.firestore.websocket.WebSocketServer start\nINFO: Started WebSocket server on ws://127.0.0.1:9150\n"}}
[2023-05-24T00:10:57.291Z] API endpoint: http://127.0.0.1:8080
{"metadata":{"emulator":{"name":"firestore"},"message":"API endpoint: http://127.0.0.1:8080\n"}}
[2023-05-24T00:10:57.292Z] If you are using a library that supports the FIRESTORE_EMULATOR_HOST environment variable, run:

export FIRESTORE_EMULATOR_HOST=127.0.0.1:8080

Dev App Server is now running.

{"metadata":{"emulator":{"name":"firestore"},"message":"If you are using a library that supports the FIRESTORE_EMULATOR_HOST environment variable, run:\n\n export FIRESTORE_EMULATOR_HOST=127.0.0.1:8080\n\nDev App Server is now running.\n\n"}}
✔ firestore: Firestore Emulator UI websocket is running on 9150. {"metadata":{"emulator":{"name":"firestore"},"message":"Firestore Emulator UI websocket is running on 9150."}}
[2023-05-24T00:10:57.362Z] Ignoring unsupported arg: auto_download {"metadata":{"emulator":{"name":"ui"},"message":"Ignoring unsupported arg: auto_download"}}
[2023-05-24T00:10:57.363Z] Ignoring unsupported arg: port {"metadata":{"emulator":{"name":"ui"},"message":"Ignoring unsupported arg: port"}}
[2023-05-24T00:10:57.364Z] Starting Emulator UI with command {"binary":"node","args":["/home/sunwu/.cache/firebase/emulators/ui-v1.11.6/server/server.js"],"optionalArgs":[],"joinArgs":false} {"metadata":{"emulator":{"name":"ui"},"message":"Starting Emulator UI with command {"binary":"node","args":["/home/sunwu/.cache/firebase/emulators/ui-v1.11.6/server/server.js"],"optionalArgs":[],"joinArgs":false}"}}
i ui: Emulator UI logging to ui-debug.log {"metadata":{"emulator":{"name":"ui"},"message":"Emulator UI logging to \u001b[1mui-debug.log\u001b[22m"}}
[2023-05-24T00:10:57.486Z] Web / API server started at 127.0.0.1:4000
{"metadata":{"emulator":{"name":"ui"},"message":"Web / API server started at 127.0.0.1:4000\n"}}
i functions: Watching "/mnt/c/Users/sunwu/Downloads/Tryagain/pythontry/functions" for Cloud Functions... {"metadata":{"emulator":{"name":"functions"},"message":"Watching "/mnt/c/Users/sunwu/Downloads/Tryagain/pythontry/functions" for Cloud Functions..."}}
[2023-05-24T00:10:57.657Z] Validating nodejs source
[2023-05-24T00:10:58.198Z] > [functions] package.json contents: {
"name": "functions",
"description": "Cloud Functions for Firebase",
"scripts": {
"serve": "firebase emulators:start --only functions",
"shell": "firebase functions:shell",
"start": "npm run shell",
"deploy": "firebase deploy --only functions",
"logs": "firebase functions:log"
},
"engines": {
"node": "18"
},
"main": "index.js",
"dependencies": {
"firebase-admin": "^11.8.0",
"firebase-functions": "^4.3.1"
},
"devDependencies": {
"firebase-functions-test": "^3.1.0"
},
"private": true
}
[2023-05-24T00:10:58.203Z] Building nodejs source
[2023-05-24T00:10:58.204Z] Failed to find version of module node: reached end of search path /mnt/c/Users/sunwu/Downloads/Tryagain/pythontry/functions/node_modules
✔ functions: Using node@18 from host.
[2023-05-24T00:10:58.215Z] Could not find functions.yaml. Must use http discovery
[2023-05-24T00:10:58.240Z] Found firebase-functions binary at '/mnt/c/Users/sunwu/Downloads/Tryagain/pythontry/functions/node_modules/.bin/firebase-functions'
[2023-05-24T00:11:02.712Z] Serving at port 8528

[2023-05-24T00:11:16.857Z] shutdown requested via /__/quitquitquit

⬢ functions: Failed to load function definition from source: FirebaseError: User code failed to load. Cannot determine backend specification {"metadata":{"emulator":{"name":"functions"},"message":"Failed to load function definition from source: FirebaseError: User code failed to load. Cannot determine backend specification"}}

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

┌───────────┬────────────────┬─────────────────────────────────┐
│ Emulator │ Host:Port │ View in Emulator UI │
├───────────┼────────────────┼─────────────────────────────────┤
│ Functions │ 127.0.0.1:5001 │ http://127.0.0.1:4000/functions │
├───────────┼────────────────┼─────────────────────────────────┤
│ Firestore │ 127.0.0.1:8080 │ http://127.0.0.1:4000/firestore │
└───────────┴────────────────┴─────────────────────────────────┘
Emulator Hub running at 127.0.0.1:4400
Other reserved ports: 4500, 9150

Issues? Report them at https://github.com/firebase/firebase-tools/issues and attach the *-debug.log files

My project Structure