Firebase cloud function local code changes are not reflected in emulators

I have posted a question in StackOverflow. Creating a bug here as recommended by Doug Stevenson. StackOverflow Post link: https://stackoverflow.com/q/64845931/9636037

Issue details: I am trying to develop API for my apps using Firebase cloud functions. Following this (https://firebase.google.com/docs/emulator-suite) site to use the firebase emulator suite for development and testing locally.

Issue: The changes are not reflected in the locally emulated functions.

[REQUIRED] Environment info

firebase-tools: 8.16.2 Platform: Windows 10 Node: 10.15.3 (node --version)

[REQUIRED] Test case

[REQUIRED] Steps to reproduce

1. index.js code:

exports.test = functions.https.onRequest(async (request, response) => {
   response.status(200).send("First");
});

1. Successfully deployed the test method.

the command used to deploy:

firebase deploy --only functions:test

1. In Postman made the following GET request.

https://us-central1-<project-name>.cloudfunctions.net/test
Result: First
Status: 200 OK

1. Started the emulators:

firebase emulators:start --only functions

1. In Postman made the following GET request.

http://localhost:5001/<project-name>/us-central1/indexTest
Result: First
Status: 200 OK

Same as the actual deployed function.

1. Changed the function code to:

exports.test = functions.https.onRequest(async (request, response) => {
    response.status(200).send("Second");
});

1. Getting the same result as before when hitting the emulated function in the localhost. The changes are not reflected.

Also, tried stopping the emulator and starting it again. No luck.

[REQUIRED] Expected behavior

Locally emulated functions in the emulator should reflect the local code changes.

[REQUIRED] Actual behavior

The emulator is not recognizing the local code changes.

[samtstern]

@Abhimanyu14 glad it’s working!

Also you can use tsc -w to have TypeScript automatically rebuild every time you save.

[samtstern]

@Abhimanyu14 after changing your TypeScript code you have to run npm run build to compile it again. The Functions emulator looks at the compiled code which is in lib/index.js (that’s what is defined in main in package.json).

So I suspect you’re just forgetting to compile after changing the TS source.