Using locally emulated https.onCall functions in a locally hosted web application

[David Stephenson]

I am writing a Firebase application in JavaScript. I am using Firebase Cloud Functions to implement a server that receives requests for my page routes hosted by Firebase hosting and returns rendered HTML with the https.onRequest method and Express. I am also using Cloud Functions to handle server-side actions with https.onCall methods.

I develop locally using the firebase serve command. When developing locally, my client seems ignores my local onCall functions, instead calling the route for the deployed onCall functions. I am forced to deploy my onCall functions in order to see changes locally. If I do not deploy each change, my local app will not show any changes to onCall functions. This happens whether I run

firebase serve

or

firebase serve --only=hosting,functions

When run my app locally with firebase serve, the pages are generally hosted at localhost:5000, with my functions locally emulated at localhost:5001. If I call a cloud function on one of these pages, like

firebase.functions().httpsCallable('functionName')

and check the Network panel in my developer tools, I can see the Request URL is

https://us-central1-<app-name>.cloudfunctions.net/<functionName>

instead of

localhost:5001/<app-name>/us-central1/<functionName>

where my terminal says the local function is available.

Have I configured something incorrectly? How can I get my locally hosted app to use my locally emulated onCall cloud functions?

[Michael Bleigh]

We don't yet support calling locally emulated functions, but hope to support it soon. Thanks!

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[Toufeeq]

Just add this line before calling https.callable('functionName');

firebase.functions().useFunctionsEmulator('http://localhost:5001');

This will call the locally emulated function instead of hosted cloud function.