Is it possible to test a Firebase trigger locally?

user_1001866 0
Viewed 6141

Using firebase-functions with Node and exports.foo = functions.database.ref('/object').onWrite(event => {});.

I can deploy to the cloud and test just fine ... and I can easily test http-type functions locally using firebase serve --only functions.

However, I don't see a way to test triggers locally. Is it possible? How?

google-cloud-functions firebase-realtime-database firebase node.js
4 Answers

This in now possible. I finally find this clear medium post which explain how do it : https://medium.com/@moki298/test-your-firebase-cloud-functions-locally-using-cloud-functions-shell-32c821f8a5ce

To run a trigger locally, use the "functions shell" tool :

1 - My code for firestore (the medium post use RealTime Database) : 

exports.testTrigger = functions.firestore
.document('messages/{messageId}')
.onCreate((snapshot, context) => {
    let message = snapshot.data()
    return snapshot.ref.set({
        ...message,
        status : 'sent' 
    })
})

2 - I run the firebase shell functions in the terminal

firebase functions:shell

3 - I call my "testTrigger" cloud function trigger with data in parameter

testTrigger({text:"hello"})

4- My firestore database has a new "message" updated by my trigger

user_15877290

Very recently, the Firebase team published an update to the Firebase CLI the added the ability to invoke other types of triggers locally. It's documented here. Be sure you've updated your CLI to the latest version to get this new functionality: npm install -g firebase-tools@latest

user_8071260

Doug answered it in the comment. While invoking a trigger is probably useful in some cases (thanks Doug), it isn't the same as a deployed trigger, which can't be done yet.

So I'll stick with deploying remotely and watching the remote log ... good 'ole Marco Polo debugging.

user_10018660
user_2966390
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