Where is the Cloud Functions emulator?

[Edigleysson Silva (Edy)]

I came to here from https://firebase.googleblog.com/2019/05/whats-new-Google-IO-2019.html
In this article Francis tell about Cloud Functions emulator. But I can't find it.

[Sam Stern]

@geeksilva97 thanks for asking! Right now you can read about it here:
https://firebase.google.com/docs/functions/local-emulator

We know we need many more docs/samples and we are working on those now!

[Edigleysson Silva (Edy)]

This link is very useful. Thank you!

[Lucas Reis]

I'm missing a good documentation description for what is the purpose of firestore emulator and how do I test those scenarios locally instead of manipulating data externally.

It seems to be completelly different from Rachel Myers's demonstration.

[Sam Stern]

@thereis the Firestore emulator is useful for two main things:

• Writing security rules unit tests using the @firebase/testing Node.js library
• Directly connecting your Android or iOS app to the emulator (web coming soon) similar to Rachel Myers demo.

If you have Cloud Functions that respond to Cloud Firestore triggers, those can be emulated as well.

If you want to connect your mobile apps, here's how:

Android

    // 10.0.2.2 is the special IP address for an Android Emulator
    // to access 'localhost' of the host computer
    FirebaseFirestoreSettings settings =
        new FirebaseFirestoreSettings.Builder()
                .setHost("10.0.2.2:8080")
                .setSslEnabled(false)
                .build();

    firestore.setFirestoreSettings(settings);

iOS (Swift)

let settings = Firestore.firestore().settings
settings.host = "localhost:8080"
settings.isSSLEnabled = false
Firestore.firestore().settings = settings

Make sure the emulator is running on the right port before starting your app. I hope that makes sense!

[Lucas Reis]

Thanks for the quick answer, now it makes sense for me :)

[Lucas Reis]

I have some questions that are confusing me about the emulator. Is it possible to save data inside the local firestore emulator or his functionality is only to create responses based on loaded rules?

Because I want to do some integration tests locally without reaching the production environment. It is mindblowing me because I want to test my functions without using firebase-functions-test, since it is very hard to comprehend and turn the code to "human readable".

[Sam Stern]

@thereis it emulates the whole service, so yes it's a local substitute for the backend. However it does not implement persistence so when you shut it down all data is erased.

[Sam Stern]

We published a lot of new docs since this issue was last updated so I am going to close it. For future questions please open a new issue. Thanks all!