Dev Guide

Setup

npm install -g firebase-tools (or via yarn) for firebase CLI

Common issues

> DEBUG:google.auth._default:Checking /Users/mattwildoer/.config/gcloud/application_default_credentials.json for explicit credentials as part of auth process...

Do the gcloud auth application-default login as suggested in the error message.

If that fails, it may be because something has mucked up which default credentials it's trying to hit. Try export GOOGLE_APPLICATION_CREDENTIALS="~/.config/gcloud/application_default_credentials.json"

Otherwise it may also help to do a firebase logout && firebase login to reset the credentials.

There was an error when calling the Cloud Function FirebaseError: Response is missing data field. FirebaseError: Response is missing data field.

Your response dict needs a field named data... - I saw this written nowhere in the offical docs

https://csiandal.medium.com/firebase-function-error-response-is-missing-data-field-2c27768e0bd

CORS

There are two ways I've figured out how to get around CORS for the sake of development.

1. open -n /Applications/Google\ Chrome.app --args --user-data-dir="/var/tmp/chrome-dev-disabled-security" --disable-web-security --disable-site-isolation-trials and use this browser window

2. Allow a bunch of requests via unsafe headers (not for production)

@https_fn.on_request(
    cors=options.CorsOptions(
        cors_origins=["*"],
        cors_methods=["get", "post"],
    )
)

firebase emulators:start