FIREBASE_DATABASE_EMULATOR_HOST environment variable with IP address errors and exits application

[Zakpak0]

[REQUIRED] Step 2: Describe your environment

• Operating System version: Windows 11 Pro
• Firebase SDK version: firebase.google.com/go/v4
• Library version: _____
• Firebase Product: database

[REQUIRED] Step 3: Describe the problem

Setting the FIREBASE_DATABASE_EMULATOR_HOST environment variable with an IP address errors and exit's the application.

Steps to reproduce:

Create an application using the firebase sdk for golang
Load FIREBASE_DATABASE_EMULATOR_HOST={IP_ADDRESS} into your environment
The application should crash

Relevant Code:

package firebase

import (
	"context"
	"log"
	"os"

	fb "firebase.google.com/go/v4"
	"google.golang.org/api/option"
)

func Firebase(ctx context.Context) *fb.App {
	db := os.Getenv("DATABASE_URL")
	if db == "" {
		log.Fatal("Error loading DATABASE_URL from .env file")
	}
	pid := os.Getenv("PROJECT_ID")
	if pid == "" {
		log.Fatal("Error loading PROJECT_ID from .env file")
	}
	config := &fb.Config{
		DatabaseURL: db,
		ProjectID:   pid,
	}
	env := os.Getenv("APP_ENV")
	var opt option.ClientOption
	if env == "development" {
		cred := os.Getenv("FIREBASE_CONFIG")
		if cred == "" {
			log.Fatal("Error loading FIREBASE_CONFIG from .env file")
		}
		opt = option.WithCredentialsFile(cred)
	}
	if value := os.Getenv("FIRESTORE_EMULATOR_HOST"); value != "" {
		log.Printf("Using Firestore Emulator: %s", value)
		app, err := fb.NewApp(ctx, config, opt)
		if err != nil {
			log.Fatalln(err)
		}
		return app
	} else {
		app, err := fb.NewApp(ctx, config)
		if err != nil {
			log.Fatalln(err)
		}
		return app
	}
}

[JustinTrvz]

config := &firebase.Config{
       ProjectID:     "<project-id>",
       DatabaseURL:   "localhost:9000/?ns=<project-id>",
}

You can try this as a workaround as long as the fix is not implemented.