Firebase CLI setup - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

Understanding Firebase CLI Authentication

What happens when you run firebase login for the first time?

A It opens a browser window to authenticate your Google account and stores credentials locally.

B It immediately creates a new Firebase project without authentication.

C It installs Firebase CLI globally without asking for credentials.

D It deletes all existing Firebase projects linked to your account.

💡 Hint

Think about how CLI tools usually authenticate users with cloud services.

Running firebase login opens a browser for Google sign-in and saves your credentials locally for future commands.

❓ Configuration

intermediate

Correct Firebase Project Initialization Command

You want to initialize a Firebase project in your local folder. Which command correctly starts this process?

A firebase init

B firebase start

C firebase create

D firebase deploy

💡 Hint

Initialization usually means setting up configuration files.

firebase init sets up Firebase configuration files and services in your project folder.

❓ Architecture

advanced

Firebase CLI and Multiple Projects

You have two Firebase projects and want to switch between them using Firebase CLI. What is the best way to manage this?

A Change the project ID manually in the <code>.firebaserc</code> file without CLI commands.

B Delete one project and recreate it with the other name.

C Run <code>firebase login</code> again for each project.

D Use <code>firebase use --add</code> to add and switch between projects locally.

💡 Hint

Think about how CLI tools handle multiple environments or projects.

firebase use --add lets you add multiple projects and switch between them easily in your local setup.

❓ security

advanced

Firebase CLI Token Usage for CI/CD

For automated deployment in a CI/CD pipeline, which Firebase CLI authentication method is recommended?

A Store your Google password in plain text in the pipeline configuration.

B Run <code>firebase login</code> interactively on the CI server.

C Use a Firebase CI token generated by <code>firebase login:ci</code> and set it as an environment variable.

D Use the <code>firebase logout</code> command before deployment.

💡 Hint

Interactive login is not possible in automated pipelines.

Generating a CI token with firebase login:ci allows secure non-interactive authentication in pipelines.

❓ service_behavior

expert

Effect of Running 'firebase deploy' Without Initialization

What happens if you run firebase deploy in a folder that has no Firebase project initialized?

A It automatically creates a new Firebase project and deploys default settings.

B The CLI shows an error saying no Firebase project is configured and stops deployment.

C It deploys to the last used Firebase project regardless of the current folder.

D It deletes all Firebase projects linked to your account.

💡 Hint

Think about what is needed before deploying with Firebase CLI.

Without initialization, Firebase CLI cannot find project settings and will show an error to prevent accidental deployment.