This guide will walk you through using the SvelteKit adapter for Firebase. It brings together the power of SvelteKit and Firebase Hosting, allowing you to serve your dynamic content on cloud functions while harnessing Firebase’s robust infrastructure.

Warnings to Consider

Before diving in, it’s important to note a few caveats:

• Firebase has recently introduced first-party support for Web Frameworks.
• SvelteKit support is experimental and may not support the level of integration as provided by the official team. Use it at your own risk!
• This adapter may be deprecated in the future.

Contents

• Setup
• Beta Adapter Version Compatibility
• Configuration Overview
• How it Works
• Firebase Emulator Local Testing
• Deployment
• Caveats
• FAQ

Setup

To get started, you’ll need to install the Svelte adapter for Firebase. Here’s how you can set it up in a standard SvelteKit project:

npm install --save-dev svelte-adapter-firebase

Next, add the adapter to your svelte.config.js file:

import firebase from 'svelte-adapter-firebase';
export default { 
   kit: { 
      adapter: firebase()
   }
};

You will then need to create a firebase.json file. Run:

firebase init

Finally, build your project:

npm run build

Beta Adapter Version Compatibility

The adapter has been tested with specific versions. Below are the compatible versions:

• Adapter Version 0.15.0 with SvelteKit Version 1.1.1
• Adapter Version 0.14.5 with SvelteKit Version 1.0.0-next.587
• … (and more, refer to the original documentation for a full table)

Configuration Overview

The adapter offers various options for configuration, such as esbuildBuildOptions, firebaseJsonPath, and sourceRewriteMatch. Each option allows you to modify outputs and paths, enhancing integration with Firebase Hosting.

How It Works

Think of this adapter as a post office. Just as a post office organizes and delivers your letters and packages to the right addresses, this adapter connects your SvelteKit app with Firebase. It navigates the various configurations, ensuring that the right static and server assets reach their designated destinations.

Firebase Emulator Local Testing

To test your build locally before deployment:

• Build your app: svelte-kit build
• Install Function dependencies: pnpm install --prefix functions
• Start the emulator: firebase emulators:start

Deployment

Deploying your app is simple. Just run:

firebase deploy

Caveats

• Using firebase.json:hosting[].site is preferred over firebase.json:hosting[].target.
• Cloud Function rewrites only support us-central1 region.

FAQ

Why is the Cloud Function code output to the terminal?

This is due to the adapter’s design choice. It prints out the necessary code for you to tweak as required instead of writing it directly into the index.js file.

How to handle cold starts?

If cold starts are an issue, consider using the minInstances setting to keep a few function instances warm at all times.

Troubleshooting

If you encounter any issues, consider checking the following:

• Ensure all dependencies are correctly installed.
• Confirm your firebase.json file is properly configured.
• Review the compatibility of adapter versions with SvelteKit.

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