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Deploying SvelteKit using Cloudflare Workers

Ashley Connor
Hi, I'm Ash! A Software Engineer from Britain, based in Toronto, Canada.
Originally published at ashleyconnor.co.uk ・3 min read

Introduction

Recently I've been using SvelteKit as the frontend for a project I've been working on and after some local development I wanted to get it up and
running on the cloud.

I chose Cloudflare Workers as I already have an account with them (this blog is hosted on Cloudflare Pages) however, the documentation on using the adapter-cloudflare-workers is pretty sparse so I'll cover how I got it deployed here.

SvelteKit adapter configuration

If you don't have an existing SvelteKit project you can follow allowing by generating the demo project:

$ npm init svelte@next my-cloudflare-workers-demo
? Which Svelte app template? › - Use arrow-keys. Return to submit.
❯   SvelteKit demo app # select this
    Skeleton project
✔ Use TypeScript? … No / Yes
✔ Add ESLint for code linting? … No / Yes
✔ Add Prettier for code formatting? … No / Yes
✔ Copied project files

$ cd my-cloudflare-workers-demo
$ npm install
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Once you're at the root of your project we can install the adapter:

$ npm i @sveltejs/adapter-cloudflare-workers@next
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Next, let's configure the adapter in our svelte.config.js:

// first import the adapter
import adapter from '@sveltejs/adapter-cloudflare-workers';

// then in the config object, add an adapter key under kit, and call the imported library
const config = {
    kit: {
        // hydrate the <div id="svelte"> element in src/app.html
        target: '#svelte',
        adapter: adapter()
    }
};
...
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That's all that's required from SvelteKit. Now onto the Cloudflare Workers configuration.

Wrangler

Configuration

To deploy to Cloudflare we will install the Wrangler CLI tool and generating an empty configuration:

$ npm i @cloudflare/wrangler -g
$ wrangler init --site my-cloudflare-workers-demo
🕵️  You can find your zone_id in the right sidebar of a zone's overview tab at https://dash.cloudflare.com
🕵️  You can find your account_id in the right sidebar of your account's Workers page
🕵️  You will need to update the following fields in the created wrangler.toml file before continuing:
- account_id
✨  Successfully scaffolded workers site
✨  Successfully created a `wrangler.toml`
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Now let's follow the instructions given and login to our Cloudflare dashboard to find our account_id.

Login and then click on the "Workers" menu item on the right-hand side of the page:

Cloudflare Workers menu item

Copy your Account ID from the sidebar:

Account ID

Optionally if you have a domain setup with Cloudflare that you wish to use with your Cloudflare Workers, grab the zone_id from your domain's dashboard.

Now edit your wrangler.toml configuration file with those values:

account_id = '4b05422c8548d995a6132421d4c31bba'
zone_id    = '2ea755fa5c01136f1d07a2013c2d1c6f' # optional, if you don't specify this a workers.dev subdomain will be used.
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Finally, we also need to make some adjustments to the site key pointing it to the directories that will be generated by running build stage later on.

site = {bucket = "./build", entry-point = "./workers-site"}
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Authorization

Next, let's authorize our Wrangler client so we can deploy our project:

$ wrangler login
Allow Wrangler to open a page in your browser? [y/n]
y
💁  Opened a link in your default browser: https://dash.cloudflare.com/wrangler?key=...
💁  Validating credentials...
✨  Successfully configured. You can find your configuration file at: /Users/ashleyconnor/.wrangler/config/default.toml
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Build our project and deploy

First, we need to build our project which we can do using npm run build:

$ npm run build

> my-cloudflare-workers-demo@0.0.1 build
> svelte-kit build

vite v2.3.7 building for production...
✓ 34 modules transformed.
...
✓ 27 modules transformed.
.svelte-kit/output/server/app.js   64.33kb
...
> Using @sveltejs/adapter-cloudflare-workers
  ✔ done
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Then run the wrangler publish command:

$ wrangler publish
up to date in 0.729s
found 0 vulnerabilities

✨  Built successfully, built project size is 33 KiB.
🌀  Created namespace for Workers Site "__my-cloudflare-workers-demo-workers_sites_assets"
✨  Success
🌀  Uploading site files
✨  Successfully published your script to
 https://my-cloudflare-workers-demo.ashconnor.workers.dev
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Your Server Side Rendered SvelteKit application should be up and running on the URL above.

You can visit the demo SvelteKit application running on Cloudflare Workers here.

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