@quilted/cloudflare

This library provides a set of runtime utilities and build configuration that can adapt Quilt apps and services to run on Cloudflare.

If you’re using Quilt’s automatic app server or HTTP request router features, configuring your projects to run on Cloudflare is pretty straightforward. We’ve written a comprehensive guide to deploying Quilt on Cloudflare that covers the necessary configuration for Quilt and Wrangler, the CLI provided by Cloudflare for deploying to their platform.

Getting the library

Install this library as a development dependency by running the following command:

``zsh
pnpm install @quilted/cloudflare --save-dev
`

Using the library

$3

The craft entry in this package includes plugins for Craft, Quilt’s tooling orchestrator. There are two plugins exported from this entry point: cloudflarePages(), for deploying an app to Cloudflare Pages, and cloudflareWorkers(), for deploying an app or service directly to Cloudflare Workers.

When included, these plugins will configure your project to run on Cloudflare’s infrastructure. This includes a few adjustments to your project’s tooling configuration:

- Build outputs are configured to be in the proper module format, with the file extension Cloudflare expects, and with all dependencies inlined
- The develop command runs your code in Miniflare to closely resemble the production Cloudflare Workers environment

In most cases, all you need to do is include the cloudflarePages() or cloudflareWorkers() plugin in your project’s quilt.project.ts file, as documented in the detailed deployment guide:

`ts
// app/quilt.project.ts

import {createProject, quiltApp} from '@quilted/craft';
import {cloudflarePages} from '@quilted/cloudflare/craft';

export default createProject((project) => {
project.use(quiltApp());
project.use(cloudflarePages());
});
`

`ts
// functions/my-function/quilt.project.ts

import {createProject, quiltService} from '@quilted/craft';
import {cloudflareWorkers} from '@quilted/cloudflare/craft';

export default createProject((project) => {
project.use(quiltService());
project.use(cloudflareWorkers());
});
`

#### Using Cloudflare’s native APIs instead of @quilted/request-router

You can also use Quilt build your project “as-is”, using Cloudflare’s native module-based APIs. You might want to do this if your worker doesn’t need the routing utilities provided by @quilted/request-router, or you want to make use of non-HTTP APIs available in Cloudflare, like scheduled events or Cloudflare Queues.

In your application code, you can write your Cloudflare Worker using its default export convention:

`ts
export default {
async fetch(request, env) {
if (request.url === '/ping') {
await env.MY_QUEUE.send({ping: true});
return new Response('pong', {status: 200});
}

return new Response('Not found', {status: 404});
},
queue(batch) {
console.log(batch);
},
};
`

You will also need to tell Quilt that you do not use @quilted/request-router. For an application, you do this by setting the server.format option of quiltApp() to 'custom':

`ts
// app/quilt.project.ts

import {createProject, quiltApp} from '@quilted/craft';
import {cloudflareWorkers} from '@quilted/cloudflare/craft';

export default createProject((project) => {
project.use(
quiltApp({
server: {format: 'custom'},
}),
cloudflareWorkers(),
);
});
`

For a service, you do this by setting the format option of quiltService() to 'custom':

`ts
// functions/my-worker/quilt.project.ts

import {createProject, quiltService} from '@quilted/craft';
import {cloudflareWorkers} from '@quilted/cloudflare/craft';

export default createProject((project) => {
project.use(
quiltService({
format: 'custom',
}),
cloudflareWorkers(),
);
});
`

Additional options are documented in code, so refer to your editor’s intellisence for details.

$3

Cloudflare offers a number of features on top of the basic fetch() API to help you write powerful backend applications. Quilt exposes two of the most important features for you use in your request handlers: access to Cloudflare “bindings”, and accessing Cloudflare’s cf object.

#### Accessing Cloudflare bindings

In a Cloudflare Worker, “bindings” let your code interact with resources on the Workers platform. This can include anything from environment variables, to the KV datastore, to Queues and more.

Quilt provides these bindings on the second context argument to a @quilted/request-router handler, nested under the env key. To get strong type-checking on these values, though, you will need to teach Quilt what bindings are available for a given project. You can do this by extending the CloudflareRequestEnvironment interface with your project’s bindings. Cloudflare provides the types of all bindings in the @cloudflare/workers-types package, so you should install this as a development dependency of your project.

`ts
import type {KVNamespace} from '@cloudflare/workers-types';
import {createRequestRouter, json} from '@quilted/request-router';

// This import adds the types for request context that is only available
// in Cloudflare Workers, like the env object for accessing bindings.
import type {} from '@quilted/cloudflare';

declare module '@quilted/cloudflare' {
interface CloudflareRequestEnvironment {
// Example of an environment variable
readonly SECRET_KEY: string;
// Example of a KV datastore
readonly DATA: KVNamespace;
}
}

const router = createRequestRouter();

router.get((request, {env}) => {
if (request.headers.get('X-Secret') !== env.SECRET_KEY) {
return new Response('Invalid secret', {status: 401});
}

return json({
data: await env.DATA.get('some-key'),
});
});

export default router;
`

#### Accessing the Cloudflare cf object

The cf object is provided by Cloudflare and provides details about the request, like geolocation of the IP address. The cf object is provided on the second context argument to a @quilted/request-router handler:

`ts
// In a file for your service, say, functions/api/api.ts

import {createRequestRouter, html} from '@quilted/request-router';

// This import adds the types for request context that is only available
// in Cloudflare Workers, like the cf object containing request metadata.
import type {} from '@quilted/cloudflare';

const router = createRequestRouter();

router.get((_, {cf}) => {
const greeting = cf?.country ? user from ${cf.country} : 'mystery user';

return html(Hello to you, ${greeting}!);
});

export default router;
`

$3

The request-router entry point exports a few utility functions for adapting request routers from @quilted/request-router to the Cloudflare Workers runtime. They are mostly used internally by @quilted/cloudflare/craft`, but might also be useful for writing more complex, custom adaptors.

All utilities from this library are documented in code.