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https://github.com/udacity/cloudflare-typescript-workers

Types and mocks for building a tested Typescript Cloudflare Worker, generates three NPM packages
https://github.com/udacity/cloudflare-typescript-workers

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Types and mocks for building a tested Typescript Cloudflare Worker, generates three NPM packages

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# Cloudflare Workers with TypeScript and Webpack



_**Retired: as of 2022, Cloudflare's official types package

[`@cloudflare/workers-types`](https://github.com/cloudflare/workers-types)

is more up-to-date and better supported.**_



[Cloudflare Workers][about-workers] allow you to run JavaScript on Cloudflare's

edge servers around the world. You can modify your site’s HTTP requests and

responses, make parallel requests, or generate responses from the edge. This

project develops, tests, and deploys NPM packages supporting the development of

Cloudflare Workers using TypeScript.



[Get started on your own TypeScript Cloudflare Worker using the

Template.][starter-template]



* [`types-cloudflare-worker`][types-cloudflare-worker] - Complete types for all

  public features provided by Cloudflare Workers. Supports the `Request.cf`

  object, the Cache API and KV API.

* [`cloudflare-worker-mock`][cloudflare-worker-mock] - Wraps

  `service-worker-mock` for name consistency, developer experience and to

  provide a simple mockable Cache API and KV API implementation.

* [`@udacity/types-service-worker-mock`][types-service-worker-mock] - Incomplete

  types for the `pinterest/service-worker-mock` to support Cloudflare Worker

  Testing. May be pushed to the NPM `@types` project in the future, but needs

  additional work before that is reasonable.



The [Cloudflare Worker API implements a subset][worker-api-reference] of the

[Service Worker API][service-worker-api] specification, therefore Service Worker

TypeScript types are a useful starting point.



[about-workers]:https://developers.cloudflare.com/workers/about/

[starter-template]:https://github.com/udacity/cloudflare-typescript-worker-template

[types-service-worker-mock]:https://www.npmjs.com/package/@udacity/types-service-worker-mock

[types-cloudflare-worker]:https://www.npmjs.com/package/types-cloudflare-worker

[cloudflare-worker-mock]:https://www.npmjs.com/package/cloudflare-worker-mock

[worker-api-reference]:https://developers.cloudflare.com/workers/reference/

[service-worker-api]:https://developer.mozilla.org/en-US/docs/Web/API/Service_Worker_API



## Example



A small example of a strictly typed worker:



```typescript

import CloudflareWorkerGlobalScope from 'types-cloudflare-worker';

declare var self: CloudflareWorkerGlobalScope;



export class Worker {

  public async handle(event: FetchEvent) {

    const originResponse = fetch(event.request, {

      cf: {

        minify: {

          html: true,

        },

      },

    });



    return originResponse;

  }

}



self.addEventListener('fetch', (event: FetchEvent) => {

  const worker = new Worker();

  event.respondWith(worker.handle(event));

});

```



## Getting started



Start with the [Starter Template][starter-template] or run the following

commands:



```bash

npm init

# Add TypeScript

npm i -D \

  typescript \

  @types/node

# Setup the Cloudflare Worker Types and Mock

npm i -D \

  @udacity/types-service-worker-mock \

  types-cloudflare-worker \

  cloudflare-worker-mock



# Init TypeScript

tsc --init

```



Set the TypeScript compiler options in `tsconfig.json`:



```js

"compilerOptions": {

  /* https://developers.cloudflare.com/workers/reference/ */

  /* Cloudflare Workers use the V8 JavaScript engine from Google Chrome. The

    * Workers runtime is updated at least once a week, to at least the version

    * that is currently used by Chrome’s stable release. This means you can

    * safely use latest JavaScript features, with no need for "transpilers".

    */

  "target": "ESNext",

  /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017','ES2018' or 'ESNEXT'. */

  "module": "commonjs",

  /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */

  "lib": ["esnext", "webworker"],

  /* Specify library files to be included in the compilation. */



  /* Recommend enabling all Strict Type-Checking Options and Additional Checks */

}

```



## Building the Worker(s)



There are two implementations of the same test worker in this repository.



### demo/src/helloworker.ts



This is the demo worker. It uses the published packages. Reference it as an

example implementation and starting point for your project.



```bash

cd demo

npm i

jest

npm run build

```



### src/helloworker.ts



This is the development worker. It uses the local packages.



```bash

npm i

jest

npm run build

```



## Testing and deploying the packages



```bash

npm i

npm run test-all

scripts/publish.sh $VERSION $OTP # New version and 2FA

```



## Author



Brad Erickson ([@13rac1](https://github.com/13rac1))



## License



Licensed under the Apache License, Version 2.0.



© 2019 Udacity, Inc.



Content derived from Cloudflare Developer Documentation. © 2019 Cloudflare, Inc.