swork

swork is a service worker building framework intended to be a robust foundation for service worker applications. TypeScript and async functions are central to its implementation enabling increased productivity, reduced error rate and the removal of callbacks. Swork is not bundled with any middleware.

License

MIT

Installation

npm install swork

yarn add swork

Example

import { Swork, FetchContext } from "swork";
 
const app = new Swork();
 
app.use((context: FetchContext, next: () => Promise<void>)) => {
    context.response = new Response("Hello World!");
});
 
app.listen();

Middleware

Swork is a middleware framework that accepts both async and standard functions. Middleware take two parameters: context and next. The supplied context is created anew for each request and encapsulates the initiating fetch event, request and eventual response. next is a function that when invoked will execute the downstream middleware.

Async Function

app.use(async (context: FetchContext, next: () => Promise<void>) => {
    const start = performance.now();
    await next();
    const timeElapsed = (performance.now() - start).toFixed(2);
    console.log(`${context.request.method} ${context.request.url} - ${timeElapsed} ms`);
});

Standard Function

app.use((context: FetchContext, next: () => Promise<void>) => {
    const start = performance.now();
    next().then(() => {
        const timeElapsed = (performance.now() - start).toFixed(2);
        console.log(`${context.request.method} ${context.request.url} - ${timeElapsed} ms`);
    });
});

Middleware Implementations

Middleware	Description	Package	Repository
swork-router	Router middleware	npmjs	github
swork-cache	Cache strategies and events	npmjs	github
swork-link	Link separate middleware pipelines	npmjs	github
swork-claim-clients	Claim active clients	npmjs	github
swork-logger	Logs all fetch requests	npmjs	github
swork-when	Middleware branching strategies	npmjs	github

Methods

use

use(...params: Array<(Swork | Middleware | Array<(Swork | Middleware)>)>): Swork

The use method accepts a middleware. Middleware are executed in the order provided for each incoming request via a fetch event handler. use can also accept arrays of middlewares or even provide a different Swork app instance.

on

on(event: EventType, ...handlers: Array<(event: any) => Promise<void> | void>): void

Use the on method to provide any handlers to be executed during service worker events. The event type will vary based upon the event fired. On supports the following events: activate, install, message, notificationclick, notificationclose, push, pushsubscriptionchange, sync

listen

listen(): void

To initialize your Swork application, call listen. This will add the event handlers and callbacks to your service worker application.

Configuration

These properties apply globally to the Swork application.

version
The version of the service worker. Defaults to "1.0.0".

origin
The origin of the service worker. Defaults to self.location.origin.

environment
The running environment. Defaults to "production".

These configurations can be referenced through the swork module.

import { configuration } from "swork";
 
configuration.environment = "production";
console.log(configuration);
// => { version: "1.0.0", origin: "https://localhost", environment: "production" }

Notes

As service workers do not yet natively support ES6 modules, a Swork implementation is expected to be built with your preferred bundler (e.g. Webpack, Rollup)

Contact

If you are using swork or any of its related middlewares, please let me know on gitter. I am always looking for feedback or additional middleware ideas.