Swoff — generate an offline/service-worker runtime from one config, in auditable vanilla JS (no runtime dep)

Sharing a tool I've been using: Swoff turns one swoff.config.json into an auditable service worker + client runtime — written as plain JS into your repo, so there's zero runtime dependency in your bundle (MIT, open source).

Highlights from the config surface:

- 6 caching strategies, per route

- tag-based cache invalidation

- offline mutation queue with background-sync flush

- auth: token storage, 401 interception, refresh-before-request, offline auth state

- GraphQL caching + server push

- push notifications, PWA install

Works for the bundler frameworks (React/Vue/Svelte/HTMX/Solid; Next/Nuxt/SvelteKit/TanStack Start/Astro) and no-bundler stacks (Go, Laravel, Rails, Django, Flask, plain HTML/JS — static output, no Node needed in production).

The docs site is dogfooding it — you can go offline and it keeps working.

`npx u/swoff init && npx u/swoff generate`

npm: https://www.npmjs.com/package/@swoff/cli · Source: https://github.com/iamsuudi/swoff