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double-meh-sw ://

double-meh-sw is the service-worker sibling of double-meh: one worker owning what only a service worker can — a shared cache tier served to every tab, cross-tab request coalescing, transparent request bundling for pages without the library, an invalidation hub, a version-upgrade flow, and the io:fetch message transport whose requests survive page navigation.

// sw.js — bundle this, serve the output from your origin, register it with {type: 'module'}
import {install} from 'double-meh-sw/sw.js';

install({
  version: '2026.07.04',
  cache: {cacheName: 'app-shared'},
  bundler: {url: '/bundle', match: '/api/'}
});

Everything degrades to plain fetches by design — the worker is a performance adornment, never a semantic layer. Pages running double-meh keep ownership of their own bundling (io:hello client-wins); pages without it get zero-integration acceleration.

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Documentation

Deploying

• The assembly — install(options), serve order, respondWith gating, degradation rules

Modules

• Cache tier — the shared Cache API tier: serve-first, invalidation
• Coalescing — cross-tab in-flight dedup
• Bundle window — transparent micro-window bundling
• Messages — the io:* contract, client-wins, the io:fetch transport

Protocol

• The bundle wire format v1 lives in the double-meh-bundler wiki — one normative page for all three packages

Project

• Release notes