Vite PWA Workbox

Welcome to the Vite PWA Workbox repository!

Vite PWA Workbox is a collection of JavaScript libraries for Progressive Web Apps.

Requirements

@vite-pwa/workbox-build and @vite-pwa/workbox-cli require Node 22.14.0 or above.

You need to install the following dependencies to run @vite-pwa/workbox-cli or use @vite-pwa/workbox-build:

• Rolldown 1.0.0 or above: if you've installed Vite 8 or above, you don't need to install Rolldown as a dependency, because Vite 8 uses Rolldown; you need to install Rolldown when using Webpack, Rspack or Rsbuild
• magicast 0.5.0 or above: when using generateSW strategy only

Breaking Changes

The following breaking changes were introduced in the packages:

• injectManifest strategy doesn't build your service worker, @vite-pwa/workbox-build just injects the manifest into your service worker
• removed service worker templates: consumer should use a custom service worker instead (using ESM notation)
• removed offline Google Analytics support
• workbox-sw not yet available (missing CDN distribution)

New features

@vite-pwa/workbox-build adds these new features:

• buildSW strategy: builds your service worker and injects the manifest into it when enabled
• dual service worker generation, with generateSW and buildSW strategies: use swType option
• dot env files support: .env, .env.local, .env.[mode], .env.[mode].local files are supported
• custom Rolldown/Vite plugins
• custom logs level configuration
• minify the service worker build, including comments (Rolldown options)
• custom code splitting chunks: now it is possible to split your service worker code into multiple chunks, not just workbox service worker modules
• new additionalManifestEntriesGenerator factory to allow use async generators to allow to defer the manifest entries generation (read and calculate revision) until required
• generateSW strategy supports configuring parallel option to allow precaching in parallel, instead of sequentially
• generateSW strategy supports configuring urlManipulation option
• build plugins for Vite, Webpack, Rspack and Rsbuild

@vite-pwa/workbox-swkit/precaching package adds these new features:

• new parallel option to allow precaching in parallel, instead of sequentially

@vite-pwa/workbox-window package adds these new features:

• exported a new esm-sw-detector subpackage export to allow to detect ESM service worker support in the browser: based on caniuse baseline specifications

The Modernized Workbox Fork (Powered by Rolldown Everywhere)

The legacy Workbox build system was designed in a different era of the web. By forking and rewriting its core internals, we've gotten rid of massive amounts of technical debt (like magicast manipulations and complex configuration layers).

• Native Bundler Performance: The new buildSW engine hooks directly into Vite 8 or Rolldown 1's native dependency graphs.
• Service Worker Code-Splitting Support: While the current vite-plugin-pwa forces the Service Worker to be built as a single monolith, the new version introduces full code-splitting support. The new engine checks if inlineWorkboxRuntime is disabled; if so, it automatically breaks down the monolith, computes the resulting dependency graphs, tracks internal synchronous imports, and guarantees that chunks are correctly structured and resolved whenever a Classic Service Worker build is targeted (either as a standalone choice or as part of the Dual Build strategy).
• Advanced Custom Chunks & Visual Graphing (Experimental): Alongside standard code-splitting, we are introducing highly experimental support for user-defined customChunks via granular configuration callbacks. The engine will dynamically map these custom allocations, resolve complex internal dependencies, and orchestrate them seamlessly. To guarantee total safety, the engine features a built-in contention layer that blocks deployment errors (such as preventing a Service Worker or its internal synchronous runtime dependencies from accidentally precaching themselves) and intercepts circular graph conflicts before they can pollute your production environments.
• Next-Gen ESM Service Worker Support: Modern browser versions natively support Service Worker registration with { type: 'module' }. To ensure compatibility with older browser versions, the new buildSW engine embraces this by offering native ESM Service Worker generation alongside an automated Dual Build strategy (or you can use the repository's esm-sw-detector). This allows you to compile a modern ESM Service Worker and a legacy Classic Service Worker fallback simultaneously from the same source. Note that this strategy requires your source code to be written using strict ESM syntax (import/export); the engine will then automatically handle the down-leveling and inject the required internal orchestration whenever the Classic asset target is compiled.
• Automatic Feature Detection: We are introducing @vite-pwa/workbox-window, which exposes a lightweight esm-sw-detector runtime utility based on verified CanIUse baseline specifications. This module determines browser capabilities on the fly to orchestrate modern asset loading.
• Bundler Agnostic Future: The separation of concerns makes the core engine completely agnostic. We will expose dedicated standalone plugins for Webpack and Rspack via unplugin. At the buildEnd phase of those bundlers, the plugin will seamlessly invoke Rolldown internally to bundle, resolve, and generate the final Service Worker.

📄 License

MIT License © 2026-PRESENT Anthony Fu