@r1-runtime/sw

Service Worker for R1 — handles asset:// URL interception and VFS asset loading.

Features

• Asset Protocol: Intercepts asset:// URLs and serves files from VFS
• OPFS Integration: Reads files from Origin Private File System
• Automatic Registration: Registered automatically by @r1-runtime/core

Installation

npm install @r1-runtime/sw

Usage

This package is automatically used by @r1-runtime/core. You don't need to import or configure it manually.

The Service Worker is registered when you call:

import { R1Runtime } from '@r1-runtime/core';

const runtime = new R1Runtime();
await runtime.boot(); // Registers the Service Worker

What It Does

The Service Worker intercepts requests to the asset:// protocol and serves files from the Virtual File System:

// In your Rust code:
let content = std::fs::read_to_string("/app/assets/logo.png")?;

// In your frontend:
<img src="asset://localhost/app/assets/logo.png" />

The Service Worker:

1. Intercepts the asset:// request
2. Reads the file from OPFS at /app/assets/logo.png
3. Returns the file content with correct MIME type

Supported Protocols

• asset://localhost/* - Maps to VFS root /
• asset://embedded/* - Maps to embedded resources

MIME Types

The Service Worker automatically detects MIME types based on file extensions:

• .html → text/html
• .css → text/css
• .js → application/javascript
• .json → application/json
• .png → image/png
• .jpg, .jpeg → image/jpeg
• .svg → image/svg+xml
• .wasm → application/wasm
• And more...

Debugging

To see Service Worker logs, open DevTools → Application → Service Workers and check "Show console logs".

License

MIT © 2026 R1 Runtime Team