191 Configuration 7d081d7a

# Configuration

## Script Loading

```js
// Inline
new Miniflare({ modules: true, script: `export default { ... }` })

// File-based
new Miniflare({ scriptPath: 'worker.js' })

// Multi-module
new Miniflare({
  scriptPath: 'src/index.js',
  modules: true,
  modulesRules: [
    { type: 'ESModule', include: ['**/*.js'] },
    { type: 'Text', include: ['**/*.txt'] },
  ],
})
```

## Compatibility

```js
new Miniflare({
  compatibilityDate: '2026-01-01', // Use recent date for latest features
  compatibilityFlags: [
    'nodejs_compat', // Node.js APIs (process, Buffer, etc)
    'streams_enable_constructors', // Stream constructors
  ],
  upstream: 'https://example.com', // Fallback for unhandled requests
})
```

**Critical:** Use `compatibilityDate: "2026-01-01"` or latest to match production runtime. Old dates limit available APIs.

## HTTP Server & Request.cf

```js
new Miniflare({
  port: 8787, // Default: 8787
  host: '127.0.0.1',
  https: true, // Self-signed cert
  liveReload: true, // Auto-reload HTML

  cf: true, // Fetch live Request.cf data (cached)
  // cf: "./cf.json",      // Or load from file
  // cf: { colo: "DFW" },  // Or inline mock
})
```

**Note:** For tests, use `dispatchFetch()` (no port conflicts).

## Storage Bindings

```js
new Miniflare({
  // KV
  kvNamespaces: ['TEST_NAMESPACE', 'CACHE'],
  kvPersist: './kv-data', // Optional: persist to disk

  // R2
  r2Buckets: ['BUCKET', 'IMAGES'],
  r2Persist: './r2-data',

  // Durable Objects
  modules: true,
  durableObjects: {
    COUNTER: 'Counter', // className
    API_OBJECT: { className: 'ApiObject', scriptName: 'api-worker' },
  },
  durableObjectsPersist: './do-data',

  // D1
  d1Databases: ['DB'],
  d1Persist: './d1-data',

  // Cache
  cache: true, // Default
  cachePersist: './cache-data',
})
```

## Bindings

```js
new Miniflare({
  // Environment variables
  bindings: {
    SECRET_KEY: 'my-secret-value',
    API_URL: 'https://api.example.com',
    DEBUG: true,
  },

  // Other bindings
  wasmBindings: { ADD_MODULE: './add.wasm' },
  textBlobBindings: { TEXT: './data.txt' },
  queueProducers: ['QUEUE'],
})
```

## Multiple Workers

```js
new Miniflare({
  workers: [
    {
      name: 'main',
      kvNamespaces: { DATA: 'shared' },
      serviceBindings: { API: 'api-worker' },
      script: `export default { ... }`,
    },
    {
      name: 'api-worker',
      kvNamespaces: { DATA: 'shared' }, // Shared storage
      script: `export default { ... }`,
    },
  ],
})
```

**With routing:**

```js
workers: [
  { name: "api", scriptPath: "./api.js", routes: ["api.example.com/*"] },
  { name: "web", scriptPath: "./web.js", routes: ["example.com/*"] },
],
```

## Logging & Performance

```js
import { Log, LogLevel } from 'miniflare'

new Miniflare({
  log: new Log(LogLevel.DEBUG), // DEBUG | INFO | WARN | ERROR | NONE
  scriptTimeout: 30000, // CPU limit (ms)
  workersConcurrencyLimit: 10, // Max concurrent workers
})
```

## Workers Sites

```js
new Miniflare({
  sitePath: './public',
  siteInclude: ['**/*.html', '**/*.css'],
  siteExclude: ['**/*.map'],
})
```

## From wrangler.toml

Miniflare doesn't auto-read `wrangler.toml`:

```toml
# wrangler.toml
name = "my-worker"
main = "src/index.ts"
compatibility_date = "2026-01-01"
[[kv_namespaces]]
binding = "KV"
```

```js
// Miniflare equivalent
new Miniflare({
  scriptPath: 'src/index.ts',
  compatibilityDate: '2026-01-01',
  kvNamespaces: ['KV'],
})
```