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# 🔥 Miniflare
**Miniflare 3** is a simulator for developing and testing
[**Cloudflare Workers**](https://workers.cloudflare.com/), powered by
[`workerd`](https://github.com/cloudflare/workerd).
> :warning: Miniflare 3 is API-only, and does not expose a CLI. Use Wrangler
> with `wrangler dev` to develop your Workers locally with Miniflare 3.
## Quick Start
```shell
$ npm install miniflare --save-dev
```
```js
import { Miniflare } from "miniflare";
// Create a new Miniflare instance, starting a workerd server
const mf = new Miniflare({
script: `addEventListener("fetch", (event) => {
event.respondWith(new Response("Hello Miniflare!"));
})`,
});
// Send a request to the workerd server, the host is ignored
const response = await mf.dispatchFetch("http://localhost:8787/");
console.log(await response.text()); // Hello Miniflare!
// Cleanup Miniflare, shutting down the workerd server
await mf.dispose();
```
## API
### `type Awaitable<T>`
`T | Promise<T>`
Represents a value that can be `await`ed. Used in callback types to allow
`Promise`s to be returned if necessary.
### `type Json`
`string | number | boolean | null | Record<string, Json> | Json[]`
Represents a JSON-serialisable value.
### `type ModuleRuleType`
`"ESModule" | "CommonJS" | "Text" | "Data" | "CompiledWasm"`
Represents how a module's contents should be interpreted.
- `"ESModule"`: interpret as
[ECMAScript module](https://tc39.es/ecma262/#sec-modules)
- `"CommonJS"`: interpret as
[CommonJS module](https://nodejs.org/api/modules.html#modules-commonjs-modules)
- `"Text"`: interpret as UTF8-encoded data, expose in runtime with
`string`-typed `default` export
- `"Data"`: interpret as arbitrary binary data, expose in runtime with
`ArrayBuffer`-typed `default` export
- `"CompiledWasm"`: interpret as binary WebAssembly module data, expose in
runtime with `WebAssembly.Module`-typed `default` export
### `interface ModuleDefinition`
Represents a manually defined module.
- `type: ModuleRuleType`
How this module's contents should be interpreted.
- `path: string`
Path of this module. The module's "name" will be obtained by converting this
to a relative path. The original path will be used to read `contents` if it's
omitted.
- `contents?: string | Uint8Array`
Contents override for this module. Binary data should be passed as
`Uint8Array`s. If omitted, will be read from `path`.
### `interface ModuleRule`
Represents a rule for identifying the `ModuleRuleType` of automatically located
modules.
- `type: ModuleRuleType`
How to interpret modules that match the `include` patterns.
- `include: string[]`
Glob patterns to match located module paths against (e.g. `["**/*.txt"]`).
- `fallthrough?: boolean`
If `true`, ignore any further rules of this `type`. This is useful for
disabling the built-in `ESModule` and `CommonJS` rules that match `*.mjs` and
`*.js`/`*.cjs` files respectively.
### `type Persistence`
`boolean | string | undefined`
Represents where data should be persisted, if anywhere.
- If this is `undefined` or `false`, data will be stored in-memory and only
persist between `Miniflare#setOptions()` calls, not restarts nor
`new Miniflare` instances.
- If this is `true`, data will be stored on the file-system, in the `$PWD/.mf`
directory.
- If this looks like a URL, then:
- If the protocol is `memory:`, data will be stored in-memory as above.
- If the protocol is `file:`, data will be stored on the file-system, in the
specified directory (e.g. `file:///path/to/directory`). If the `unsanitise`
search parameter is `true`, path sanitisation will be disabled.
- Otherwise, if this is just a regular `string`, data will be stored on the
file-system, using the value as the directory path.
### `enum LogLevel`
`NONE, ERROR, WARN, INFO, DEBUG, VERBOSE`
Controls which messages Miniflare logs. All messages at or below the selected
level will be logged.
### `interface LogOptions`
- `prefix?: string`
String to add before the level prefix when logging messages. Defaults to `mf`.
- `suffix?: string`
String to add after the level prefix when logging messages.
### `class Log`
- `constructor(level?: LogLevel, opts?: LogOptions)`
Creates a new logger that logs all messages at or below the specified level to
the `console`.
- `error(message: Error)`
Logs a message at the `ERROR` level. If the constructed log `level` is less
than `ERROR`, `throw`s the `message` instead.
- `warn(message: string)`
Logs a message at the `WARN` level.
- `info(message: string)`
Logs a message at the `INFO` level.
- `debug(message: string)`
Logs a message at the `DEBUG` level.
- `verbose(message: string)`
Logs a message at the `VERBOSE` level.
### `class NoOpLog extends Log`
- `constructor()`
Creates a new logger that logs nothing to the `console`, and always `throw`s
`message`s logged at the `ERROR` level.
### `interface QueueConsumerOptions`
- `maxBatchSize?: number`
Maximum number of messages allowed in each batch. Defaults to `5`.
- `maxBatchTimeout?: number`
Maximum number of seconds to wait for a full batch. If a message is sent, and
this timeout elapses, a partial batch will be dispatched. Defaults to `1`.
- `maxRetries?: number`
Maximum number of times to retry dispatching a message, if handling it throws,
or it is explicitly retried. Defaults to `2`.
- `deadLetterQueue?: string`
Name of another Queue to send a message on if it fails processing after
`maxRetries`. If this isn't specified, failed messages will be discarded.
### `interface WorkerOptions`
Options for an individual Worker/"nanoservice". All bindings are accessible on
the global scope in service-worker format Workers, or via the 2nd `env`
parameter in module format Workers.
#### Core
- `name?: string`
Unique name for this worker. Only required if multiple `workers` are
specified.
- `script?: string`
JavaScript code for this worker. If this is a service worker format Worker, it
must not have any imports. If this is a modules format Worker, it must not
have any _npm_ imports, and `modules: true` must be set. If it does have
imports, `scriptPath` must also be set so Miniflare knows where to resolve
them relative to.
- `scriptPath?: string`
Path of JavaScript entrypoint. If this is a service worker format Worker, it
must not have any imports. If this is a modules format Worker, it must not
have any _npm_ imports, and `modules: true` must be set.
- `modules?: boolean | ModuleDefinition[]`
- If `true`, Miniflare will treat `script`/`scriptPath` as an ES Module and
automatically locate transitive module dependencies according to
`modulesRules`. Note that automatic location is not perfect: if the
specifier to a dynamic `import()` or `require()` is not a string literal, an
exception will be thrown.
- If set to an array, modules can be defined manually. Transitive dependencies
must also be defined. Note the first module must be the entrypoint and have
type `"ESModule"`.
- `modulesRoot?: string`
If `modules` is set to `true` or an array, modules' "name"s will be their
`path`s relative to this value. This ensures file paths in stack traces are
correct.
<!-- prettier-ignore-start -->
<!-- (for disabling `;` insertion in `js` code block) -->
- `modulesRules?: ModuleRule[]`
Rules for identifying the `ModuleRuleType` of automatically located modules
when `modules: true` is set. Note the following default rules are always
included at the end:
```js
[
{ type: "ESModule", include: ["**/*.mjs"] },
{ type: "CommonJS", include: ["**/*.js", "**/*.cjs"] },
]
```
> If `script` and `scriptPath` are set, and `modules` is set to an array,
> `modules` takes priority for a Worker's code, followed by `script`, then
> `scriptPath`.
<!-- prettier-ignore-end -->
- `compatibilityDate?: string`
[Compatibility date](https://developers.cloudflare.com/workers/platform/compatibility-dates/)
to use for this Worker. Defaults to a date far in the past.
- `compatibilityFlags?: string[]`
[Compatibility flags](https://developers.cloudflare.com/workers/platform/compatibility-dates/)
to use for this Worker.
- `bindings?: Record<string, Json>`
Record mapping binding name to arbitrary JSON-serialisable values to inject as
bindings into this Worker.
- `wasmBindings?: Record<string, string>`
Record mapping binding name to paths containing binary WebAssembly module data
to inject as `WebAssembly.Module` bindings into this Worker.
- `textBlobBindings?: Record<string, string>`
Record mapping binding name to paths containing UTF8-encoded data to inject as
`string` bindings into this Worker.
- `dataBlobBindings?: Record<string, string>`
Record mapping binding name to paths containing arbitrary binary data to
inject as `ArrayBuffer` bindings into this Worker.
- `serviceBindings?: Record<string, string | { network: Network } | { external: ExternalServer } | { disk: DiskDirectory } | (request: Request) => Awaitable<Response>>`
Record mapping binding name to service designators to inject as
`{ fetch: typeof fetch }`
[service bindings](https://developers.cloudflare.com/workers/platform/bindings/about-service-bindings/)
into this Worker.
- If the designator is a `string`, requests will be dispatched to the Worker
with that `name`.
- If the designator is an object of the form `{ network: { ... } }`, where
`network` is a
[`workerd` `Network` struct](https://github.com/cloudflare/workerd/blob/bdbd6075c7c53948050c52d22f2dfa37bf376253/src/workerd/server/workerd.capnp#L555-L598),
requests will be dispatched according to the `fetch`ed URL.
- If the designator is an object of the form `{ external: { ... } }` where
`external` is a
[`workerd` `ExternalServer` struct](https://github.com/cloudflare/workerd/blob/bdbd6075c7c53948050c52d22f2dfa37bf376253/src/workerd/server/workerd.capnp#L504-L553),
requests will be dispatched to the specified remote server.
- If the designator is an object of the form `{ disk: { ... } }` where `disk`
is a
[`workerd` `DiskDirectory` struct](https://github.com/cloudflare/workerd/blob/bdbd6075c7c53948050c52d22f2dfa37bf376253/src/workerd/server/workerd.capnp#L600-L643),
requests will be dispatched to an HTTP service backed by an on-disk
directory.
- If the designator is a function, requests will be dispatched to your custom
handler. This allows you to access data and functions defined in Node.js
from your Worker.
- `outboundService?: string | { network: Network } | { external: ExternalServer } | { disk: DiskDirectory } | (request: Request) => Awaitable<Response>`
Dispatch this Worker's global `fetch()` and `connect()` requests to the
configured service. Service designators follow the same rules above for
`serviceBindings`.
- `fetchMock?: import("undici").MockAgent`
An [`undici` `MockAgent`](https://undici.nodejs.org/#/docs/api/MockAgent) to
dispatch this Worker's global `fetch()` requests through.
> :warning: `outboundService` and `fetchMock` are mutually exclusive options.
> At most one of them may be specified per Worker.
- `routes?: string[]`
Array of route patterns for this Worker. These follow the same
[routing rules](https://developers.cloudflare.com/workers/platform/triggers/routes/#matching-behavior)
as deployed Workers. If no routes match, Miniflare will fallback to the Worker
defined first.
#### Cache
- `cache?: boolean`
If `false`, default and named caches will be disabled. The Cache API will
still be available, it just won't cache anything.
- `cacheWarnUsage?: boolean`
If `true`, the first use of the Cache API will log a warning stating that the
Cache API is unsupported on `workers.dev` subdomains.
#### Durable Objects
- `durableObjects?: Record<string, string | { className: string, scriptName?: string }>`
Record mapping binding name to Durable Object class designators to inject as
`DurableObjectNamespace` bindings into this Worker.
- If the designator is a `string`, it should be the name of a `class` exported
by this Worker.
- If the designator is an object, and `scriptName` is `undefined`, `className`
should be the name of a `class` exported by this Worker.
- Otherwise, `className` should be the name of a `class` exported by the
Worker with a `name` of `scriptName`.
#### KV
- `kvNamespaces?: Record<string, string> | string[]`
Record mapping binding name to KV namespace IDs to inject as `KVNamespace`
bindings into this Worker. Different Workers may bind to the same namespace ID
with different binding names. If a `string[]` of binding names is specified,
the binding name and KV namespace ID are assumed to be the same.
- `sitePath?: string`
Path to serve Workers Sites files from. If set, `__STATIC_CONTENT` and
`__STATIC_CONTENT_MANIFEST` bindings will be injected into this Worker. In
modules mode, `__STATIC_CONTENT_MANIFEST` will also be exposed as a module
with a `string`-typed `default` export, containing the JSON-stringified
manifest. Note Workers Sites files are never cached in Miniflare.
- `siteInclude?: string[]`
If set, only files with paths matching these glob patterns will be served.
- `siteExclude?: string[]`
If set, only files with paths _not_ matching these glob patterns will be
served.
#### R2
- `r2Buckets?: Record<string, string> | string[]`
Record mapping binding name to R2 bucket names to inject as `R2Bucket`
bindings into this Worker. Different Workers may bind to the same bucket name
with different binding names. If a `string[]` of binding names is specified,
the binding name and bucket name are assumed to be the same.
#### D1
- `d1Databases?: Record<string, string> | string[]`
Record mapping binding name to D1 database IDs to inject as `Fetcher` bindings
into this Worker. Note these bindings must be wrapped with a facade to provide
the expected `D1Database` API. Different Workers may bind to the same database
ID with different binding names. If a `string[]` of binding names is
specified, the binding name and database ID are assumed to be the same.
#### Queues
> :warning: Queues are only supported with Node.js 18 or above.
- `queueProducers?: Record<string, string> | string[]`
Record mapping binding name to queue names to inject as `WorkerQueue` bindings
into this Worker. Different Workers may bind to the same queue name with
different binding names. If a `string[]` of binding names is specified, the
binding name and queue name are assumed to be the same.
- `queueConsumers?: Record<string, QueueConsumerOptions> | string[]`
Record mapping queue name to consumer options. Messages enqueued on the
corresponding queues will be dispatched to this Worker. Note each queue can
have at most one consumer. If a `string[]` of queue names is specified,
default consumer options will be used.
#### Analytics Engine
_Not yet supported_
### `interface SharedOptions`
Options shared between all Workers/"nanoservices".
#### Core
- `host?: string`
Hostname that the `workerd` server should listen on. Defaults to `127.0.0.1`.
- `port?: number`
Port that the `workerd` server should listen on. Tries to default to `8787`,
but falls back to a random free port if this is in use. Note if a manually
specified port is in use, Miniflare throws an error, rather than attempting to
find a free port.
- `https?: boolean`
If `true`, start an HTTPS server using a pre-generated self-signed certificate
for `localhost`. Note this certificate is not valid for any other hostnames or
IP addresses. If you need to access the HTTPS server from another device,
you'll need to generate your own certificate and use the other `https*`
options below.
```shell
$ openssl req -newkey rsa:2048 -nodes -keyout key.pem -x509 -days 365 -out cert.pem
```
```js
new Miniflare({
httpsKeyPath: "key.pem",
httpsCertPath: "cert.pem",
});
```
- `httpsKey?: string`
When one of `httpsCert` or `httpCertPath` is also specified, starts an HTTPS
server using the value of this option as the PEM encoded private key.
- `httpsKeyPath?: string`
When one of `httpsCert` or `httpCertPath` is also specified, starts an HTTPS
server using the PEM encoded private key stored at this file path.
- `httpsCert?: string`
When one of `httpsKey` or `httpsKeyPath` is also specified, starts an HTTPS
server using the value of this option as the PEM encoded certificate chain.
- `httpsCertPath?: string`
When one of `httpsKey` or `httpsKeyPath` is also specified, starts an HTTPS
server using the PEM encoded certificate chain stored at this file path.
- `inspectorPort?: number`
Port that `workerd` should start a DevTools inspector server on. Visit
`chrome://inspect` in a Chromium-based browser to connect to this. This can be
used to see detailed `console.log`s, profile CPU usage, and will eventually
allow step-through debugging.
- `verbose?: boolean`
Enable `workerd`'s `--verbose` flag for verbose logging. This can be used to
see simplified `console.log`s.
- `log?: Log`
Logger implementation for Miniflare's errors, warnings and informative
messages.
- `upstream?: string`
URL to use as the origin for incoming requests. If specified, all incoming
`request.url`s will be rewritten to start with this string. This is especially
useful when testing Workers that act as a proxy, and not as origins
themselves.
- `cf?: boolean | string | Record<string, any>`
Controls the object returned from incoming `Request`'s `cf` property.
- If set to a falsy value, an object with default placeholder values will be
used
- If set to an object, that object will be used
- If set to `true`, a real `cf` object will be fetched from a trusted
Cloudflare endpoint and cached in `node_modules/.mf` for 30 days
- If set to a `string`, a real `cf` object will be fetched and cached at the
provided path for 30 days
- `liveReload?: boolean`
If `true`, Miniflare will inject a script into HTML responses that
automatically reloads the page in-browser whenever the Miniflare instance's
options are updated.
#### Cache, Durable Objects, KV, R2 and D1
- `cachePersist?: Persistence`
Where to persist data cached in default or named caches. See docs for
`Persistence`.
- `durableObjectsPersist?: Persistence`
Where to persist data stored in Durable Objects. See docs for `Persistence`.
- `kvPersist?: Persistence`
Where to persist data stored in KV namespaces. See docs for `Persistence`.
- `r2Persist?: Persistence`
Where to persist data stored in R2 buckets. See docs for `Persistence`.
- `d1Persist?: Persistence`
Where to persist data stored in D1 databases. See docs for `Persistence`.
#### Analytics Engine
_Not yet supported_
### `type MiniflareOptions`
`SharedOptions & (WorkerOptions | { workers: WorkerOptions[] })`
Miniflare accepts either a single Worker configuration or multiple Worker
configurations in the `workers` array. When specifying an array of Workers, the
first Worker is designated the entrypoint and will receive all incoming HTTP
requests. Some options are shared between all workers and should always be
defined at the top-level.
### `class Miniflare`
- `constructor(opts: MiniflareOptions)`
Creates a Miniflare instance and starts a new `workerd` server. Note unlike
Miniflare 2, Miniflare 3 _always_ starts a HTTP server listening on the
configured `host` and `port`: there are no `createServer`/`startServer`
functions.
- `setOptions(opts: MiniflareOptions)`
Updates the configuration for this Miniflare instance and restarts the
`workerd` server. Note unlike Miniflare 2, this does _not_ merge the new
configuration with the old configuration. Note that calling this function will
invalidate any existing values returned by the `Miniflare#get*()` methods,
preventing them from being used.
- `ready: Promise<URL>`
Returns a `Promise` that resolves with a `http` `URL` to the `workerd` server
once it has started and is able to accept requests.
- `dispatchFetch(input: RequestInfo, init?: RequestInit): Promise<Response>`
Sends a HTTP request to the `workerd` server, dispatching a `fetch` event in
the entrypoint Worker. Returns a `Promise` that resolves with the response.
Note that this implicitly waits for the `ready` `Promise` to resolve, there's
no need to do that yourself first. Additionally, the host of the request's URL
is always ignored and replaced with the `workerd` server's.
- `getBindings<Env extends Record<string, unknown> = Record<string, unknown>>(workerName?: string): Promise<Env>`
Returns a `Promise` that resolves with a record mapping binding names to
bindings, for all bindings in the Worker with the specified `workerName`. If
`workerName` is not specified, defaults to the entrypoint Worker.
- `getCaches(): Promise<CacheStorage>`
Returns a `Promise` that resolves with the
[`CacheStorage`](https://developers.cloudflare.com/workers/runtime-apis/cache/)
instance of the entrypoint Worker. This means if `cache: false` is set on the
entrypoint, calling methods on the resolved value won't do anything.
- `getD1Database(bindingName: string, workerName?: string): Promise<D1Database>`
Returns a `Promise` that resolves with the
[`D1Database`](https://developers.cloudflare.com/d1/platform/client-api/)
instance corresponding to the specified `bindingName` of `workerName`. Note
`bindingName` must not begin with `__D1_BETA__`. If `workerName` is not
specified, defaults to the entrypoint Worker.
- `getDurableObjectNamespace(bindingName: string, workerName?: string): Promise<DurableObjectNamespace>`
Returns a `Promise` that resolves with the
[`DurableObjectNamespace`](https://developers.cloudflare.com/workers/runtime-apis/durable-objects/#access-a-durable-object-from-a-worker)
instance corresponding to the specified `bindingName` of `workerName`. If
`workerName` is not specified, defaults to the entrypoint Worker.
- `getKVNamespace(bindingName: string, workerName?: string): Promise<KVNamespace>`
Returns a `Promise` that resolves with the
[`KVNamespace`](https://developers.cloudflare.com/workers/runtime-apis/kv/)
instance corresponding to the specified `bindingName` of `workerName`. If
`workerName` is not specified, defaults to the entrypoint Worker.
- `getQueueProducer<Body>(bindingName: string, workerName?: string): Promise<Queue<Body>>`
Returns a `Promise` that resolves with the
[`Queue`](https://developers.cloudflare.com/queues/platform/javascript-apis/)
producer instance corresponding to the specified `bindingName` of
`workerName`. If `workerName` is not specified, defaults to the entrypoint
Worker.
- `getR2Bucket(bindingName: string, workerName?: string): Promise<R2Bucket>`
Returns a `Promise` that resolves with the
[`R2Bucket`](https://developers.cloudflare.com/r2/api/workers/workers-api-reference/)
producer instance corresponding to the specified `bindingName` of
`workerName`. If `workerName` is not specified, defaults to the entrypoint
Worker.
- `dispose(): Promise<void>`
Cleans up the Miniflare instance, and shuts down the `workerd` server. Note
that after this is called, `Miniflare#setOptions()` and
`Miniflare#dispatchFetch()` cannot be called. Additionally, calling this
function will invalidate any values returned by the `Miniflare#get*()`
methods, preventing them from being used.

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const { Log } = require(".");
const log = new Log();
log.error(
[
"`miniflare@3` no longer includes a CLI. Please use `npx wrangler dev` instead.",
"As of `wrangler@3`, this will use Miniflare by default.",
"See https://miniflare.dev/get-started/migrating for more details.",
].join("\n")
);

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{
"name": "miniflare",
"version": "3.20230904.0",
"description": "Fun, full-featured, fully-local simulator for Cloudflare Workers",
"keywords": [
"cloudflare",
"workers",
"worker",
"local",
"cloudworker"
],
"homepage": "https://github.com/cloudflare/miniflare/tree/master/packages/tre#readme",
"bugs": {
"url": "https://github.com/cloudflare/miniflare/issues"
},
"repository": {
"type": "git",
"url": "git+https://github.com/cloudflare/miniflare.git",
"directory": "packages/tre"
},
"license": "MIT",
"author": "MrBBot <me@mrbbot.dev>",
"main": "./dist/src/index.js",
"types": "./dist/src/index.d.ts",
"files": [
"dist/src",
"bootstrap.js"
],
"dependencies": {
"acorn": "^8.8.0",
"acorn-walk": "^8.2.0",
"better-sqlite3": "^8.1.0",
"capnp-ts": "^0.7.0",
"exit-hook": "^2.2.1",
"glob-to-regexp": "^0.4.1",
"http-cache-semantics": "^4.1.0",
"kleur": "^4.1.5",
"source-map-support": "0.5.21",
"stoppable": "^1.1.0",
"undici": "^5.22.1",
"workerd": "1.20230904.0",
"ws": "^8.11.0",
"youch": "^3.2.2",
"zod": "^3.20.6"
},
"devDependencies": {
"@cloudflare/kv-asset-handler": "^0.3.0",
"@cloudflare/workers-types": "^4.20230807.0",
"@types/better-sqlite3": "^7.6.2",
"@types/debug": "^4.1.7",
"@types/estree": "^1.0.0",
"@types/glob-to-regexp": "^0.4.1",
"@types/http-cache-semantics": "^4.0.1",
"@types/set-cookie-parser": "^2.4.2",
"@types/source-map-support": "^0.5.6",
"@types/stoppable": "^1.1.1",
"@types/ws": "^8.5.3",
"devalue": "^4.3.0",
"devtools-protocol": "^0.0.1182435",
"semiver": "^1.1.0"
},
"engines": {
"node": ">=16.13"
},
"volta": {
"extends": "../../package.json"
},
"publishConfig": {
"access": "public"
}
}