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https://github.com/cloudflare/miniflare
🔥 Fully-local simulator for Cloudflare Workers. For the latest version, see https://github.com/cloudflare/workers-sdk/tree/main/packages/miniflare.
https://github.com/cloudflare/miniflare
cloudflare cloudflare-workers
Last synced: about 2 months ago
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🔥 Fully-local simulator for Cloudflare Workers. For the latest version, see https://github.com/cloudflare/workers-sdk/tree/main/packages/miniflare.
- Host: GitHub
- URL: https://github.com/cloudflare/miniflare
- Owner: cloudflare
- License: mit
- Created: 2021-05-20T09:20:13.000Z (over 3 years ago)
- Default Branch: master
- Last Pushed: 2024-03-11T10:33:18.000Z (7 months ago)
- Last Synced: 2024-04-14T22:17:10.635Z (5 months ago)
- Topics: cloudflare, cloudflare-workers
- Language: TypeScript
- Homepage: https://miniflare.dev
- Size: 5.9 MB
- Stars: 3,666
- Watchers: 34
- Forks: 198
- Open Issues: 12
-
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.md
- License: LICENSE
Awesome Lists containing this project
README
> [!WARNING]
>
> This repository is for [Miniflare 2](https://legacy.miniflare.dev/), which is
> **only receiving critical security updates.** Miniflare 2 simulated the
> Workers runtime and the rest of the Cloudflare developer platform using
> Node.js. New versions of Miniflare can be found in the
> [`workers-sdk`](https://github.com/cloudflare/workers-sdk/tree/main/packages/miniflare)
> repository, and use the
> [open-sourced](https://blog.cloudflare.com/workerd-open-source-workers-runtime/)
> Workers runtime [`workerd`](https://github.com/cloudflare/workerd). This
> practically eliminates behaviour mismatches between development and production
> deployments. We recommend you
> [migrate to Miniflare 3](https://miniflare.dev/get-started/migrating) now if
> you can. Whilst Miniflare 3 supports most of Miniflare 2's features, one key
> omission is the unit testing environment. We're actively working on adding
> support for this to Miniflare 3. Once this is supported, we're planning to
> deprecate Miniflare 2 and archive this repository.
# 🔥 Miniflare 2
**Miniflare** is a simulator for developing and testing
[**Cloudflare Workers**](https://workers.cloudflare.com/).
- 🎉 **Fun:** develop workers easily with detailed logging, file watching and
pretty error pages supporting source maps.
- 🔋 **Full-featured:** supports most Workers features, including KV, Durable
Objects, WebSockets, modules and more.
- ⚡ **Fully-local:** test and develop Workers without an internet connection.
Reload code on change quickly.
It's an alternative to `wrangler dev`, written in TypeScript, that runs your
workers in a sandbox implementing Workers' runtime APIs.
**See for more detailed documentation.**
## Features
- 📨 Fetch Events (with HTTP(S) server and manual dispatch)
- ⏰ Scheduled Events (with cron triggering and manual dispatch)
- 🔑 Variables and Secrets with `.env` Files
- 📚 Modules Support
- 📦 KV (with optional persistence)
- 🪣 R2 (with optional persistence)
- ✨ Cache (with optional persistence)
- 📌 Durable Objects (with optional persistence)
- 🌐 Workers Sites
- ✉️ WebSockets
- 🛠 Custom & Wrangler Builds Support
- ⚙️ WebAssembly Support
- 🗺 Source Map Support
- 🕸 Web Standards: Base64, Timers, Fetch, Encoding, URL, Streams, Crypto
- 📄 HTMLRewriter
- ⚡️ Live Reload on File Changes
- 📅 Compatibility Dates/Flags Support
- 🔌 Multiple Workers Support
- 🤹 Custom Jest Environment (with isolated per-test storage)
- 💪 Written in TypeScript
## Install
Miniflare is installed using npm:
```sh
$ npm install -g miniflare@2 # either globally..
$ npm install -D miniflare@2 # ...or as a dev dependency
```
## Using the CLI
```sh
$ miniflare worker.js --watch --debug
[mf:dbg] Options:
[mf:dbg] - Scripts: worker.js
[mf:dbg] Reloading worker.js...
[mf:inf] Worker reloaded! (97B)
[mf:dbg] Watching .env, package.json, worker.js, wrangler.toml...
[mf:inf] Listening on :8787
[mf:inf] - http://127.0.0.1:8787
```
## Using the API
```js
import { Miniflare } from "miniflare";
const mf = new Miniflare({
script: `
addEventListener("fetch", (event) => {
event.respondWith(new Response("Hello Miniflare!"));
});
`,
});
const res = await mf.dispatchFetch("http://localhost:8787/");
console.log(await res.text()); // Hello Miniflare!
```
## CLI Reference
```
Usage: miniflare [script] [options]
Core Options:
-h, --help Show help [boolean]
-v, --version Show version number [boolean]
-c, --wrangler-config Path to wrangler.toml [string]
--wrangler-env Environment in wrangler.toml to use [string]
--package Path to package.json [string]
-m, --modules Enable modules [boolean]
--modules-rule Modules import rule [array:TYPE=GLOB]
--compat-date Opt into backwards-incompatible changes from [string]
--compat-flag Control specific backwards-incompatible changes [array]
--usage-model Usage model (bundled by default) [string]
-u, --upstream URL of upstream origin [string]
-w, --watch Watch files for changes [boolean]
-d, --debug Enable debug logging [boolean]
-V, --verbose Enable verbose logging [boolean]
--(no-)update-check Enable update checker (enabled by default) [boolean]
--repl Enable interactive REPL [boolean]
--root Path to resolve files relative to [string]
--mount Mount additional named workers [array:NAME=PATH[@ENV]]
--name Name of service [string]
--route Route to respond with this worker on [array]
--global-async-io Allow async I/O outside handlers [boolean]
--global-timers Allow setting timers outside handlers [boolean]
--global-random Allow secure random generation outside handlers [boolean]
--actual-time Always return correct time from Date methods [boolean]
--inaccurate-cpu Log inaccurate CPU time measurements [boolean]
HTTP Options:
-H, --host Host for HTTP(S) server to listen on [string]
-p, --port Port for HTTP(S) server to listen on [number]
-O, --open Automatically open browser to URL [boolean/string]
--https Enable self-signed HTTPS (with optional cert path) [boolean/string]
--https-key Path to PEM SSL key [string]
--https-cert Path to PEM SSL cert chain [string]
--https-ca Path to SSL trusted CA certs [string]
--https-pfx Path to PFX/PKCS12 SSL key/cert chain [string]
--https-passphrase Passphrase to decrypt SSL files [string]
--(no-)cf-fetch Path for cached Request cf object from Cloudflare [boolean/string]
--live-reload Reload HTML pages whenever worker is reloaded [boolean]
Scheduler Options:
-t, --cron CRON expression for triggering scheduled events [array]
Build Options:
-B, --build-command Command to build project [string]
--build-base-path Working directory for build command [string]
--build-watch-path Directory to watch for rebuilding on changes [array]
KV Options:
-k, --kv KV namespace to bind [array]
--kv-persist Persist KV data (to optional path) [boolean/string]
R2 Options:
-r, --r2 R2 bucket to bind [array]
--r2-persist Persist R2 data (to optional path) [boolean/string]
Durable Objects Options:
-o, --do Durable Object to bind [array:NAME=CLASS[@MOUNT]]
--do-persist Persist Durable Object data (to optional path) [boolean/string]
--(no-)do-alarms Enable Durable Object alarms (enabled by default) [boolean]
Cache Options:
--(no-)cache Enable default/named caches (enabled by default) [boolean]
--cache-persist Persist cached data (to optional path) [boolean/string]
Sites Options:
-s, --site Path to serve Workers Site files from [string]
--site-include Glob pattern of site files to serve [array]
--site-exclude Glob pattern of site files not to serve [array]
Bindings Options:
-e, --env Path to .env file [string]
-b, --binding Binds variable/secret to environment [array:KEY=VALUE]
--global Binds variable/secret to global scope [array:KEY=VALUE]
--wasm WASM module to bind [array:NAME=PATH]
--text-blob Text blob to bind [array:NAME=PATH]
--data-blob Data blob to bind [array:NAME=PATH]
-S, --service Mounted service to bind [array:NAME=MOUNT[@ENV]]
```
## Acknowledgements
Miniflare was created by [Brendan Coll](https://github.com/mrbbot).
Many thanks to
[dollarshaveclub/cloudworker](https://github.com/dollarshaveclub/cloudworker)
and
[gja/cloudflare-worker-local](https://github.com/gja/cloudflare-worker-local)
for inspiration.
Durable Object's transactions are implemented using Optimistic Concurrency
Control (OCC) as described in
["On optimistic methods for concurrency control." ACM Transactions on Database Systems](https://dl.acm.org/doi/10.1145/319566.319567).
Thanks to [Alistair O'Brien](https://github.com/johnyob) for helping the
Miniflare creator understand this.