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+[type-definitions]: https://github.com/facebook/jest/blob/main/packages/jest-types/src/Circus.ts
+
+<h1 align="center">
+  <img src="https://jestjs.io/img/jest.png" height="150" width="150"/>
+  <img src="https://jestjs.io/img/circus.png" height="150" width="150"/>
+  <p align="center">jest-circus</p>
+  <p align="center">The next-gen test runner for Jest</p>
+</h1>
+
+## Overview
+
+Circus is a flux-based test runner for Jest that is fast, maintainable, and simple to extend.
+
+Circus allows you to bind to events via an optional event handler on any [custom environment](https://jestjs.io/docs/configuration#testenvironment-string). See the [type definitions][type-definitions] for more information on the events and state data currently available.
+
+```js
+import {Event, State} from 'jest-circus';
+import NodeEnvironment from 'jest-environment-node';
+
+class MyCustomEnvironment extends NodeEnvironment {
+  //...
+
+  async handleTestEvent(event: Event, state: State) {
+    if (event.name === 'test_start') {
+      // ...
+    }
+  }
+}
+```
+
+Mutating event or state data is currently unsupported and may cause unexpected behavior or break in a future release without warning. New events, event data, and/or state data will not be considered a breaking change and may be added in any minor release.
+
+Note, that `jest-circus` test runner would pause until a promise returned from `handleTestEvent` gets fulfilled. **However, there are a few events that do not conform to this rule, namely**: `start_describe_definition`, `finish_describe_definition`, `add_hook`, `add_test` or `error` (for the up-to-date list you can look at [SyncEvent type in the types definitions][type-definitions]). That is caused by backward compatibility reasons and `process.on('unhandledRejection', callback)` signature, but that usually should not be a problem for most of the use cases.
+
+## Installation
+
+> Note: As of Jest 27, `jest-circus` is the default test runner, so you do not have to install it to use it.
+
+Install `jest-circus` using yarn:
+
+```bash
+yarn add --dev jest-circus
+```
+
+Or via npm:
+
+```bash
+npm install --save-dev jest-circus
+```
+
+## Configure
+
+Configure Jest to use `jest-circus` via the [`testRunner`](https://jestjs.io/docs/configuration#testrunner-string) option:
+
+```json
+{
+  "testRunner": "jest-circus/runner"
+}
+```
+
+Or via CLI:
+
+```bash
+jest --testRunner='jest-circus/runner'
+```