jest-environment-node-single-context/README.md

Jest environment for Node with single context

Single-context Node.js environment for Jest
===========================================

One of Jest's key features is context isolation so tests can't have side-effects on other tests by manipulating the
global context. In theory that's a good idea but in practice the current implementation messes around with global
types in a way which breaks pretty much all instanceof checks in tests against standard types like Uint8Array for
example.

This small project provides a single-context Node.js environment which effectively sacrifices the context
isolation feature by using a single context for all tests so instanceof checks works again as expected.

See [Jest issue #2549](https://github.com/facebook/jest/issues/2549) for details.


Usage
-----

* Install dependency:

    ```
    npm install -D jest-environment-node-single-context
    ```

* Add this property to your Jest config:

    ```
    testEnvironment: "jest-environment-node-single-context"
    ```