Immer

![npm](https://www.npmjs.com/package/immer) ![Build Status](https://github.com/immerjs/immer/actions?query=branch%3Amain) ![Coverage Status](https://coveralls.io/github/immerjs/immer?branch=main) ![code style: prettier](https://github.com/prettier/prettier) ![OpenCollective](#backers) ![OpenCollective](#sponsors) ![Gitpod Ready-to-Code](https://gitpod.io/#https://github.com/immerjs/immer)

_Create the next immutable state tree by simply modifying the current tree_

Winner of the "Breakthrough of the year" React open source award and "Most impactful contribution" JavaScript open source award in 2019

Contribute using one-click online setup

You can use Gitpod (a free online VSCode like IDE) for contributing online. With a single click it will launch a workspace and automatically:

- clone the immer repo.
- install the dependencies.
- run yarn run start.

so that you can start coding straight away.

![Open in Gitpod](https://gitpod.io/from-referrer/)

The documentation of this package is hosted at https://immerjs.github.io/immer/

Did Immer make a difference to your project? Join the open collective at https://opencollective.com/immer!

https://github.com/immerjs/immer/releases