Immer

npm Build Status Coverage Status code style: prettier OpenCollective OpenCollective Gitpod Ready-to-Code

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 VS Code 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

Documentation

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

Support

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

Release notes

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

immerjs/immer

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src=\"https://camo.githubusercontent.com/e4e3e01aa9d0e6c58de411253ad5ffd73074f989b9363a8f01d64fb62d09a662/68747470733a2f2f696d672e736869656c64732e696f2f62616467652f476974706f642d52656164792d2d746f2d2d436f64652d626c75653f6c6f676f3d676974706f64\" alt=\"Gitpod Ready-to-Code\" data-canonical-src=\"https://img.shields.io/badge/Gitpod-Ready--to--Code-blue?logo=gitpod\" style=\"max-width: 100%;\"></a></p>\n<p dir=\"auto\"><em>Create the next immutable state tree by simply modifying the current tree</em></p>\n<p dir=\"auto\">Winner of the \"Breakthrough of the year\" <a href=\"https://osawards.com/react/\" rel=\"nofollow\">React open source award</a> and \"Most impactful contribution\" <a href=\"https://osawards.com/javascript/\" rel=\"nofollow\">JavaScript open source award</a> in 2019</p>\n<div class=\"markdown-heading\" dir=\"auto\"><h2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\">Contribute using one-click online setup</h2><a id=\"user-content-contribute-using-one-click-online-setup\" class=\"anchor\" aria-label=\"Permalink: Contribute using one-click online setup\" href=\"#contribute-using-one-click-online-setup\"><svg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"><path d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"></path></svg></a></div>\n<p dir=\"auto\">You can use Gitpod (a free online VS Code like IDE) for contributing online. With a single click it will launch a workspace and automatically:</p>\n<ul dir=\"auto\">\n<li>clone the immer repo.</li>\n<li>install the dependencies.</li>\n<li>run <code>yarn run start</code>.</li>\n</ul>\n<p dir=\"auto\">so that you can start coding straight away.</p>\n<p dir=\"auto\"><a href=\"https://gitpod.io/from-referrer/\" rel=\"nofollow\"><img src=\"https://camo.githubusercontent.com/b04f5659467d23b5109ba935a40c00decd264eea25c22d50a118021349eea94f/68747470733a2f2f676974706f642e696f2f627574746f6e2f6f70656e2d696e2d676974706f642e737667\" alt=\"Open in Gitpod\" data-canonical-src=\"https://gitpod.io/button/open-in-gitpod.svg\" style=\"max-width: 100%;\"></a></p>\n<div class=\"markdown-heading\" dir=\"auto\"><h2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\">Documentation</h2><a id=\"user-content-documentation\" class=\"anchor\" aria-label=\"Permalink: Documentation\" href=\"#documentation\"><svg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"><path d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"></path></svg></a></div>\n<p dir=\"auto\">The documentation of this package is hosted at <a href=\"https://immerjs.github.io/immer/\" rel=\"nofollow\">https://immerjs.github.io/immer/</a></p>\n<div class=\"markdown-heading\" dir=\"auto\"><h2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\">Support</h2><a id=\"user-content-support\" class=\"anchor\" aria-label=\"Permalink: Support\" href=\"#support\"><svg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"><path d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"></path></svg></a></div>\n<p dir=\"auto\">Did Immer make a difference to your project? Join the open collective at <a href=\"https://opencollective.com/immer\" rel=\"nofollow\">https://opencollective.com/immer</a>!</p>\n<div class=\"markdown-heading\" dir=\"auto\"><h2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\">Release notes</h2><a id=\"user-content-release-notes\" class=\"anchor\" aria-label=\"Permalink: Release notes\" href=\"#release-notes\"><svg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"><path d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"></path></svg></a></div>\n<p dir=\"auto\"><a href=\"https://github.com/immerjs/immer/releases\">https://github.com/immerjs/immer/releases</a></p>\n</article>",
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