Create the next immutable state by mutating the current one
28,982
stars
1,506
commits
JavaScript
primary language
Sep 11, 2026
updated
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
You can use Gitpod (a free online VSCode like IDE) for contributing online. With a single click it will launch a workspace and automatically:
yarn run start.so that you can start coding straight away.
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!
(top 30 of 206)
JavaScript
52.1%
TypeScript
25.1%
MDX
15.5%
HTML
7.0%
Create the next immutable state by mutating the current one
28,982
stars
1,506
commits
JavaScript
primary language
Sep 11, 2026
updated
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
You can use Gitpod (a free online VSCode like IDE) for contributing online. With a single click it will launch a workspace and automatically:
yarn run start.so that you can start coding straight away.
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!
(top 30 of 206)
JavaScript
52.1%
TypeScript
25.1%
MDX
15.5%
HTML
7.0%