Blog Releases Introduction

Getting Started

Installation Usages Concepts Using Mutative with React Performance

Advanced Guides

Auto Freeze Currying Marking data structure Patches Strict Mode TypeScript Pitfalls Performance tips Migration from Immer to Mutative Migration from Mutative v1 to v2

create()apply()makeCreator()current()original()rawReturn()unsafe()isDraftable()isDraft()markSimpleObject()Type casts

Comparison with Immer FAQ Contributing Mutative Ecosystem Who Uses Mutative Shared References Production error codes

Extra Topics

How Mutative compares with Immer, answers to common questions, the ecosystem, production error codes and more.

Comparison with Immer

Every difference between Mutative and Immer 11.1.18 in APIs, defaults, drafts and patches, and the behaviors that both share.

FAQ

Answers to common questions about Mutative, its performance, migration from Immer, arrays, Maps and Sets.

Contributing

Set up the repository, run its checks, and contribute code, benchmarks and docs.

Mutative Ecosystem

Libraries built on Mutative for React, Zustand, Jotai, XState, Yjs, undo and redo, and more.

Who Uses Mutative

Open-source projects that replaced Immer with Mutative, and what they reported.

Shared References

How Mutative drafts an object that several paths of the state lead to, and how to keep it shared.

Production error codes

Decode minified Mutative production errors, and find the errors and warnings of development builds.

Last updated on October 12, 2026 by unadlib

Type casts

castDraft(), castImmutable() and castMutable() change the TypeScript type of a value, and return the value as it is.

Comparison with Immer

Every difference between Mutative and Immer 11.1.18 in APIs, defaults, drafts and patches, and the behaviors that both share.