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immerjs

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immer
Create the next immutable state by mutating the current one

JavaScript · 28980 stars

Beginner friendly Everything

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Docs: Chinese (zh-CN) website translation is outdated vs English docs Open

Difficulty 4/5 3-5 days Newbie friendliness 55/100

immerjs/immer#1242 · 5 comments · Opened May 16, 2026
Branding Drafts on Type level Open

question

Difficulty 5/5 Over a week Newbie friendliness 35/100

immerjs/immer#1232 · Opened May 4, 2026
WritableDraft flattens variadic tuples into plain arrays, losing tuple structure Open

Difficulty 3/5 1-2 days Newbie friendliness 52/100

immerjs/immer#1230 · 2 comments · 2 reactions · Opened Apr 10, 2026
Automated documentation translations — Dutch + updated Chinese demo Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

immerjs/immer#1217 · 1 comment · Opened Mar 24, 2026
[Feature Request] Support for "Splice" patches in arrays for CRDT/Y.js integration (and others) Open

proposal

Difficulty 5/5 Over a week Newbie friendliness 25/100

immerjs/immer#1202 · 2 comments · 1 reaction · Opened Jan 3, 2026
Suggestion: Add notify method to allow signal based reactivity Open

proposal

Difficulty 4/5 3-5 days Newbie friendliness 45/100

immerjs/immer#1189 · 1 reaction · Opened Nov 18, 2025
Unexpected undefined not assigned Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

immerjs/immer#1160 · 2 comments · Opened Aug 15, 2025
isModified helper Open

proposal

Difficulty 5/5 Over a week Newbie friendliness 35/100

immerjs/immer#1153 · 1 comment · Opened Jan 3, 2025
Immer modifies `readonly` properties of nested instances that are not immerable Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

immerjs/immer#1148 · Opened Oct 14, 2024
How do I flag some properties in initial state for useImmerReducer as private or with any other modifier Open

question

Difficulty 4/5 3-5 days Newbie friendliness 25/100

immerjs/immer#1146 · Opened Sep 30, 2024
CI Build issue patch - 'patch' is possibly 'undefined'. Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

immerjs/immer#1143 · Opened Sep 9, 2024
Please remove `process.env.NODE_ENV` in `dist/immer.mjs` Open

proposal

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

immerjs/immer#1141 · 9 comments · 5 reactions · Opened Sep 4, 2024
Issue to index generic record with generic key value in recipe due to draft wrapper Open

Difficulty 4/5 3-5 days Newbie friendliness 42/100

immerjs/immer#1135 · 2 reactions · Opened Jul 25, 2024
Proper Way To Get Current State With Immer ? Open

question

Difficulty 2/5 1-3 hours Newbie friendliness 35/100

immerjs/immer#1134 · 4 comments · Opened Jul 23, 2024
Unable to pass generic to produce for dynamic typing Open

question

Difficulty 4/5 3-5 days Newbie friendliness 25/100

immerjs/immer#1130 · Opened Jun 19, 2024
Configure rollup Open

question

Difficulty 3/5 1-2 days Newbie friendliness 25/100

immerjs/immer#1126 · 3 reactions · Opened May 26, 2024
Maybe update docs Open

question

Difficulty 3/5 1-2 days Newbie friendliness 35/100

immerjs/immer#1123 · Opened May 16, 2024
Options for older browser support in v10 (or continuing to use v9 somehow?) Open

question

Difficulty 4/5 3-5 days Newbie friendliness 25/100

immerjs/immer#1118 · 5 comments · Opened Apr 23, 2024
Array update speed Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

immerjs/immer#1117 · 1 comment · Opened Apr 17, 2024
"Maximum call stack exceeded" with circular references Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 35/100

immerjs/immer#1106 · 6 comments · Opened Mar 11, 2024
Immer patches for Array are correct, yet inefficient. Suggesting a new algorithm for optimized patches Open

proposal

Difficulty 5/5 Over a week Newbie friendliness 25/100

immerjs/immer#1052 · 1 comment · 2 reactions · Opened Jun 23, 2023
The return type of the produce method will have an additional undefined Open

question

Difficulty 3/5 1-2 days Newbie friendliness 35/100

immerjs/immer#1003 · 4 comments · Opened Dec 28, 2022
add `IsNothing()` type guard Open

proposal

Difficulty 3/5 1-2 days Newbie friendliness 35/100

immerjs/immer#988 · Opened Oct 30, 2022
Excluding a single property from Object freezing Open

issue-lacks-relevant-information question

Difficulty 4/5 3-5 days Newbie friendliness 30/100

immerjs/immer#928 · 6 comments · Opened Apr 18, 2022
An error occurs when nesting patches and changing the level of [tree structure data] Open

Difficulty 4/5 3-5 days Newbie friendliness 38/100

immerjs/immer#916 · 1 comment · Opened Mar 11, 2022
applyPatches produces same result, but should it also preserve identity? Open

question

Difficulty 5/5 Over a week Newbie friendliness 25/100

immerjs/immer#909 · 2 comments · Opened Feb 23, 2022
Reassigning to the same Date object generates new copy with empty patches Open

complexity-medium PR welcome

Difficulty 3/5 1-2 days Newbie friendliness 45/100

immerjs/immer#858 · 2 comments · Opened Oct 15, 2021
TypeScript - Recursive types: Type instantiation is excessively deep and possibly infinite - ts(2589) Open

released typescript

Difficulty 4/5 3-5 days Newbie friendliness 35/100

immerjs/immer#839 · 5 comments · 15 reactions · Opened Aug 7, 2021
TS errors for draft objects with properties that are indexed using well-known symbols Open

typescript

Difficulty 3/5 1-2 days Newbie friendliness 48/100

immerjs/immer#710 · 3 comments · 5 reactions · Opened Nov 26, 2020
Idea: forbid grabbing non draftables in strict mode Open

breaking change proposal

Difficulty 5/5 Over a week Newbie friendliness 25/100

immerjs/immer#686 · 1 comment · 1 reaction · Opened Oct 21, 2020
🎉🎉 Who is using `immer`? 🎉🎉 Open

Difficulty 1/5 Under an hour Newbie friendliness 25/100

immerjs/immer#284 · 29 comments · 57 reactions · Opened Jan 4, 2019

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