Issues

• Stack.get(NaN) returns the first item instead of the fallback

  immutable-js/immutable-js#2291 · Filter by author xu91102 opened on Sep 26, 2026

• Functional updates drop unrelated symbol properties from plain objects

  immutable-js/immutable-js#2289 · Filter by author xu91102 opened on Sep 26, 2026

• Repeat membership and equality ignore the sequence size

  immutable-js/immutable-js#2287 · Filter by author xu91102 opened on Sep 26, 2026

• Update function does not work with __proto__ key

  immutable-js/immutable-js#2283 · Filter by author olivercoad opened on Sep 7, 2026

• Feature request: argMinBy

  immutable-js/immutable-js#2221 · Filter by author tobiasBora opened on Jun 17, 2026
  2

• MultiSets

  Feature

  immutable-js/immutable-js#2216 · Filter by author tobiasBora opened on Jun 11, 2026
  1

• Performance Improvements for Map

  performance
  Feature

  immutable-js/immutable-js#2201 · Filter by author cpojer opened on Jun 1, 2026
  2

• fromJS's type is missing symbols

  immutable-js/immutable-js#2197 · Filter by author KazimirPodolski opened on May 30, 2026

• Seq.Indexed.concat doesn't return Seq.Indexed with multiple collections

  immutable-js/immutable-js#2161 · Filter by author tharvik opened on Dec 12, 2025

• Make private property private instead of underscore-prefixed

  immutable-js/immutable-js#2141 · Filter by author jdeniau opened on Sep 15, 2025 · 6.0
  4

• Incompatibility with jest-mock-extended

  immutable-js/immutable-js#2137 · Filter by author eyalroth opened on Aug 10, 2025
  1

• Issue with "remove" and plain array

  immutable-js/immutable-js#2106 · Filter by author jdeniau opened on May 10, 2025

• Fix package.json warning

  immutable-js/immutable-js#2064 · Filter by author jdeniau opened on Mar 8, 2025 · 6.0

• Generate d.ts with build

  immutable-js/immutable-js#2056 · Filter by author jdeniau opened on Feb 23, 2025 · 6.0

• Migrate to full ESM

  immutable-js/immutable-js#2053 · Filter by author jdeniau opened on Feb 22, 2025 · 6.0

• Migrate codebase to Typescript

  immutable-js/immutable-js#2051 · Filter by author jdeniau opened on Feb 22, 2025 · 6.0

• Implement NotEmptyCollection definition types

  immutable-js/immutable-js#2037 · Filter by author jdeniau opened on Dec 2, 2024

• Calling toJS on the result of an Immutable map causes the Immutable map to be converted to a JS object when being passed as a prop to a React component inside of the map function

  immutable-js/immutable-js#2029 · Filter by author ender2012 opened on Oct 25, 2024
  6

• Strange edge case with Map.update(...)

  immutable-js/immutable-js#1984 · Filter by author arnfaldur opened on Feb 14, 2024
  3

• Enhancement: Custom equals

  immutable-js/immutable-js#1969 · Filter by author joshding opened on Nov 26, 2023
  8

• Extract sort function from Collection types

  immutable-js/immutable-js#1961 · Filter by author bdurrer opened on Aug 28, 2023
  7

  

• Typescript: Implement MapOf::merge

  typescript
  immutable-js/immutable-js#1960 · Filter by author jdeniau opened on Aug 28, 2023 · 5.1
  1

• support deno

  immutable-js/immutable-js#1949 · Filter by author uriva opened on Aug 1, 2023
  2

• Flow type definition outdated, not working with last year changes

  flow
  immutable-js/immutable-js#1943 · Filter by author mouton-rebelle opened on Jun 19, 2023
  1

• Record with more keys should be assignable to Record with less keys if type is a subset of the first one

  immutable-js/immutable-js#1934 · Filter by author jdeniau opened on Feb 7, 2023