immutable-js/immutable-js

Health v2 · maintenance only

Adoption not part of the score

33026 stars · 1862 forks observed · 2026-10-17

What it is AI-extracted, prompt v1, taxonomy v1, 2026-10-05, confidence 0.99

Immutable.js is a JavaScript library that provides persistent immutable collection types such as List, Map, Set, and Record. It enables efficient structural sharing and lazy evaluation for safe state management.

Use cases

• manage application state in React or Redux without mutable bugs
• implement undo/redo functionality using persistent data structures
• perform efficient updates on large nested data without copying
• share immutable data across web workers or server processes
• use structural sharing to reduce memory usage in high‑frequency updates
• handle complex data transformations with lazy Seq operations

When to choose

• you need guaranteed immutability for reliable state updates
• your project benefits from structural sharing and copy‑on‑write performance
• you are using functional programming patterns in JavaScript/TypeScript
• you require seamless conversion between plain JS objects and immutable collections

When to avoid

• the application is tiny and the overhead of immutable structures is unnecessary
• you need mutable in‑place updates for extreme performance-critical loops
• your stack already provides built‑in immutable data handling (e.g., Immer) and you want to avoid extra dependencies

Facets

library · maturity active

data-science state-management serialization web-development frontend backend browser cross-platform immutable persistent-data-structures functional-programming typescript zero-dependencies nodejs

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