kolodny/immutability-helper

Health v2 · maintenance only

Adoption not part of the score

5184 stars · 185 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

A small TypeScript/JavaScript library that lets you apply mutations ($push, $set, $merge, etc.) to a copy of your data while leaving the original untouched. It is a drop-in replacement for React's deprecated react-addons-update and is commonly used for immutable state updates in React apps.

Use cases

• update nested state immutably in React
• replace deep-copy boilerplate when changing nested objects
• push items to an array without mutating the original
• implement fast shouldComponentUpdate with immutable data
• migrate from react-addons-update
• merge objects into nested state without side effects

When to choose

• you need lightweight immutable updates without changing your data representation
• you want a drop-in replacement for react-addons-update
• you use React and want cheap reference-equality change detection
• you find Immutable.js too heavy or want plain JS objects

When to avoid

• you want persistent data structures with structural sharing (use Immutable.js)
• you use Immer's produce-style drafts and prefer that API
• your project needs active development and frequent releases
• you need deep immutability enforcement rather than copy-on-write helpers

Facets

library · maturity maintenance

serialization developer-tools frontend web-development browser cross-platform immutability immutable-data state-management react typescript javascript nodejs

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