rtfeldman/seamless-immutable
Immutable data structures for JavaScript which are backwards-compatible with normal JS Arrays and Objects. observed · 2026-08-28
Health v2 · maintenance only
10/100
- Activity 0
- Release rhythm 8
- Longevity 100
Flags: archived
How is this computed?
round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-09-02. Adoption (stars, forks) is never an input.
- gap_med: n/a
- age_days: 4331
- days_rel: n/a
- days_push: 1895
- n_releases_24m: 0
Adoption not part of the score
5329 stars · 197 forks observed · 2026-08-28
What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded
A JavaScript library providing immutable data structures that are backwards-compatible with normal Arrays and Objects. It wraps vanilla JS data in frozen, mutation-resistant variants usable anywhere standard objects and arrays are expected.
Use cases
- make javascript objects immutable
- prevent accidental mutation of arrays and objects
- immutable state for react components
- deep freeze nested data structures
- use immutable data with vanilla js apis
- faster deep cloning of large nested objects
When to choose
- you want immutability without changing how you use arrays and objects
- you need compatibility with functions expecting vanilla JS data structures
- you want a lightweight alternative to heavier immutable libraries
When to avoid
- you need persistent data structures with structural sharing APIs like Immutable.js
- you target browsers lacking ECMAScript 5 features
- you need actively developed library with ongoing updates
Facets
library · maturity maintenance
serialization state-management web-development frontend developer-tools browser immutable-data object-freeze backwards-compatible react-state nodejs javascript
2 sources
- readme: https://github.com/rtfeldman/seamless-immutable · fetched 2026-08-28 · f1209d99a553
- registry_npm: https://registry.npmjs.org/seamless-immutable · fetched 2026-08-29 · 05e10ff889fb
Member repositories
| Repository | Role | Health v2 |
|---|---|---|
| rtfeldman/seamless-immutable | main | 10 |
For agents
markdown · JSON · MCP: product_card(name="rtfeldman/seamless-immutable")
Data as of 2026-08-30T08:39:29.467469+00:00 · Report a problem