Immutable.js saw frequent releases in 2013-2015, with peaks in 2014. Releases slowed significantly from 2016-2020. There was a resurgence of releases starting in late 2021, continuing through 2025, but with a lower overall frequency and more months with no releases. The latest entry shows no releases so far this month.
Immutable.js provides persistent immutable data structures including List, Map, Set, OrderedMap, and Stack. These structures ensure that once created, the collection cannot be altered, leading to predictable application states. Optimizations like structural sharing minimize memory usage by reusing unchanged parts of the data structure when modifications occur. This library is ideal for building robust and performant applications by simplifying state management and improving data consistency, particularly in React or similar frameworks.
Immutable.js npm package downloads show a generally increasing trend from March 2024 to August 2025, peaking in July 2025 at over 112 million. However, September 2025 shows a sharp drop, with significantly fewer downloads, likely due to incomplete data for the current month, as today is September 6th.
