immerjs/immer

This system is a JavaScript/TypeScript library for managing immutable state through a 'produce' pattern, allowing safe mutation of draft objects. It provides core utilities for deep copying, patch generation, and strict mode configuration, while supporting advanced data structures like Maps and Sets. The codebase is structured with a clear public API, internal modules, and comprehensive type definitions for both TypeScript and Flow. Additionally, it includes performance benchmarking tools to compare its speed against other libraries and a documentation site for user guidance.

The project modernized its build and testing infrastructure by migrating from Jest to Vitest and adopting tsup for bundling. This period also introduced comprehensive performance benchmarks and expanded type-checking tests to ensure code quality and speed.

5 changes

This period focused on modernizing the project's infrastructure by migrating the test suite to Vitest and refactoring the source code into a clear public and internal API structure. It also introduced new features such as Map/Set support, optimized array methods, and a new current() utility, while significantly improving TypeScript type definitions and documentation.

12 changes

immerjs/immer was measured the same way every project in this corpus was: the same rubric, at a pinned commit, with the result published in full. Point the surveyor at a repository you know and see whether you agree with it.