immer

Allows writing state updates as if mutating objects directly, eliminating the need for manual spread operators or deep copies, as described in the key features for a mutable API.

Only copies the parts of the state that change, reducing memory usage and improving performance, which is highlighted in the structural sharing feature.

Provides full TypeScript support with excellent type inference, making development smoother and type-safe, as noted in the TypeScript support feature.

With a bundle size around 3KB gzipped and zero dependencies, it adds minimal overhead to projects, as emphasized in the tiny footprint feature.