Immer

Description

Immutability Library

Overview

Immer (German for “always”) is a lightweight package that simplifies working with immutable state by employing a copy‑on‑write strategy.

How It Works

1. Draft State – You apply all changes to a temporary draftState, which acts as a proxy for the current state.
2. Mutation – While editing, you treat the draft like ordinary mutable data.
3. Final State – Once mutations are finished, Immer generates a new nextState derived from the modifications made to the draft.

This approach allows you to modify your data directly while preserving all the advantages of immutability.

Creator

Michel Weststrate
@mweststrate